CookTek MCD3000 Specifications download pdf (Page 44)

MCD3000 Series

MG.15.A4.22 - VLT is a registered Danfoss trademark 43

Fault Procedure

Code Cause & Action

3

Motor thermistor trip.

Thermistors in the motor have indicated

an overtemperature state.

• Identify and correct the cause of the

motor overheating.

• Wait for the motor to cool

sufficiently to allow a restart.

• Reset the MCD3000.

• Restart the motor.

If no motor thermistors are connected;

• Ensure that there is a closed circuit

across the MCD3000 motor

thermistor input terminals.

4

Phase imbalance trip.

An imbalance in phase currents has

exceeded the limits programmed in Par.

7 Phase Imbalance Sensitivity.

• Check the supply voltage.

• Verify the motor circuit.

• Reset the MCD3000.

• Restart the motor.

• Check phase currents.

5

Supply frequency trip.

The supply frequency has varied outside

the allowed limits. Refer to Specification

section.

• Identify and correct the cause of the

frequency variations. (Note that the

loss of the three phase supply is a

0Hz condition and may be the

cause of a Supply frequency trip).

• Reset the MCD3000.

• Restart the motor.

6

Phase rotation trip.

Phase rotation protection has been set

and a prohibited phase rotation has

been detected. Refer Par. 11 Phase

Rotation Protection.

• Correct the phase rotation.

• Reset the MCD3000.

• Restart the motor.

7

Instantaneous overload trip.

An instantaneous overload exceeding

the limit programmed in Par. 9

Instantaneous Overload Trip Point has

been detected.

• Identify and correct the cause of the

instantaneous overload.

• Reset the MCD3000.

• Restart the motor.

Code Cause & Action

8

Power circuit fault.

• Ensure voltage is present on the

MCD3000 input terminals (L1, L2 &

L3).

• Ensure the motor is correctly

connected to the MCD3000 output

terminals (T1, T2 & T3).

• Test the MCD3000 power modules

(SCRs) using the SCR Test

described later in this section of the

manual under the Test and

Measurement Procedures heading.

9

Undercurrent trip.

Motor run current has fallen below the

limit programmed in Par. 8 Undercurrent

Trip Point.

• Identify and correct the cause of the

undercurrent situation.

• Reset the MCD3000.

• Restart the motor.

c

RS485 communications fault

The RS485 link with the MCD3000 has

been inactive for a time greater than

programmed in Par. 24 Serial

Communication - RS485 Time Out.

• Identify and correct the cause of the

RS485 failure.

• Reset the MCD3000.

e

EEPROM Read/Write failure.

The MCD3000 has been unable to

Read/Write to the internal EEPROM.

• Contact your nearest Danfoss

office.

FLC range error

The MCD3000 has detected that the

motor is connected in the 3 Wire

configuration and that Par 1. Motor FLC

or Par. 25 Motor FLC has been set in

excess of the MCD3000’s maximum

capability for this connection format.

• Reduce the motor FLC setting and

then reset the MCD3000. Note that

the MCD3000 cannot be reset until

the FLC setting has been corrected.

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