Danfoss MCD3000 Series Manual page 42

Code Cause & Action
Motor thermistor trip.
3
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.
Phase imbalance trip.
4
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.
Supply frequency trip.
5
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.
Phase rotation trip.
6
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.
Instantaneous overload trip.
7
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.
42
MCD3000 Series
Code Cause & Action
Power circuit fault.
8
•
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.
Undercurrent trip.
9
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.
RS485 communications fault
c
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.
EEPROM Read/Write failure.
e
The MCD3000 has been unable to
Read/Write to the internal EEPROM.
•
Contact your nearest Danfoss
office.
Starter overtemperature.
f
An excessive heatsink temperature has
been recorded.
•
Ensure all cooling fans are working.
•
Ensure cooling air is able to flow
freely into and out of the starter.
•
Ensure the temperature of the
cooling air entering the MCD3000
does not exceed the rated
temperature.
•
Reset and restart the MCD3000
after allowing time for the heatsink
to cool.
MG.15.A2.22 – VLT is a registered Danfoss trademark