User Manual

DBW Series

Single Isolate Regulate System

10-160KVA

1. Safety Guide 1

2. Descriptions 3 2.1 RELIABILITY AND QUALITY STANDARDS ............................................................... 3 2.2 DBW SERIES ............................................................................................................. 3 2.3 WARRANTY ............................................................................................................... 3 2.4 EXTENDED WARRANTY........................................................................................... 4

3. System analysis 3.1 MAIN CHARACTERISTICS. ....................................................................................... 5 3.2 PRINCIPLE OF WORK............................................................................................... 5 3.3 BASIC COMPONENTS AND CIRCUIT ...................................................................... 7 3.4 DBW SERIES ELECTRONIC AVR TECHNOLOGY SPECIFICATION ....................... 8

4. Installation 4.1 INTRODUCTION ........................................................................................................ 9

4.1.1 RECEIPT OF THE AVR ..................................................................................... 9 4.1.2 NAMEPLATE ..................................................................................................... 9

4.2 EQUIPMENT TRANSPORT AND STORAGE............................................................. 9 4.3 UNPACKING............................................................................................................. 10 4.4 POSITIONING .......................................................................................................... 10 4.5 CABLING.................................................................................................................. 13

4.5.1 PREPARATION FOR THE CABLE .................................................................. 13 4.5.2 EARTHING ...................................................................................................... 14 4.5.3 CONNECTING THE IN/OUTPUT CABLE........................................................ 15

5. Operation 17 5.1 COMMISSIONING.................................................................................................... 17

6. Maintenance 19 6.1 INTRODUCTION ...................................................................................................... 19 6.2 USER RESPONSIBILITIES...................................................................................... 19 6.3 ROUTINE MAINTENANCE....................................................................................... 19

7. Troubleshooting 20

Content

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Please keep the manual for reference. THIS Motor-regulator AVR MUST NOT BE STARTED UP OR PUT INTO USE WITHOUT HAVING BEEN COMMISSIONED BY A FULLY TRAINED AND AUTHORISED PERSON.

Regular professional electrician must do all maintenance work, DO NOT ATTEMPT TO SERVICE THE AVR YOURSELF. BY OPENING OR REMOVING THE AVR-COVERS YOU RUN RISK OF EXPOSURE TO DANGEROUS VOLTAGES!

IN CASE OF ANY KIND OF DOUBT REGARDING THIS AVR, PLEASE CONTACT:

LDC TECHNOLOGY INC

Tel. +86 532 87882666、87883999、87980999

Fax. +86 532 87885388

e-mail: LDCUPS@yahoo.com.cn

http:// www.LDC.com.cn

LDC ASSUME NEITHER RESPONSIBILITY NOR LIABILITY DUE TO INCORRECT OPERATION OR MANIPULATION OF THE Motor-regulator AVR. LDC Has taken every precaution to produce an accurate,

complete and easy to Understand manual and will

therefore assume neither responsibility nor liability for

Direct indirect or accidental personal or material damage

due to any misinterpetation Or undesired mistakes in this

manual. This manual may not be copied nor reproduced

prior to written permission of LDC.

1. Safety Guide

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2.1 Reliability and quality stantards

Congratulation on your purchase of the DBW series Motor-regulator AVR. The DBW series Electronic AVR will provide your critical equipment with a steady and reliable power supply for many years. LDC Technology INC is situated in California U.S.A and is specialized in the design and manufacture of Power products. The criteria and methods implemented at LDC for the design and manufacture correspond to the most stringent quality standards.

2.2 DBW series Electronic AVR

DBW series Motor-regulator AVR consists of two models: Standard: Standard Motor-Regulator, I/O non Isolation. Especial: Motor Isolation Regulator, I/O Isolation, customized as the User requirement.

2.3 WARRANTY

The DBW series Electronic AVR is supplied with a limited

warranty that the AVR and its Component parts are free from

defects in materials for a period of 12 months from The date of

original commissioning or 15 months from the date of original

delivery, whichever is the sooner. Transportation cost is not

included in the warranty and has to be paid by the end-user.

Do not return anything without written authorization from LDC or

your closest service centre. LDC or the closest service centre will

then give you further Instructions how to proceed. Any product

must be returned with transportation charges prepaid and must be

accompanied by a description of the failure. Products without

description will not be handled.

This warranty is invalidated if the AVR is put into use without

having been commissioned by a fully trained and by LDC

authorized person. This warranty does not apply to any damage or

losses caused by misuse, abuse, negligence, neglect,

2. Descriptions

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unauthorized repair or modification, incorrect installation,

inappropriate environment, accident, act of God or inappropriate

application. If the AVR fails to conform to the above within the

warranty period then LDC or an authorized service centre will, at its

sole option, repair or replace the AVR or parts of it. All repaired or

replaced parts will remain the property of LDC or of the authorized

service centre. LDC is not liable for any costs, such as loss of

profits or revenue, loss of equipment, loss of data or software, cost

of substitutes, claims by third parties or otherwise. As general

policy, LDC does not recommend the use of any of its products in

life support applications where failure or malfunction of the LDC

product can be reasonably expected to cause failure of the life

support device or to significantly.

Affect us safety or effectiveness. LDC does not recommend the

use of any of its products in direct patient care. LDC will not

knowingly sell its products for use in such applications unless it

receives in writing assurances satisfactory to LDC that the risks of

injury or damage have been minimized, the customer assumes all

such risks and the liability of LDC is adequately protected under

the circumstances.

2.4 EXTENDED WARRANTY

User can require that extend the WARRANTY, please contact with the closest agent if you want to know the details.

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3.1 Main Characteristics

The DBW series compensates power Regulator, is the new generation of power

Regulator of our company introduces the American technology, the union domestic

electrical network voltage actual situation, develops the development together after

this company Chinese and foreign technical personnel When outside power supply

electrical network voltage undulation or load fluctuation, uses this Regulator to be able

to keep the output voltage stability automatically.

This Regulator has the Characteristics of big capacity, the wide range, loses lowly

(is energy conservation), the high precision, the quick regulate voltage speed, non-

waveform distortion and so on;

This Regulator voltage regulation is steady, can withstand the instantaneous

overload, is suitable each kind of linearity, the non-linear load;

Because the human nature Chinese LCD, enable this Regulator to have of the

volume slightly, weight light, installs the use maintenance conveniently.

It can be used widely at the industry, agricultural, exchange, posts and

telecommunications, military, railroad, scientific research culture large-scale

electromechanical device, the metal working equipment, the production assembly line,

the architectural engineering equipment, the elevator, the medical instrument, the

printing packing equipment, the computer control device, situation and so on textile

printing equipment, as well as air conditioning, broadcast television, guesthouse and

domestic electric appliances illumination and so on, places that all need constant

voltages.

3.2 Work principle The DBW series Motor-Regulator AVR is composed by Isolation transformer,

Compensate transformer，Motor-Regulator transformer, , Contactor operation

circuit, the LCD and so on.

Electric principle Diagram as below:

3. System Analysis

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Cont r ol Sy s t em

Vol t age Regul at or

Compens at i on Tr ans f or mer

Ser vo mot or

LiN

LoN

Figure 1

Voltage regulator primary winding connected to the output of Regulator, the secondary

winding connect the primary winding of the compensation transformer, and the

secondary winding of compensation transformer is connected in series in the main

circuit.

Vol t age Regul at or

Compensat i on Tr ansf or mer

Ui Uo

Uc

Figure 2

If except the compensation transformer impedance pressure drop, as the second chart shows that： UO=UI+UC expressions： UI－－－ Regulator Input Voltage；

UO－－－Regulator Output Voltage；

UC－－－Regulator compensation voltage； The principle is: When the input voltage increases ΔUI in the UI, the

compensation voltage UC has been a corresponding change in voltage ΔUC, and UC =- UI, so that the output voltage UO remain unchanged. Its regulators process： In accordance with the output voltage changes, by the voltage

detection unit sampling, detect and output signal to control Servo Motor M rotation,

through the slowdown institutions and the chain led the brush Group slid (or scroll) to

regulate The secondary voltage of regulator transformer, to change the compensation

voltage polarity and size, to achieve Output automatic stability is during in the voltage

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regulator precision, in order to reach the automatic voltage regulator.

3.3 Components

（1）Compensation Transformer When the size and polarity of the Voltage in the Primary winding changes,

it can make Secondary winding that is connected in series on the road loop produce the compensation voltage transformer with amplitude and variable polarity.

（2）Isolation Transformer

Isolation transformer is used to isolate input and output winding each other on the electrical transformer, to prevent dangers accidental touching live body (or as a result of damage to the insulation and metal parts may be charged) and the earth at the same time.

（3）Voltage Regulator

Voltage Regulator is a three-phase autotransformer that can adjust the second voltage. It has two pairs brush that can slide symmetrical automatically. Servo motor driven brush by the chain along the winding-cylinder autotransformer of the exposed part of (the slide) slide, adjust the second voltage smoothly to achieve the change compensation voltage and maintain output voltage stability.

（4）Circuit switch devices and operation circuit Regulators in the main circuit set up a contactor and a changeover switch, set up for

the automatic voltage compensation system can easily input and exit and. Into Regulators running, as long as the change-over switch handle at 'REGULATOR' position, press the 'ON' button on the operation panel, AC contactor can be closed; needs AC direct, as long as the knife switch handle is on 'AC 'Location. (5) Voltage detection and regulation unit

Detect and regulate the sampling control transformer on the printed circuit boards, takes out the sampling voltage and control voltage from the voltage regulator output, through the transformer, rectifier, filter and regulator, the control voltage get the upper and lower limits voltage by the potentiometer. Through the voltage transformer, rectifier, the filter，Sampling voltage get the signal voltage that change follow with the output voltage into the comparator compared, when the output voltage changes over the accuracy permitted, the voltage detection will be issued instructions regulating the output voltage until the output voltage to return to precision tuning Permitted.

（6）The overshoot’s, protection device Voltage automatic compensation system set up the overshoot’s protection.

The overshoot’s protection composed by the limit switch, when the brush slide and hit

the both ends of the limit switch, the normal close contact disconnected, the servo

motor stopped.

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3.4 DBW Series MOTOR-REGULATOR AVR technology Specification

Type Rated Capacity

（KVA）

Output Current

（A）

Input Voltage

（V）

Output Voltage

（V）

Phase

No

Withstand

voltage

（V）

Insulated resistance

（MΩ）

Efficiency

Harmonic Distortion

Frequency(Hz)

Regulator precision

DBW-10 10 16 DBW-20 20 31 DBW-30 30 46 DBW-50 50 76 DBW-100 100 152 DBW-180 180 274 DBW-225 225 342 DBW-320 320 487 DBW-400 400 608 DBW-500 500 761 DBW-600 600 913 DBW-800 800 1217

DBW-1000 1000 1521 DBW-1200 1200 1825 DBW-1600 1600 2434

ⅠType

304~456

ⅡType

285~475

ⅢType

266~494

380V±5%

Adjustable

3 phase

2000V 1 minuteNon-Run

away

DBW-10 10 46 DBW-20 20 91 DBW-30 30 137 DBW-40 40 182 DBW-50 50 228 DBW-60 60 274 DBW-80 80 365 DBW-100 100 455 DBW-120 120 548 DBW-180 180 818 DBW-225 225 1013 DBW-300 300 1364

176~264 220±5%

Adjustable

Single phase

2000V 1minuteNon-Run

away

≥3 ≥99% Non 50~60 ±（1~5）%

Adjustable

Note: Because of company's R&D improvement unceasingly, so all specifications mentioned above are subjected to change without prior notice.

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4.1. INTRODUCTION

This section contains all the necessary information for the correct unpacking, stocking, positioning, cabling and installation of the DBW Series AVR.

ALL THE OPERATIONS IN THIS SECTION MUST BE

PERFORMED BY the LDC authorized person. Who is

professional engineering person. If don’t connect or

operation as this manual result in damage of person or

equipment. LDC wills no responsibility.

4.1.1 Receipt of the AVR

Received the AVR, please carefully check visually the packing

and the outlook of AVR whether any physical damage was

made during the transport. If damaged or doubt damaged,

Please inform immediately:

a) Freight Forwarder

b) LDC Corporation

Confirm whether the AVR received is identical to the description

of INVOICE.

The Packing of DBW Series AVR mainly protects AVR. Which

can’t be damaged by mechanism and environment. In order to

improve the protection level, AVR is packed in plastic film.

4.1.2 Nameplate

The main Technology Specifications of DBW Series AVR are all

written at the Nameplate in front of AVR. Check whether the

content of Nameplate is identical to the product you purchased. 4.2 Equipment transport and Storage

4. Installation

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After transportation, check equipment for damages that may have

occurred during the transport. The conveyance and your agency

must be notified in writing about the damages caused in transport,

including a detailed description of the visual defects. If you don’t

wish to install the equipment immediately, please observe the

following storage recommendations:

a). Store equipment in a vertical position in a well-conditioned room,

protected against humidity. Do not store the equipment in close

proximity to frequently used passageways and keep it away from

movable parts.

b). If the AVR system is already unpacked, please ensure storage

in a clean environment protected from dust.

4.3 Unpacking Carefully take off all the packaging material of the AVR, and then

pay attention to the arrow of the packaging.

Please unpack the packaging as follows.

Snip the packing tape, take off the packaging material upwards

Take off the plastic film on the surface of AVR

Keep the wrapper to be used for transportation in future

Check whether the AVR with any damage or not, if that Please

inform your transportation company or supplier immediately

Unpack the front door of the AVR, check the accessories as

packing list

Finally, check whether the specification of the AVR is identical

to the specification of your order. The key item in the specification

you must check is:

- RATED POWER OF THE AVR,

- INPUT VOLTAGE & FREQUENCY

- OUTPUT VOLTAGE & FREQUENCY

- NO. OF OUTPUT PHASES

4.4 Positioning The following precautions and recommendations should be

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checked in considering the site and environment of the AVR:

a) The AVR should be located on the place with adequate

ventilation (refer to the specification of the heat dissipation of the

AVR). If the AVR is installed indoors, care must be taken in insuring

the evacuation of heat from the closed room.

b) Adequate space (at least 1M) should be allowed to open the

door without obscured by other objects for operation or

maintenance. Adequate space (at least 1M) should be allowed

at the top of the AVR; because heat dissipation is ventilated

through the top openings (ventilation booth is available upon

request). And other sides of AVR no need allowed the space,

because it doesn’t include the dissipation holes in these sides.

So it can be arrange together with other AVR near these sides

to save pace.

c) Don’t put any objects on the top of the AVR to obscure the

ventilation. Don’t locate the AVR near to any heat source or the

other machinery, which produce metallic coil dust or powder, or

facility that will produce corrosive substances or vapor.

d) Don’t locate the AVR below the shower of fire extinguishing

system (In abnormal conditions, the AVR should be protected

by cutoff the power supply).

e) It is necessary to guarantee the temperature and humidity

values of the site into which the AVR will be installed should be

within the range allowed by the specification. The AVR is

capable of continuous normal operation within a temperature

range of -5℃(23℉) to 40℃(104℉). For optimal performance

and reliability to prolong the lifetime of AVR, it is recommended

to keep the environment temperature below 25℃, and humidity

below 80%.

f) If the AVR is installed outdoor, please avoid direct exposure of

the AVR to the sunlight or rain. Avoid direct confrontation with

sand, dust or wind.

g) The floor loading capacity should be big enough to endure the

weight of the AVR Four tough right angled steel foot stands are

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attached with the AVR, please insert the corresponding screw

nut into the floor for securing the AVR on the floor when it is

locate on territory where earthquake is expected or moving

vehicle, or tanker etc. These four nuts on the floor to secure the

AVR are shown below. 下。（10-80KVA AVR Fixed hole position

Drawing is single cabinet）

Fig 3.100-160KVA AVR Fixed hole position Drawing（double cabinet）

(h) The walls, the ceilings, the floors or anything near to the AVR

should be preferably constructed of non-combustible materials.

The portable fire extinguisher should be accessible nearby in case

of hazard.

(i) Avoid accumulating litter or trash of any sort in or around the

AVR system. The floor area surrounding the AVR should be

kept clean so that metallic powder and filings are not sucked

into the unit thus causing a short circuit and damage to the

system.

(j) Access to the AVR room should be limited to a minimum

number of operation and maintenance personnel only. The doors

should be kept locked and the keys should be confined to

authorized personnel only.

(k) Personnel who operate or maintain the AVR system should be

proficient in normal and emergency operational procedures.

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New personnel should be trained and qualified prior to operate

the equipment.

(l) Although the AVR has past the international EMC tests, it is not

recommended to install the AVR near to any equipment, which

is susceptible to electro-magnetic interference, such as the

computer system, the monitors or the radio etc.

(m) It is more preferable to place the AVR near to the source than

to the load.

4.5 Cabling

To ensure correct operation of the AVR and its ancillary equipment it

is necessary to provide the mains cables with appropriate fuse

protection. QUALIFIED INTERNAL PERSONNEL MUST PERFORM BY

AUTHORISED ELECTRICIANS OR ALL THE OPERATIONS IN

THIS MANUAL.

DO NOT OPERATE IN CASE OF PRESENCE OF WATER OR MOISTURE. BY OPENING OR REMOVING THE AVR-COVERS YOU RUN RISK OF EXPOSURE TO DANGEROUS VOLTAGES!

4.5.1 Preparation for the cable

Before you start connecting the AVR, ensure that:

MAINS VOLTAGE (INPUT VOLTS) AND FREQUENCY (FREQUENCY)

CORRESPOND TO THE VALUES INDICATED ON THE NAMEPLATE OF THE AVR.

EARTHING IS PERFORMED IN ACCORDANCE WITH THE PRESCRIBED IEC STANDARDS OR WITH LOCAL REGULATIONS;

AVR IS CONNECTED TO THE MAINS THROUGH A LV-DISTRIBUTION BOARD WITH A SEPARATE MAINS LINE (PROTECTED WITH ACIRCUIT BREAKER OR FUSE) FOR THE AVR

Provide input fuses and cables according to Figure 4-1 or in

accordance with the described IEC Standards or with the local

regulations.

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The AVR input must meet on circuit breaker or similar protective

device. The circuit breaker installs between AC and AVR, its

function is R provides the extra protection for AVR under the

situation of overloads and short-circuits.

The Fig as below only for reference, please follow the location

electrician law to make the finally decision.

Capacity INPUT

(Specification×QTY)UNIT：mm2 Output

(Specification×QTY)UNIT：mm2 Input/output earthing(Specification×

QTY)UNIT：mm2

(3φ) 6.0 10K

(1φ) 10.0 (1φ) 10.0 4.0

(3φ) 10.0 20K

(1φ) 25.0 (1φ) 25.0 6.0

(3φ) 16.0 30K

(1φ) 35.0 (1φ) 35.0 6.0

(3φ) 16.0 40K

(1φ) 50.0 (1φ) 50.0 6.0

(3φ) 25.0 60K

(1φ) 70.0 (1φ) 70.0 6.0

(3φ) 35.0 80K

(1φ) 95.0 (1φ) 95.0 6.0

(3φ) 35.0 100K (1φ) 100.0

(1φ) 100.0 6.0

(3φ) 50.0 120K

(1φ) 70.0×2 pieces (1φ) 70.0×2 pieces 6.0

(3φ) 70.0 160K

(1φ) 95.0×2 pieces (1φ) 95.0×2 pieces 6.0

Fig4-1 Cable Specification

4.5.2 Earthing

ALL THE OPERATIONS IN THIS SECTION MUST BE PERFORMED BY AUTHORISED ELECTRICIANS OR BY QUALIFIED TRAINED INTERNAL PERSONNEL.

To ensure protection of personnel during the installation of AVR make sure that The connections are performed under the following conditions: • No mains voltage is present;

• Loads are shut down and disconnected;

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• DBW series is shut down and voltage-free.

Connect the earthing wire coming from the LV-Distribution Board to the terminal "GND".

4.5.3 Connecting the in/output cable

After the AVR has been unpacked and brought to its final

position the authorized professional electrician can start to

connect the cabling.

ALL THE OPERATIONS IN THIS SECTION MUST BE PERFORMED BY AUTHORISED ELECTRICIANS OR BY QUALIFIED INTERNAL PERSONNEL

To ensure protection of the personnel during the installation of the AVR make sure that the connections are performed under the following conditions:

• NO mains voltage is present;

• All loads are shut down and disconnected;

• DBW series is shut down and voltage-free Remove the

terminal cover of the AVR;

Before connecting the input power cables make sure that:

• All the switches are open in position OFF.

Connect the input power cable coming from the LV-Distribution Board to the terminals of the AVR showed in the following pages.

I sol at i on Cabi net I nput

TIR TIT

Figure 4. 100-160KVA AVR isolation cabinet connecting terminal row

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Output N

TOR TON

Output L

GND

Figure 5. 100-160KVA AVR regulator cabinet connecting terminal row

TOR TON

Out put L

GNDTIR TIT

Wor k Power I nput

Out put N

Figure 6. 10-80KVA AVR isolation- regulator cabinet connecting terminal row

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5.1 Commissioning

The DBW Series AVR is a high quality electronic Equipment that must be commissioned by a fully trained and authorized LDC field service engineer before being put into use.

The commissioning of the AVR involves the connection of the AVR, the checking of the electrical installation and operating environment of the AVR, the controlled start-up and testing of the AVR and customer training.

Any AVR system not commissioned by a LDC field service engineer or authorized service centre must be considered an electrical hazard and LDC accepts no responsibility for its safe operation or the safety of any personnel. Additionally, the manufacturer’s warranty is immediately invalidated if the AVR is put into use before it has been correctly commissioned.

ALL THE OPERATIONS IN THIS SECTION MUST BE PERFORMED BY AUTHORISED ELECTRICIANS OR BY QUALIFIED INTERNAL PERSONNEL.

Before turn on any switch or breaker, check once again the

following points listed below:

(a) Check the input voltage if it conforms to the AVR’s rated

input voltage.

(b) Check the input frequency if it conforms to the AVR’s rated input

frequency.

(c) Check if all loads at the output are switched off.

(d) Check if all air switches are switched off.

(e) If there is anything not belongs to the AVR exits inside the AVR.

This procedure is only suitable for the AVR, 10~160KVA. Please refer to the brief instruction label stuck in front of

5. Operation

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the PCB holder.

Introduce how to turn on/off AVR now

(a) BYP SWITCH on “REGULATOR” place.

(b) Turn on INPUT SWITCH，regulator get power，key-press on

LCD “ON”，output relay closed, means that finished the Input

power electric experimentation.

(c) Index on the front panel, can see input voltage、frequency、

output voltage、output current and other related information,

key-press the “OFF” on the front panel will turn off regulator.

(d) BYP SWITCH on the “AC” Position, and closed the INPUT

SWITCH, Can get the ‘AC’ Output.

(e) The Auto / Manual switch on the front panel can choose

regulate mode.

(f) The Auto Changeover switch (on the front panel) can choose

to start-up mode.

(g) When you select manual regulator mode, key-press the

manually step-up voltage button on the front panel can

increase output voltage manually, key-press the manual

step-down voltage button on the front panel can low the

output voltage manually

(h) When the AC input but Bypass no output, the red warning

lights on the front panel.

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6.1 INTRODUCTION

ALL THE OPERATIONS IN THIS SECTION MUST BE PERFORMED BY AUTHORISED ELECTRICIANS OR BY QUALIFIED INTERNAL PERSONNEL.

To ensure an optimum operation of the DBW series AVR and a

continuous and efficient protection of the connected load it is

recommended to check the batteries Every 6 months, depending

on the ambiance temperature.

6.2 USER RESPONSIBILITIES There are no users serviceable parts contained within the AVR so the maintenance Responsibilities of the user are minimal. To maximize the useful working life and Reliability of the AVR and its batteries, the environment in which the AVR operates should be kept cool, dry, dust and vibration free. The batteries should be holding fully charged.

6.3 ROUTINE MAINTENANCE

The AVR is designed to receive regular preventative maintenance inspections. These preventative maintenance inspections are essential to ensure that both the useful working life and the reliability of the AVR are maximized.

Preventative maintenance inspections involve working inside the

AVR, which contains hazardous AC and DC voltages. Only LDC

trained or agreed service personnel and authorized field service

engineers are fully aware of all of the hazardous areas within the

AVR.

During a preventative maintenance inspection the field service engineer will carry out the following checks: • Site/environment conditions;

• Integrity of electrical installation; • Cooling airflow;

• Regulator operation and calibration;

• Load characteristics; • Integrity of alarm and monitoring systems;

• Operation of all installed options;

6. Maintenance

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NO Trouble Reason ACTION

1 Cannot Start-up

Input power-supply wiring mistake or electrical network abnormal

Built-in breaker open or damage

Exchanges two power wiring at will or inspects power line

Closing or replacing Breaker

2 Cannot Regulate Voltage

Voltage testing or adjust board damage

Mechanical system breakdown

Repair or the replacement

3 Voltage has not output

Voltage testing or adjust board damage

Output Relay damage Replacement

4 Frequently appears trips

Voltage testing or adjust board damage

Other protection function The specialist repairs

NOTE：

7. Troubleshooting

LDC Technology INC www.ldcups.com, www.ldctech.com

LDC Technology INC. USA 2010 BATSON AVE #252 Rowland Heights, CA 91748, USA

Tel: 001-626-8317086

Fax: 001-626-8563981

LDC Technology INC.UK 657 River Gardens North Feltham Trading Estate

Feltham Middlesex

LDC Technology INC.TSINGDAO

Fujiabu Industry Garden, Xifuzhen, Chengyang District, Qingdao P.R.China

Post code: 266106

Tel. +86 532 87882666、87883999

Fax. +86 532 87885388

E-mail: LDCUPS@yahoo.com.cn

Http:// www.LDC.com.cn