wdb operation manual

8/2/2019 WDB Operation Manual

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—— Instructions —— WDB Series Microcomputer-monitored motor protector

Zhejiang Kuixing Electrical Co., Ltd. Tel: 0577-64700611 64701518 Fax: 64758918

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Company Profile

Founded in 1979, Zhejiang Kuixing Electrical Co., Ltd. (also Cangnan Automated Instrument General Plant) is an integrated

corporation engaging in research, production and sales of electrical products. The Company sits at the boundary of Zhejiang and

Fujian, by the shore of East China Sea and aside National Highway 104, very advantageous in geographical location and convenient

in transportation. Over more than 20 years, the Company has established a close cooperation relationship with several institutes and

colleges, including Design and Research Institute of Electric Drive - Tianjin, Zhejiang University, No.753 Institutes of China State

Shipbuilding Corporation and Fenghua Research Institute of Computer, to make innovations together. To date, a high-tech

development team centered on state-level researchers and senior engineers has been formed in the Company, and the technical

personnel take up 42.5% of total employees. The Company now is turning into a knowledge-intensive enterprise and is producing

high-tech products.

The main products of the Company include intelligent LV motor protector, M&C device for integrated motor protection,

MV/HV integrated microcomputer-protected M&C device, multifunctional voltameter and DC breaker ampere-time characteristic

products, which are widely applied in industries such as petroleum, chemicals, electrical, metallurgy, coal, light industry, municipal

construction and textile. Full automation in production and intelligent management are realized. And the Company is spreading its

reputation among the Chinese customers.

Products that have to comply with China Compulsory Certification (CCC) are in compliance with requirements of CCC, and

those outside the range of CCC are identified and certified by state and provincial departments and institutes. The Company has been

awarded with certificate of ISO9001 Quality System; as such quality management is standardized.

The Company advocates a business philosophy of “unity, innovation, high-efficiency and integrity”, and a business objective of

“survival by quality, development through science and technology, making profit through management, and all serving for users”.

“Your satisfaction is our commitment”. Kuixing Electrical sincerely welcomes all customers, old and new, to share opinion on

development. Let’s create a bright future together.





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1. General

WDB series microcomputer-monitored motor protector, a new generation intelligent integrated device for protection,

monitoring and control of LV asynchronous motor and increased-safety motor, is applicable in AC380V, AC660V LV system. In

addition to advanced motor protective and monitoring functions, this protector also provides major information such as records of operation and trip, and nominal parameters, and it is designed in a fieldbus structure, greatly facilitating the modern equipment

management. It has a vast application in industries such as petroleum, chemicals, electrical, metallurgy, coal, light industry, municipal

construction and textile.

Comply with the following standards: GB3836.3-200, GB14048.4-2003, IEC255

2. Characteristics

“tE time protection” complies with Chinese national standard (GB3836.3-2000) for protection of overload in

increased-safety explosion-proof motor;

AC sampling, measurement of current in A, B and C phases and voltage of control circuit

On-site display of operational conditions of motor, and storage of three records of motor tripping resulted from fault

One for protection output, one for self-defined relay output, and another for 4-20 mA current output or RS485

interface

HD wide-temperature crystal display to display promptly based on the operational conditions of motor and user’s

requirements, with background lighting

Selectable functions of realizing protection over unbalance of three-phase current, phase loss, overvoltage,

undervoltage and self start-up

E2PROM memory technology capable of maintaining the parameters even in power failure once set; do not need to

set again

Use of RS485 communication bus; a vast application in monitoring systems as an intelligent monitoring unit with

motor protection and control functions

Multiple purposes that can serve as ammeter, voltmeter, thermorelay, current transformer, time relay and leakage

relay.

3. Main functions

Protection:

Protection over faults such as overcurrent, locked rotor, phase loss, unbalance of three-phase current, overvoltage, undervoltage,

short-circuit, leakage(optional)

Measurement:

Measurement of current of three phases and voltage of control circuit, and display

General function:

Applicable for protection of increased-safety motor, three-phase asynchronous motor and feeder line

Communications:

Communications with upstream system is realized via RS485 interface of the protector. The bus interface supinterfaces

parameters setting, control and monitoring, as well as Modbus communications protocol. Usually, an RS485 bus interface is for

physical connection. And generally, an upper computer or a PLC device serves as the master station, and this protection serves as

substation.

Current output:

4-20mA current output; and current value corresponding to 20mA settable.





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4. Model description

Example:

WDB-Z-10A-AC220V

WDB-Z10A-AC220V model refers to that it is of an integrated structure, the current protection ranges from 10A to 50A

and the working power voltage of the protector is AC220V

WDB-FT-100A-AC380V

WDB-FT-100A-AC380V model refers to that it is with communications function and of a separated structure, the current

protection ranges from 30A to 100A and the working power voltage of the protector is AC380V

Current level:

Rating Range Power of motor

10A 1~10A 1~5KW

50A 5~50A 4~25KW

100A 10~100A 20~50KW

200A 20~200A 50~90KW

300A 50~300A 75~150KW

400A 100~400A 100~200KW

500A 150~500A 130~250KW

600A 200~200A 150~300KW

800A 300~800A 200~400KW

Notes:

1. The specifications of protector shall be decided

based on the power of the motor.

2. The voltage rating includes AC220V and AC380V,

based on the voltage of secondary circuit of control

motor.3. A protector under the ratings of 300A, 400A,

500A, 600A and 800A must be equipped with three

current transformers in a transformation ratio of 5A.

4. If three current transformers in a transformation

ratio of 1A are required, please specify when placing

the order.

5. Operating conditions

Three-phase penetration adaptive circuit: AC380V, AC660V

Voltage of working power: AC220V, AC380V

Ambient temperature: -10 - +22; relative humidity ≤90%

ASL not over 2500m

Atmospheric conditions: does not contain medium that may cause explosion, or may corrode metal, destroy

insulation and dust may conduct electricity

Installed in a place without strong impact and vibration, and away from rain and snow

Installed in a place without strong magnetic interference; kept away from soft starter and converter as far as possible





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6. Technical data

6.1 Input/output

Relay output

Trip relay J1 one normally-closed contact

User-defined relay J2 one normally-open contact (for example: closed when alarm sounds, alarm sounds for leakage

only, communication starts, etc.)

Output capacity 250VAC 5A

24VDC 5A

Auxiliary power supply

Voltage of AC power supply AC220V, AC380V±15%

Frequency 50HZ ±2%

Power consumption ≤3W in normal operation

≤5W when protection starts

Serial interface

Link communication terminal

Protocol Modbus

Internet link RS485 bus, shielded twisted pair

6.2 Electrical test

Dielectric resistance

Standard IEC255-5 100MΩ/500V

Insulation test

Standard IEC255-5

Dielectric strength test 2KV(r.m.s), 50HZ, 1min

Surge voltage test 5KV(peak); 1.2/50 u S; 0.5J;

5 positive, 5 negative, interval 5s

EMC immunity

Standard IEC255-22

Common-mode interface 2.5KV(peak), 1MHZ, 400 times/s

Duration: 2s

Common-mode interface 1.0KV(peak), 100KHZ, 50 times/s

Duration: 2s

Disturbance of radioactive electromagnetic field frequency: 27MHZ-1000MHZ; field intensity: 10V/m

Electrostatic discharge interference 8KV

Quick transient interference 2KV; 5KHZ; bipolarity; duration: 1min





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7. Protection feature and set range

7.1 Start-up protection

- During start-up, the protection only covers phase loss, overvoltage, undervoltage, short-circuit and unbalance of three-phase

current.

Start-up delay

Set range 0-255s

Default value 5s

7.2 Protection over unbalance (phase loss) of three-phase current

—— Protection over unbalance of three-phase current: to determine whether the value surpasses the limit based on the ratio of

minimum phase current to maximum phase current, and accordingly to determine whether protection action should be taken.

When current between two phases is greater than the trip value and lasts for certain amount of time (trip time), and fails to return

to normal during the trip time, the protector executes trip command and at the same time displays the trip information about

unbalance of three-phase current on the operation panel.

—— Phase loss protection: when one or two phases of the three-phase current lose and lasts for a certain amount of time (trip

time), and fails to return to normal during the trip time, the protector executes trip command and at the same time displays the

trip information about phase loss on the operation panel.

Function (on/off)

Switch setting 0=off other=onMethod to calculate unbalance =[( maximum current –minimum current)/maximum current ]×100%

Trip value

Set range 20-80

Default value 60 (means that the unbalance percentage of phase with maximum current and phase with minimum

current is 60%)

Trip time ≤ 2.0s

7.3 Locked rotor protection

—— After the completion of start-up, determine whether the value surpasses the limit based on the ratio of maximum phase

current to rated current, and accordingly to determine whether protection action should be taken. When the current is greater

than the trip value and lasts for certain amount of time (trip time), and fails to return to normal during the trip time, the protector

executes trip command and at the same time displays the trip information about locked rotor on the operation panel.

Trip value

Set range 3-8 (3-8 times of rated current)

Default value 5

Trip time ≤ 1.0s

7.4 Overcurrent protection

——The current of motor is calculated to prevent the motor from short service life or damage due to overcurrent. The current of

motor is directly displayed on the panel. The overcurrent protection action is inverse time limit protection, and the time to take

the action can be user-defined based on the demand. The overcurrent multiple and protector action time corresponding to





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overcurrent S/N are shown in Table 1.

Table 1

IA/IN

1 2 3 4 5

≥1.2 60 120 180 240 300

≥1.3 48 96 144 192 240

≥1.4 36 72 108 144 180

≥1.5 8 16 32 48 64

≥2.0 5 10 20 30 40

≥3.0 2 4 8 12 16

≥3.5 1 2 4 6 8

Note: In the table, IN represents setting current, IA represents working current, and the action time is in a

unit of second.

Set range 1-5 (overcurrent S/N)

Default value 1

Set range 0.5-0.8 (rated current)

Default value half of current level

7.5 tE time protection (increased-safety motor)

——determine whether the value surpasses the limit based on the ratio of start-up current to rated current, and accordingly to

determine whether protection action should be taken. When the current is greater than the trip value and lasts for certain amount

of time (trip time), and fails to return to normal during the trip time, the protector executes trip command and at the same time

displays the trip information on the operation panel. The ratio of minimum motor te time to start-up current is IA/IN; and the

characteristics of protection action time is shown in Table 2.

Table 2

IA: start-up current; IN: rated current of motor; te: start action time

Trip value

Set range 0.5-800 (rated current)

Default value half of rated current

Action

time (s)

Set range

S/N





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7.6 Overvoltage protection (voltage of control circuit)

——determine whether the voltage surpasses the limit based on the ratio of measured voltage to rated working voltage, and

accordingly to determine whether protection action should be taken. When the voltage is greater than the trip value and lasts for

certain amount of time (trip time), and fails to return to normal during the trip time, the protector executes trip command and at the

same time displays the overvoltage-caused trip information on the operation panel.

Functions (on/off)

Switch setting maximum value=off other=on

Trip value

Set range 220-286 (overvoltage value)

Default value 264

Trip time ≤ 5.0s

7.7 Undervoltage protection (voltage of control circuit)

——determine whether the voltage surpasses the limit based on the ratio of measured voltage to rated working voltage, and

accordingly to determine whether protection action should be taken. When the voltage is less than the trip value and lasts for certain

amount of time (trip time), and fails to return to normal during the trip time, the protector executes trip command and at the same

time displays the undervoltage-caused trip information on the operation panel.

Function (on/off)

Switch setting 0=off other=on

Trip value

Set range 220-155 (undervoltage value)

Default value 176

Trip time ≤10s

7.8 Protection over short circuit

——determine whether the current value surpasses the limit based on the ratio of maximum line current to rated current, and

accordingly determine whether protection action should be taken. When the current is greater than 8 times of rated current and

lasts for a certain amount of time (trip time), and fails to return to normal during the trip time, the protector executes the trip

command, and at the same time, short-circuit-caused trip information is displayed on the operation panel.

Trip time ≤ 0.2s

7.9 Self-start function (please specify when placing order)

——For a protector with this function, the user needs to set self-start time, and by then the motor cannot be started via

communication start.





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8. Keypad operation and display

8.1 Panel description

In , U represents function code, while the last three digits refer to the parameters of function of U code.

8.2 Functional keys description

Setting: select setting type

Move: under setting status, press down Move key to select the to-be-set item (this item blinks), and revise the parameter via the

Data key. In normal status, press down Move key to display the code of fault occurred before, and press Reset to exit.

Data: under setting status, press Data key once, one more item blinks; when the motor operates normally, press down Data key

to display the voltage value, and press Reset key once to return to current value display.

Reset: under setting status, press Reset to exit setting; press Reset to reset the protector after the protection action is taken, and

then the protector can function as usual once restarted; in normal operation, press Reset to pause the repeat displayof currents but to display certain present current only, and press one more to return to repeat display of currents.

8.3 Operation

——When the protector is powered on, the LCD presents STOP; when the motor is started, the LCD presents “-----“; the

protector enters into operation after start status, and on LCD, the first digit represents the code of current phase, while the last

three digits represent the current value. If the Data key is pressed, the LCD presents voltage value; if the Reset key is pressed,

the LCD presents the current of certain phase constantly, and subsequently, if the Reset key is pressed again, the LCD returns

to repeat display of current of three phases.

8.4 Setting of protection parameters

——During the start and operation of motor, the Setting key is invalid. When the motor is not started and the protector is

powered on, press Setting key to select the setting type, by now the setting indicator lamp is on, then press Move key to move

around, and Data key to revise the data; when the setting of certain parameter is completed, press again the Setting key to next

item until all parameters are set. After all parameters are set, press Reset key to exit setting, then the LCD displays STOP.

Sequence of

operation

Display

contentCode meaning Set range

1st

pressing of

SettingStart-up time 1-99s

2nd

pressing of

SettingRated current Within the range of protection value

3rd

pressing of

Setting

Reverse time limit protection

action in overcurrent

Within the range corresponding to

items 1-5





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4th

pressing of

SettingOvervoltage value About 120% of rated voltage

5th

pressing of

SettingUndervoltage value About 80% of rated voltage

6th

pressing of

SettingLocked rotor multiple 3-8

7th

pressing of

SettingCorrespondence address 0-255

8th

pressing of

SettingLeakage current

Within the range corresponding to

items 0-9

9th

pressing of

Setting

Percentage of unbalanced

three-phase currentAbout 60% of current phase difference

10th

pressing of

Setting

Rated current ratio of ratio-type

transformer

Based on the ratio rating of current

transformer

11th

pressing of

SettingCurrent output On phases A, B, C

12th

pressing of

SettingError in current output

Within the rang of required

positive/negative error

13th

pressing of

Setting

Setting current corresponding

to 20mA outputWithin the range of current level

10th pressing of Setting: Code F corresponds to levels 400A and 600A only, not to other levels, for example a 400: 5 current

transformer, F is set as 400.

When the setting is completed, press again the Reset to exit setting and save the set value.

As for the 11th, 12th and 13th setting above, they are only available for a protector with 4-20mA output function.

8.4 Setting, operation and fault indication

—— When the protector detects fault in the motor, on the LCD, the first digit represents corresponding fault code and

continues to blink before a trip signal is sent out. After the protection action is taken, corresponding fault type, motor current and

voltage are displayed, and the fault indicator lamp turns on.





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9. Outline structure and installation dimension

9.1 Installation method of separated type, and open hole size

9.2 Installation method of integrated type, and size

9.3 Installation method of zero sequence transformer and its size

2A, 10A, 50A, 100A leakage zero sequence current transformer 200A-800A leakage zero sequence current transformer





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10. Wiring diagram

10.1 Wiring principle

10.2 Typical wiring diagram





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Current input





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11. Remote communication system for computer monitoring motor protector

solution

Main

functions

Use of RS485 digital serial interface; communication distance ≤ 1200m (replace of RS232 interface

into RS485 interface via interface card)

Communications between every upper computer (PC) and up to 256 microcomputer-monitored motor

protector available

Protection parameters of every motor revisable; and start and stop of every motor available.

Detection of current, voltage, operational status and fault of every motor available

12. Notes1. When the protector is wired, all terminals should be properly connected based on its purpose.

2. The working power supply of protector should be connected to the control circuit. Noted that the nominal voltage should cater

for the actual voltage.





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3. When the protector is equipped with a current transformer with function of transformation ratio, if an ammeter is required at

site or in the control room, it is better to provide a current transformer with function of transformation ratio, or the display of

phase current with ammeter may be affected.

13 Instructions for order

1. Please specify the model, specifications, quantity and voltage of working power supply of the protector in purchase of a

protector.

2. When ordering a separated protector, the user can make clear the distance between the upper part and lower part of the

protector based on the installation requirements, and the distance shall not be over 5.

3. The warranty period is one years. Within two years since the date the protector is received, you can return the protector to us

in case of any faults or damage during transportation, we would exchange without any additional charge (excluding

manmade damages).

wdb operation manual

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