Driller's Console Chapter 4

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REFERENCE

REFERENCE DESCRIPTION

This document contains proprietary and confidential information which belongs to National Oilwell; it is loaned for limited purposes only and remains the property of National Oilwell. Reproduction, in whole or in part; or use of this design or distribution of this information to others is not permitted without the express written consent of National Oilwell. This document is to be returned to National Oilwell upon request and in any event upon completion of the use for which it was loaned. National Oilwell

National-Oilwell L.P. 1530 W. Sam Houston Pkwy. N Houston, Texas 77043 USA Phone +1 713 935 8000 Fax +1 713 935 8382

DOCUMENT NUMBER

20605-50

REV

M

Technical Manual

Driller’s Console

Document number 20605-50 Revision M

www.natoil.com 24 HOUR SERVICE (713) 935-8000

REVISION HISTORY

M 14.04.2005 Updated to New Template BKF Rev Date (dd.mm.yyyy) Reason for issue Prepared Checked Approved

CHANGE DESCRIPTION Revision Change Description

A Initial Release B Added Revision History page and Drawing Number in footer. Revise Figures 4-9 and 4-10. C Changed writeup and figures for Mud Pump. D Make text and formatting corrections. Update and revise Figure 4-1. E Change font size of note on page 4-1 and remove page break on page 4-2. F Update figures. G Add photo numbers and correct errors in text. H Convert to Word 97 format. J Minor formatting changes. K Minor formatting changes. L Add Table of Contents codes. Correct Level 5 and Level 6 styles and errors. M Update to new template.



TABLE OF CONTENTS 1 OPERATION..................................................................................................................... 4

1.1 Description.............................................................................................................. 4

1.2 Indicators and Controls........................................................................................... 6

1.3 Operating Instructions............................................................................................. 9

2 MAINTENANCE........................................ ...................................................................... 12

2.1 Installation ............................................................................................................ 12

2.2 Testing.................................................................................................................. 13

2.3 Servicing............................................................................................................... 16

3 TROUBLESHOOTING.................................... ................................................................ 18

3.1 Theory of Operation.............................................................................................. 20

4 REMOVAL & REPAIR ................................... ................................................................. 35

4.1 Driller's Console.................................................................................................... 35

4.2 DW Foot Throttle .................................................................................................. 35

4.3 Canadian Standards Association (CSA) ............................................................... 39



1 OPERATION

1.1 Description The Driller's Console is the primary control for the rig DC functions. It is installed on the drill floor near the Drawworks and contains an Assignment switch to apply power to various combinations of functions suitable for tripping or drilling. In addition, the Driller's Console houses a lockout switch and throttle for each function. Lights on the Driller's Console panel indicate the on-line status of the generators, SCR units, and auxiliary AC devices such as blowers, chain oilers, etc.

1.1.1 Specifications Refer to Table 4-1.

WHEN AN SCR IS ASSIGNED AND A FUNCTION SELECTOR ( SUCH AS MP1 OFF/ON) IS SELECTED, THE MOTOR(S) IS/ARE CONNECTED TO THE SCR DRIVE. THE MOTOR(S) MAY ROTATE EVEN THOUGH THE HAND THROTTLE IS IN THE FULL COUNTER-CLOCKWISE POSI TION. IF MOTOR ROTATION IS POTENTIALLY HARMFUL, PLACE THE FUNCTION SELECTOR TO OFF. THIS WILL DEASSIGN (DISCONNECT) THE MOTOR(S).

The Driller's Console is pressurized. The customer should provide a dry air bleed at 75 to 150 PSI.



Table 4-1. Driller’s Console Specifications

ELECTRICAL Electrical input The Driller’s Console does

not require an independent power supply. It receives these voltages from the other SCR Drive System units.

1. 115 VAC from the Generator Sync section.

2. ±14 VDC from each SCR Unit. 3. -14 VDC Contactor Power

Supply used to develop contactor control signals associated with each traction motor.

Output There are four outputs: 1. Zero to -8 VDC throttle

reference signals back to the SCR Units for each DC function.

2. -14 VDC contactor control signal for each traction motor.

3. -8.2 VDC supply for the DW Foot Throttle rheostat.

4. 120 VAC to MCC Relay Pan.

MECHANICAL Mechanical Console

The console is fabricated from 14-gauge stainless steel. The Speed Control handles are also stainless steel. The meters and lights are mounted behind reinforced glass. The assembly is watertight.

Size: 18 to 30" High x 36" Wide x 12" Deep

(46 to 74 cM High x 92 cM Wide x 31 cM Deep).

Weight: 130 to 200 Pounds (60 to 92 KG). DW Foot Throttle

The DW Foot Throttle is fabricated from No. 303 stainless steel plate. The Foot Throttle pedal is corrugated to provide a skid-proof footing. The assembly is watertight.

Size: 12.75" High x 12.75" Wide x 11" Deep

(32 cM High x 32 cM Wide x 28 cM Deep) maximum.

Weight: 30 Pounds (14 KG).



1.2 Indicators and Controls Figure 4-1 shows the various types of indicators and controls on a typical console. The numbers shown with parentheses in the following description indicate items on Figure 4-1. The GEN and SCR Status Lights (Items 3 and 4) illuminate when the corresponding units are connected to the Main AC Bus. The positions of the ASSIGNMENT Switch (Item 1) are arranged as the hours on a clock, with the vertical (12 O'clock) position being OFF.



Figure 4-1. Driller's Console Indicators and Contro ls

Item Description1. switch2. meter3. Status lights4. Status lights5. Status lights6. light7. ammeter8. switch9. switch

10. switch11. switch12. Hand Throttle hand wheel13. Drawworks Foot Throttle

ASSIGNMENTPOWER LIMITGENSCRBLWRPOWER LIMROTARY TABLEON-OFFEMERGENCY OFFFWD-OFF-REVRT LIMIT

1

10 10

12

13

11

8 8 9

3

4

5

6

DETAIL A



Positions on the left side of the ASSIGNMENT Switch (positions 7 through 11) are designed for tripping and those on the right side (positions 1 through 5) are intended for drilling. The Driller, however, is free to choose whichever is needed at any time. For each of these positions of the ASSIGNMENT Switch, the number in the blocks refer to the SCR units. The function it drives is listed below the number in the block. In DRILLING positions, DWA and DWB motors are connected in series (DWS). This provides full lifting capability, but only half the hoisting speed. On one SCR bridge in TRIPPING positions, the motors are connected to separate SCR bridges, giving full hoisting speed. The BLOWER Status lights (Item 5) are associated with auxiliary AC devices of the corresponding DC functions. For example, the DW BLOWER light illuminates when all auxiliary devices of both the Drawworks motors such as blowers and chain oilers are switched on. There are LOCKOUT Switches (Items 8 and 10) for each DC function. Once turned ON, the corresponding Hand Throttle wheel (Item 12 - there are four) is rotated clockwise to turn it from Zero to maximum speed. WHEN AN SCR IS ASSIGNED AND A FUNCTION SELECTOR ( SUCH AS MP1 OFF/ON) IS SELECTED, THE MOTOR(S) IS/ARE CONNECTED TO THE SCR DRIVE. THE MOTOR(S) MAY ROTATE EVEN THOUGH THE HAND THROTTLE IS IN THE FULL COUNTER-CLOCKWISE POSI TION. IF MOTOR ROTATION IS POTENTIALLY HARMFUL, PLACE THE FUNCTION SELECTOR TO OFF. THIS WILL DISCONNECT THE MOTOR(S).

1.2.1 Mechanical The Drawworks Foot Throttle pedal (Item 13) is pressed to operate the Drawworks once the DW Hand Throttle (Items 12) is rotated out of the OFF position. The RT ammeter (Item 7) indicates current drawn by the Rotary Table motor. This is an indication of developed torque. The RT LIMIT knob (Item 11) is rotated clockwise to increase the torque limit on the Rotary Table motor from 0 to 10. The POWER LIMIT meter (Item 2) indicates percentage of available total power capability of the generators and SCRs on line being consumed by the load. The POWER LIMIT light (Item 6) illuminates when the generators connected to the Main AC Bus approach (≈90%) their maximum capability.



The EMERGENCY OFF button (Item 9) is pressed to disconnect power to all DC functions in case of an emergency.

1.3 Operating Instructions

1.3.1 General Instructions 1. As a safety precaution, before proceeding any further, set the ASSIGNMENT

SWITCH to OFF and rotate all HAND THROTTLES to OFF.

2. If a shunt motor is to be run, make sure the field supply is ON.

3. Check the Generator Cubicle GEN RUN and ON LINE status lights to ensure there are sufficient generators connected to the Main AC Bus to fill the load requirement.

4. Check the SCR status lights to make sure the SCR units to be used are connected to the Main AC Bus.

5. On Propulsion or Winch systems, ensure that the SCR units to be used have been assigned to DRILLING at the Control Room Console.

6. Set the ASSIGNMENT SWITCH to the position desired.

7. Set the appropriate LOCKOUT SWITCH to ON, FWD, or REV, as desired.

8. The corresponding BLOWER Status Light will illuminate.

If all auxiliary motor starters are not closed, th e BLOWER Status Light will not illuminate.

DO NOT PROCEED ANY FURTHER IF THE LIGHT REMAINS UNILLUMINATED. TURN OFF THE THROTTLE AND TROUBLES HOOT THE SYSTEM.

9. Rotate the desired HAND THROTTLE (Items 12) clockwise to achieve the desired speed.

10. The POWER LIMIT Meter (Item 2) will indicate percentage of power consumed out of the total available from the generators connected to the Main AC Bus. The POWER LIMIT Light (Item 6) will illuminate when power consumption reaches ≈90%. In the interest of fuel economy, operate the rig between 90 to 95% of full power (as long as all functions are operating at desired speeds). Power Limit can be released by connecting additional generators to the Main AC Bus. If all available



generators are connected to the Main AC Bus and the POWER LIMIT Light illuminates, all the equipment will still run, though at reduced speed. Speed reduction is performed automatically by a Power Limit circuit to prevent overloading of the engine/generator sets.

11. When changing direction of Drawworks or Rotary Table from FORWARD to REVERSE (or vice versa), first turn the HAND THROTTLE (Items 12) completely counterclockwise to OFF. Let the motor come to a complete stop before switching the ON/OFF LOCKOUT Switch (Item 8) to the opposite direction. Otherwise, damage may result to the SCR unit as well as the Drawworks or Rotary Table.

1.3.2 Drawworks 1. Achieve cathead speed by performing the preceding General Instructions.

2. For a speedy tripping operation, depress the FOOT THROTTLE.

THE FOOT THROTTLE REMAINS INOPERATIVE UNTIL THE D W HAND THROTTLE IS MOVED OUT OF THE OFF POSITION.

3. After the tripping operation, slow the Drawworks to the HAND THROTTLE setting by removing pressure on the FOOT THROTTLE.

THE DRAWWORKS DYNAMIC BRAKE IS AUTOMATICALLY APPL IED WHEN THE FOOT THROTTLE IS RELEASED FOR MORE THAN TWO SECONDS.

THE DYNAMIC BRAKE MAY NOT SET IF THE HAND THROTTL E SETTING (CATHEAD SPEED) IS VERY HIGH.

1.3.3 Rotary Table 1. To turn on the Rotary Table, perform the preceding General Instructions.

2. Observe the RT AMMETER periodically to check the current drawn by the motor. The torque limit will not be exceeded if the RT LIMIT knob is set to match the pre-determined current limit even if pipe torque forces the Rotary Table to stall.

3. If the Rotary Table stalls, but more torque is required, the torque limit can be raised by rotating the RT LIMIT Knob clockwise.



DO NOT EXCEED THE CURRENT LIMIT SET FOR THE PRESENT OPERATION. IF THIS LIMIT IS REACHED AND THE ROTAR Y TABLE TORQUES UP AND STALLS, SLOWLY TURN THE RT LIMIT K NOB COUNTER-CLOCKWISE TO THE MINIMUM SETTING.

1.3.4 Mud Pump/Cement Pump 1. To turn on the Mud or Cement Pump, perform the preceding General Instructions.

Be sure to turn ON the Mud or Cement Pump LOCKOUT s witches.

2. For any maintenance activity, the pumps can be operated from the Mud or Cement Pump Console. The Driller's Console LOCKOUT switch must be switched on before either Pump Console can be operated.

The Mud and Cement Pump Console Hand Throttles can provide a maximum of only half speed.



2 MAINTENANCE Refer to Section 3 (SCR Unit) for general information regarding maintenance and testing of the SCR Unit. The following part of this section provides installation, testing, and servicing instructions specific to the Driller's Console.

2.1 Installation The Driller's Console is normally mounted on top of the pneumatic Drawworks Console. Cables to the Driller's Console are brought in underneath via connectors or stuffing tubes (refer to figure 4-1).

Figure 4-2. Driller's Console Cable Entry for Permanent Installation

Mobile rig units have connectors.

Place the Driller's Console on top of the pneumatic Drawworks Console and weld it around the edges. An alternate method is to bolt it down. If the bolt-it-down method is used, washers must be placed on the bolts so as to achieve an airtight seal.

2.1.1 DW Foot Throttle The Foot Throttle is flush mounted on the Drill Floor close to the Driller's Console. The cable from the Driller's Console should be strung below the Drill Floor.

TO DW FOOT THROTTLETO ROTARY TORQUE INDICATOR

DRY AIR BLEED



Refer to Figure 4-3. Cutout a 9.75" (25 cM) square section and drill four 0.562" (1.5 cM) clearance holes. Insert the ½-13 bolts (length of bolt is dependent on deck material) in the pedal place holes, then place the lower assembly in the cutout and fasten in place with the ½-13 bolts.

2.2 Testing Perform the functional test after repairing or replacing any of the console assemblies. If the unit fails to perform as indicated, refer to Troubleshooting later in this section to locate the malfunction. To test the Driller's Console, simply observe the operating instructions to run the motors in each Assignment switch position. Make sure the Blower lights turn on as indicated and the motor performance follows the throttle command. If it is not feasible to run the motors, observe the instructions listed in Table 4-2.



Figure 4-3. DW Foot Throttle Mounting Diagram

TOP VIEW RECOMMENDED CUTOUT

FOR FLUSH MOUNTING

UNLESS OTHERWISE SPECIFIED

DIMENSIONS ARE IN INCHES AND

TOLERANCES ARE:

.X = ± .10

.XX = ± .020

.XXX = ± .005

FRACTIONS ±

ANGULAR ±

½ -13 WELDNUT BELOW DECK - (4 REQ'D)

.562 CLEARANCE HOLE - (4 REQ'D)

9.75 - CUTOUT

9.75 CUTOUT

10.75 MOUNTING CENTERS

4.88

4.885.38

1.0012.75

12.75

1.005.38



Table 4-2. Driller's Console Functional Test

ACTION RESULT

1. Open all SCR Circuit Breakers.

The Circuit Breaker may be a switch.

1. This prevents SCR Bridge phase up when the assignment contactors are closed.

2. Jumper the auxiliary contacts of the SCR #1 switch (CB). Place the jumper between TB8-4 to TB8-5 in the SCR #1 Cubicle.

2. This enables assignment contactors to be closed in SCR #1 for the function being tested. The green SCR ON lamp on the Drillers console will illuminate.

3. On the ASSIGNMENT Switch, select a function to be tested (for example, MP1 may be run on SCR #1 in the ASSIGNMENT switch’s 2 o’clock position by rotating the ASSIGNMENT switch to the 2 O’CLOCK position and turning the MP1 OFF-ON switch to ON.

3. In the example, the MP1 contactors will pick up, the blowers on Mud Pump motors of MP1 will run, the auxiliary functions (Rod Oiler, Chain Oiler, etc.) will operate and the MP1 BLOWER ON lamp on the Drillers Console will illuminate.

4. Rotate the MP1 HAND THROTTLE fully clockwise while observing the throttle voltage variation.

4. Monitor the throttle voltage variation at MP1 INPUT (pin 125) on the DC Control Module. Measure it in respect to ground. It should be Zero VDC when the MP1 HAND THROTTLE is fully counter-clockwise (minimum) and increase to -8 VDC as it is rotated fully clockwise (maximum).

5. Repeat Steps 2 through 4 of this functional test for each SCR and each function powered by the SCR system. Remember to move the jumper for the auxiliary contacts of the SCR switch to TB8-4 and TB8-5 of the SCR being tested.

Refer to the control logic diagrams in the SCR System Print Book to identify the DC Control Module numbers for the desired test functions.

6. Verify the Drawworks Foot Throttle operation. Make this check for each SCR. Jumper TB8-4 to TB8-5 in only one SCR at a time.

6. Monitor for Drawworks Foot Throttle voltage on the pin 114 of the DC Control Module as the Foot Throttle is slowly depressed. The voltage will vary from Zero VDC when the Foot Throttle is not depressed to -8 VDC as the Foot Throttle is fully depressed.

7. Remove the jumper from the SCR switch (CB) auxiliary contacts. Close the SCR switch (CB) to prepare the SCR to become operational.

7. There is no measurable result from this functional test action.



2.3 Servicing Refer to Section 3 (SCR Unit) for general servicing instructions.

2.3.1 Console 1. Examine the internal assemblies periodically for signs of corrosion. Corrosion is

possible if the front panel door is not properly sealed or if the air or purge air is bringing in a large quantity of moisture.

2. Rotate the hand wheels and the switches and examine the switch and rheostat assemblies behind the Driller's Console door panel. Check the switch contacts and rheostat wiper arms carefully. Test the rheostat linkage for tightness.

2.3.2 DW Foot Throttle Perform the following service on the Foot Throttle every three months under normal conditions. 1. Remove the Foot Throttle (refer to Figure 4-4) and open the rear dust cover.

2. Check and re-tighten the set screws. Ensure that the Foot Throttle potentiometer returns to zero.

3. Check that the rheostat wiper does not rub the wires entering the Foot Throttle.

4. Grease the bearing surfaces.

5. Reassemble carefully to ensure that the Foot Throttle box is watertight.



Figure 4-4. DW Foot Throttle

REAR VIEW

TOP VIEW

8.10

12.75

12.75

RIGHT SIDE VIEW



3 TROUBLESHOOTING Refer to Table 4-3. The Theory of Operation which follows Table 4-3 provides an explanation of the various circuits in the Driller's Console.



Table 4-3. Driller's Console Troubleshooting

PROBLEM AND POSSIBLE CAUSE

ACTION

MOTOR WILL NOT RUN

A. Generator SCR units may be OFF.

A. Check the STATUS LIGHTS .

B. If motors are shunt-type, the field current may be zero.

B. Check that the Field Supply is ON and that the FIELD CURRENT AMMETER reading is ≈50 Amps.

C. Assignment contactors may have not picked up.

C. If the appropriate assignment contactors have not closed, trace the -14 VDC contactor logic signal through the appropriate assignment logic. Refer to Figure 4-7 (Driller's Console Schematic Diagram Shunt Motor System).

D. The HAND THROTTLE signal is not reaching the DC Control Module.

D. The HAND THROTTLE reference signal should be between Zero and -1 VDC at OFF and up to -8 VDC at MAXIMUM throttle. Check the signal at the selected SCR unit TB. Trace the direction in which the signal is absent.

E. The DYNAMIC BRAKE is ON if DRAWWORKS is selected and the HAND THROTTLE is set for CAT HEAD SPEED .

E. Either the B motor is leading the A motor OR the A motor DC Control Module is defective.

HORN SOUNDS

A. The DRILLER’S CONSOLE is no longer pressurized.

A. Check the dry air bleed for leakage.

B. The blower has not switched on, or fails to start running.

B. Trace the 115 VAC motor control logic.

FOOT THROTTLE DOES NOT WORK

A. The Foot Throttle rheostat is inoperative.

A. Check the reference signal at pin 114 of the selected SCR unit DC Control Module. Check for presence of the -8.2 VDC at TB9 in the DRILLER'S CONSOLE . Trace the signal in the direction that it is absent.

B. Loose set screws on one of the rheostat shafts.

B. Use Locktite solution on all screws inside the throttle. Use a thin 3/8" jam nut on the rheostat bushing.

C. The Foot Throttle may be frozen.

C. The drain hole must be kept clear. If this is not done, the Foot Throttle unit may fill with water and freeze.



3.1 Theory of Operation

3.1.1 Console Mechanical To permit operation in an explosion hazard area, the Driller's Console electrical assemblies are isolated from the local atmosphere by maintaining a positive pressure within the Driller's Console enclosure. This prevents an electrical spark from igniting what could be explosive gas on the drill floor. The Driller's Console is also watertight. The customer is required to supply dry air at 75 to 150 PSI via a connector located underneath the Driller's Console. An Air Pressure Sensor triggers an alarm in the Driller's Console if positive pressure is lost. Electrical

The following description describes a Drive System with three generators and four SCR units. Refer to the diagrams in this section as a study aid. The SCR Schematics Manual has the diagrams appropriate to your rig. Figure 4-5 shows the Assignment Switch position labeling and the corresponding wiring of a typical Driller's Console. The Driller's Console receives the -14 VDC contactor power supply signals from each SCR unit from which the throttle power supply is generated. It returns those power signals to the appropriate throttle and contactor signals. Figure 4-6 indicates the wiring for a typical SCR 2. Note that SCR 2 can operate the RT, DW A, and MP 1. Contactor and throttle lines for only these functions are wired. The AC Section provides 115 VAC power and control signals which turn on the GEN STATUS lights. The MCC provides control signals which turn on the BLOWER STATUS lights.



MCC

TB9TB6TB5TB4TB3TB2

TB1

TB1

TB1TB6TB6TB6TB6

DW FOOTTHROTTLE

DRILLER'S CONSOLE

AC SECTIONSCR 4SCR 3SCR 2SCR 1 MCC

ASSIGNMENT SWITCH

MP2DWA

OFF

1211

SCR2 SCR3 SCR4

10MP1 DWA

DWADWB 9

MP2 DWA 8 4 MP1 MP2 DWA

3 MP2DWAMP1

MP1 MP22

1 MP2DWS

5 MP2-DWS

SCR1 SCR2 SCR3 SCR4

DWB

MP1

DWB

DWB

SCR1

RTPS

RTPS

RTPS

RTTD

RTPS

RTPS

RTPS

RTPS

RTPSMP1

DWS

Figure 4-5. Typical Driller's Console Cabling Diag ram

Docum

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20605-50 R

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age 22

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w.natoil.com

24 H

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-14 VDC

TB6

TB2

DRILLER'SCONSOLETB2

SCR 2

ASSIGNMENTCONTACTORS

SCR 2

I2

IFDBCK

+14 VDC

PCI

CB AUXILIARY

CP CONT

IFDBCK

MANUAL SW

ON

OFF134

154

131

153

SCR 2DC MODULE

117

114

128

130

126

125

123

122

118

119

110

113

129

124

121

120

116

112

ASSIGNMENTSWITCH

DW SPD REF

DW FT TH

RT I LIM

RT REF 1

MP1 REF MPC

MP1 REF DC

MP2 REF MPC

MP2 REF DC

P REF ERC

P REF WHC

CP REF 2

CP REF 1

RT CONT

MP1 CONT

MP2 CONT

P CONT

DW CONT

CONTACTOR PS

ASSIGNMENT SWITCH

MP2DWA

OFF

1211

SCR2 SCR3 SCR4

10MP1 DWA

DWADWB 9

MP2 DWA 8 4 MP1 MP2 DWA

3 MP2DWAMP1

MP1 MP22

1 MP2DWS

5 MP2-DWS

SCR1 SCR2 SCR3 SCR4

DWB

MP1

DWB

DWB

SCR1

RTPS

RTPS

RTPS

RTTD

RTPS

RTPS

RTPS

RTPS

RTPSMP1

DWS

Figure 4-6. S

CR

2 Wiring of T

ypical Driller's C

onsole



Figure 4-7 shows the circuits which are enabled when the ASSIGNMENT switch is set to the 10 o'clock position to run Mud Pump 1 on SCR 2. It does not matter which generator is connected to the Main AC Bus. Further, the Mud Pump 1 ON/OFF switch is set to ON and the Mud Pump 1 HAND THROTTLE is rotated to provide the desired number of strokes from the mud pump. Assignment Logic

Assignment logic enables a -14 VDC signal (see Figure 4-7) which originates in the DC Control Module at Pin 154. The -14 VDC signal is returned to the SCR Cubicle to close the appropriate ASSIGNMENT contactors and then sent to the DC Control Module to unlock the SCR Firing Circuits. The -14 VDC signal is first passed through the normally closed MANUAL VOLTS switch. The MANUAL VOLTS switch is turned on for testing purposes to phase up the SCR bridge without running a motor. The -14 VDC signal emerges at Pin 134 as Contactor Power Supply (CONT PS). It is a part of the 74 VDC contactor voltage: -14 VDC at Pin 154 and +60 VDC at PC1-41, see Figure 4-7. The -14 VDC CONT PS is then passed through the normally-open auxiliary contacts of the SCR switch. The -14 VDC CONT PS is enabled when the SCR switch is closed (this feeds AC power to the rectifier bridge). -14 VDC CONT PS is applied to TB6-2 and from there is supplied to the Driller's Console TB2-2 via a control cable. The SCR 2 -14 VD C CONT PS is applied to ASSIGNMENT switch contacts C1 and C10. Mud Pump 1 can be powered by either SCR 1 or SCR 2 . Mud Pump 2 can be powered by either SCR 3 or SCR 4.

-14 VDC CONT PS also causes L7, the green SCR 2 ON lamp located on the Driller's Console to illuminate. The ASSIGNMENT switch (refer to Figure 4-8) consis ts of eight decks. The first deck is labeled A, the second B, then C, D, E, F, G, and H. They are divided into four adjacent deck pairs (A and B, C and D, E and F, G and H). Each deck pair makes a switch having 12 terminals. Contact is made by a roller between the terminals of the adjacent deck pairs. For instance, if the ASSIGNMENT switch is set at the 2 O'clock position, A2 contacts B2, C2 conta cts D2, etc.

When the ASSIGNMENT switch is set to the 10 O'clock position, the -14 VDC CONT PS is conducted from ASSIGNMENT switch contact C10 to D10, passing power to the contacts of S2, the MP1 ON/OFF switch (this switch also controls the blowers on the MP1 traction motors). From S2, the power travels to TB2-5 and then down the control cable to TB6-5.



The next contacts in the circuit shown in Figure 4-7 are on the Sprocket Slip Card and are between PC5-16 and PC5-19. These contacts are shown in Figure 4-7 as normally opened. They, however, are closed when power is applied. The Sprocket Slip Card prevents traction motor overspeed, should one of the DC motors be unloaded. On some systems, there are provisions for locking out the Mud Pump. Refer to your system prints to see if this provision applie s to your system.



Figure 4-7. Typical Mud Pump 1 and 2 Control Schema tic



Figure 4-8. Rear View of Assignment Switch

-14 VDC CONT PS now goes through the normally-closed SAFETY INTERLOCK CONTACTS (the Draw Works A (K6) and Rotary Table (K4) power contactors). The -14 VDC of CONT PS is now present on the left side of the Mud Pump power contactors K2 and K7. Since there is now 74 VDC across K2 and K7, they will pick up and connect the traction motors to the SCR bridge. K2 and K7's normally-open auxiliary contacts are now closed to bring -14 VDC CONT PS onto Pin 124 of the DC Control Module. At this time, CONT PS is renamed the CONTACTOR SIGNAL . The -14 VDC CONTACTOR SIGNAL will turn off the Inhibit Circuit of the DC Module if the Mud Pump 1 Hand Throttle is at it's full CCW position. The Mud Pump Throttle Reference Signal

In Figure 4-9, the Mud Pump 1 Throttle Assembly consists of two ganged (mechanically connected) rheostats. The front rheostat's output is supplied to Pin 125 of SCR 1's DC Control Module. The rear rheostat's output is supplied to Pin 125 of SCR 2's DC Control Module. The Mud Pump Throttle Reference signal is active when the Mud Pump Throttle is rotated enough to produce ≈-1 VDC to the DC Control Module. This 0 to ≈-1 VDC is called the DEADBAND REGION .



The Deadband Region has two important purposes:

1. The output of the Mud Pump Throttle does not have to reach Zero Volts for the motor to stop rotating.

2. It permits the Charging Pump to be started before the Mud Pump begins to run.

Throttle Logic

The Throttle Hand Wheel is linked to a rheostat which outputs a Zero to -8.2 VDC signal. This corresponds to Zero through maximum throttle. The -8.2 VDC supply for the rheostat is developed on the Driller's Console PCB (refer to Figure 4-10) from the -14 VDC from each SCR unit.



Figure 4-9. Typical Mud Pump 1 & 2 Reference Schema tic



Figure 4-10. Driller's Console PCB Circuit



The -14 VDC input is dropped through five Watt 82Ω resistors and applied to 8.2 Volt Zener diodes. The voltage across a Zener diode is constant even though the incoming voltage may vary. The regulated -8.2 VDC is applied to the hand throttle, foot throttle and RTI (torque) Limit rheostats. The Throttle Hand Wheel rheostats for each function are gang-mounted (moving the throttle hand wheel rotates the wiper of each rheostat the same number of degrees). The reference signal from each Throttle Hand Wheel rheostat is applied to all the SCR units that are capable of powering the same motors. This assures that there will be little change in the motor performance (e.g., if Mud Pump 1 is switched from SCR1 to SCR2). A micro-switch is linked to each Throttle Hand Wheel. The micro-switch contacts are closed when the Throttle Hand Wheel is rotated. The micro-switches control the logic for the auxiliary functions. Blower Lights Logic

There is one blower light associated with each DC function. The light illuminates when all associated AC functions are switched on. Refer to figure 4-11. Observe that the MP1 BLOWER light cannot turn on until the MP1A BLOWER , MP1B BLOWER , the MP1 ROD OILER, and the MP1 CHAIN OILER are switched on. The blower lights operate off 115 VAC from the Generator section. The relays which switch on the AC functions are located in the MCC (Motor Control Center Section). A relay is energized when ON/OFF switch MP1 is closed. The normally-open contacts of MP1 close to switch on power to the AC functions listed in the previous paragraph.



Figure 4-11. Driller's Console AC Circuits



In similar fashion, MP2 logic is enabled by the MP2 ON/OFF switch. The Drawworks and Rotary Table blowers are enabled by their respective OFF/ON switches. The blower for the Drawworks or Rotary Table may b e configured to run for two to five seconds before the throttle can be rai sed to start the traction motor. If this has been done on your equipment, it was to comply with an ABS (American Bureau of Shipping) rule which requires a drill floor motor to be purged of existing air before operation.

Alarm Horn Logic

The alarm will sound if either the positive pressurization within the Driller's Console is lost OR the blower is not switched on. The normally-closed air pressure switch stays closed to trigger the alarm if the pressure drops below two inches of water difference between the pressure inside the Driller's Console and outside pressure. The alarm is also triggered if the normally-closed blower contact does not open when motor starter picks up. Power Limit Light

The Power Limit Light illuminates to indicate that the generators connected to the Main AC Bus are close to power limit. Contactor K1 on the Power Limit board closes to feed 115 VAC to the light. Refer to the Power Limit theory of operation in Section 2 of this manual. DW/RT Interlock

On some rigs, the motor is used to drive either the Drawworks or the Rotary Table through a chain drive. A gear box is used to shift the chain drive between the two functions. A normally-closed contact of the Rotary Table relay is part of the DW CONT logic. Thus, the interlock circuit enables the DW CONT signal and disables the RT CONT signal. This situation is reversed when the Rotary Table Throttle Hand Wheel is rotated clockwise. The micro-switch closes and, in turn, energizes the RT relay. Consequently, the DW CONT signal is disabled and the RT CONT signal is enabled.



3.1.2 DW Foot Throttle Mechanical

Refer back to Figure 4-4 for front and side views of the DW Foot Throttle. The pedal of the DW Foot Throttle is linked through a spring to a counterweight. Thus, it will return to the un-depressed position when released. Electrical

The incoming -8.2 VDC signal is enabled when the Draw Works micro-switch is closed. Therefore, the DW Foot Throttle becomes operational only after the Drawworks Throttle Hand Wheel is set beyond the OFF position. Figure 4-12 depicts the Foot Throttle circuit. The pedal arm of the Foot Throttle is linked to the rheostat wiper arm. The resulting DW FT TH signal varies from Zero to -8 VDC. This equates to Zero to maximum throttle.



Figure 4-12. Drawworks Foot Throttle Circuit

DW FOOT THROTTLE

GREEN

DRILLER'S CONSOLE

GROUND

(SCR 4) DW FT TH

- 8.2V

TB4

3

2

1

TB9

(SCR 1) DW FT TH

3-CONDUCTOR CABLE

20

12

TB1

WHITE10

DW-MSWRED

10

PC 1



4 REMOVAL & REPAIR

4.1 Driller's Console To access the Driller's Console assemblies, open the front panel door by unlocking the latches. Figure 4-13 shows these assemblies.

BEFORE DISCONNECTING, MARK EACH CABLE WITH THE CORRESPONDING TERMINAL BOARD NUMBER.

4.2 DW Foot Throttle Release the four ½-16 bolts located in the corners of the Driller's Console Foot Throttle pedal assembly and lift it out. To access the Foot Throttle rheostat, remove the rear dust cover by releasing the four corner screws (see Figure 4-14). Refer to Table 4-4 for the parts list.



Figure 4-13. Driller’s Console Assemblies

A. Door View

B. Compartment View



Figure 4-14. DW Foot Throttle Assembly



Table 4-4. Draw Works Foot Throttle Assembly Compon ents (reference 11467-38 Rev. H)

ITEM QTY PART NUMBER DESCRIPTION

1 1 0001-1467-37 ENCL-FOOT THTL

2 1 0001-1467-36 PEDAL-FOOT THROTTLE

3 1 0001-1467-22 PLATE-INSP,FOOT PEDAL

4 1 1704-1130-01 ACTUATOR-BAR ASSY

5 1 1704-1130-02 PIN-PEDAL PIVOT

6 1 1704-1130-03 PIN-PIVOT,CONNECTING ROD

7 2 1704-1130-04 BLOCK-CONNECTING ROD END

8 1 1704-1130-06 CONNECTING ROD

9 2 1704-1130-07 BLOCK-PEDAL BEARING

10 1 1704-1130-08 BLOCK-COUNTERBALANCE BEARING

11 1 1704-1130-09 SCREW-SHOULDER

12 1 1704-1130-10 DAMPER-NEOPRENE & STL WASHERS

13 1 0002-0394-00 NUT-1/2-20,HEX HD,S/S,W/COTTER PIN HOLE

14 2 1704-1130-12 SPACER-DELRIN

15 2 1704-2159-01 SPRING-TORSION

16 1 1704-1641-01 COLLAR-SET SCREW,THTL SHFT

18 4 3101-2118-02 BOLT-3/8-16 X 1.50,HEX HD

19 2 3101-1920-02 BOLT-1/4-20 X 2.00,FLT HD CSK

20 4 3101-1917-04 BOLT-1/4-20 X 1.25.FLT HD CSK

21 4 3111-2101-01 NUT-3/8-16,ESNA NUT,S/S

22 6 3111-1901-01 NUT-1/4-20,ESNA NUT,S/S NYLON

23 3 3101-1906-04 SETSCREW-1/4-20 X 0.38,S/S HEX

24 2 3115-1718-01 PIN-COTTER,1/8 X 1.50,S/S

25 4 3101-1108-02 SCREW-#10-32 X 0.50,BINDING HD

26 1 3101-0904-00 SETSCREW-#8-32 X 0.50,S/S,HEX

27 1 3112-2315-01 WASHER-WAVE SPR,.53 ID X .73 OD

28 1 3112-2708-03 WASHER-FLAT,1/2,STD PLAIN,S/S

29 1 1103-0008-00 TERM TUBE-BRASS,0.50”

30 1 0506-0003-00 RHEOSTAT- 200 OHM,90 DEG

31 1 0602-0013-00 FITTING-BULKHEAD ADAPTER,0.25”

32 2 0000-6817-99 BEARING-0.75” BORE,1-5/8 X 7/16 WD

33 2 0603-0015-00 BEARING-ADB8VNEW

34 1 0603-0003-00 BEARING-FS160,S/S

36 20 1104-0005-00 CABLE-3COND,16AWG,600V

37 1 0001-0256-77 PLUG-AIR INLET

38 2 3151-0701-00 GSKT-CLSD CELL,1/8” X 1” NEOPRENE

39 1 0001-0027-63 ANGLE-RHEOSTAT MTG

40 1 1103-0014-00 TERM TUBE-LOCKNUTS,0.50” BRASS

41 1 3101-0917-03 SCREW-#8-32 X 1.25,RND HD

42 1 3112-0907-01 WASHER-LOCK,#8,HELICAL SPLIT

43 4 3112-1108-02 WASHER-FLAT,#10,STD PLAIN

44 4 3112-1107-01 WASHER-LOCK,#10,HELICAL SPLIT

45 1 0000-6819-74 NUT-3/8-32,JAM NUT,S/S

46 4 1704-1130-14 SPACER-BEARING BLOCK

47 2 1704-1130-15 SHIELD FLINGER

50 1 0601-4238-01 N/P-ID,CONSOLE,MDL 201

51 4 3101-0503-01 SCREW-#4-40 X 0.19,PAN HD



4.3 Canadian Standards Association (CSA) Compliance with CSA Approval/Listing of Model 425 Driller's Console for use in Class I, Division II, Groups C & D Hazardous Atmosphere Locations.

4.3.1 Air Purge Alarm System The Air Purge Alarm System must comply with NFPA-496 Rules for Type Z Purging as interpreted by CSA. The changes required to do this are: 1. Delete the Alarm Silence toggle switch, or replace with a CSA Approved self

resetting Alarm Silence switch.

2. Delete the Supply Line pressure switch.

3. Increase the orifice diameter to 0.161" (#20 Drill Bit) to provide 5.0 SCFM (cubic feet per minute at specified conditions of temperature and pressure) flow at 50 PSI.

4. Install a DWYER-brand pressure switch (Ross Hill #0403-0081-00) complete with connection to atmosphere.

If PYLE-NATIONAL-brand multi-pole connectors are installed on the Driller's Console, the cautionary nameplate in Figure 4-15 must be mounted on the Driller's Console.

All Driller's Consoles with a CSA label affixed ha ve been manufactured to comply with CSA requirements.

4.3.2 Implementation This is to be done by compliance with all of the following:

1. Implement for all Driller's Consoles shipped to Canada or for eventual Canadian

use:

2. Implement for all Driller's Consoles shipped after April 15, 1980.

3. Do not retrofit unless required by regulatory bodies.



4. Implementation at any location other than the Ross Hill manufacturing plant, 1530 West Belt North, Houston, Texas 77043, violates CSA Agreements.

AVERTISSEMENT

0601-4173-01B

LR 34415

WARNINGMULTI-POLE CONNECTORS ARE FOR INSTALLA-TION PURPOSES ONLY. DO NOT DISCONNECTUNLESS AREA IS KNOWN TO BE NON-HAZAR-DOUS AND ALL CIRCUITS ARE DE-ENERGIZED.

CONNECTEURS MULTIPOLAIRES CONVENANTUNIQUEMENT POUR L'INSTALLATION. S'ASSUR-ER QUE L'EMPLACEMENT N'EST PAS DANGER-EUX ET QUE TOUS LES CIRCUITS SONTDESAMORCES AVANT DE DEBRANCHER.



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Driller's Console Chapter 4

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