Faults, Alarms And Possible Causes - WEG CFW-11 User Manual

Troubleshooting and Maintenance

6.2 FAULTS, ALARMS AND POSSIBLE CAUSES

Fault/Alarm
F006:
Imbalance or
Input Phase Loss
F021:
DC Bus Undervoltage
F022:
DC Bus Overvoltage
F030:
Power Module U Fault
F034:
Power Module V Fault
F038:
Power Module W Fault
F042:
DB IGBT Fault
A046:
High Load on Motor
A047:
6
IGBT Overload Alarm
F048:
IGBT Overload Fault
A050:
IGBT High
Temperature
F051:
IGBT
Overtemperature
F067:
Incorrect Encoder/
Motor Wiring
6-2
Table 6.1 - Faults, alarms and possible causes
Description
Mains voltage imbalance too high or phase missing
in the input power supply.
Note:
- If the motor is unloaded or operating with reduced
load this fault may not occur.
- Fault delay is set at parameter P0357.
P0357=0 disables the fault.
DC bus undervoltage condition occurred.
DC bus overvoltage condition occurred.
Desaturation of IGBT occured in Power Module U.
Desaturation of IGBT occured in Power Module V.
Desaturation of IGBT occured in Power Module W.
Desaturation of Dynamic Braking IGBT occured.
Load is too high for the used motor.
Note:
It may be disabled by setting P0348=0 or 2.
An IGBT overload alarm occurred.
Note:
It may be disabled by setting P0350=0 or 2.
An IGBT overload fault occurred.
A high temperature alarm was detected by the NTC
temperature sensors located on the IGBTs.
Note:
It may be disabled by setting P0353=2 or 3.
IGBT overtemperature fault [measured with the
temperature sensors (NTC)].
Fault related to the phase relation of the encoder
signals.
Note:
- This fault can only happen during the self-tuning
routine.
- It is not possible to reset this fault.
- In this case, turn off the power supply, solve the
problem, and then turn it on again.
Possible Causes
Phase missing at the inverter's input power supply.
Input voltage imbalance >5 %.
The input voltage is too low and the DC bus voltage dro-
pped below the minimum permitted value (monitor the value
at Parameter P0004):
Ud < 223 V - For a 220-230 V three-phase input voltage;
Ud < 385 V - For a 380 V input voltage (P0296=1);
Ud < 405 V - For a 400-415 V input voltage (P0296=2);
Ud < 446 V - For a 440-460 V input voltage (P0296=3);
Ud < 487 V - For a 480 V input voltage (P0296=4).
Phase loss in the input power supply.
Pre-charge circuit failure.
Parameter P0296 was set to a value above of the power
supply rated voltage.
The input voltage is too high and the DC bus voltage sur-
passed the maximum permitted value:
Ud > 400 V - For 220-230 V input models (P0296=0);
Ud > 800 V - For 380-480 V input models (P0296=1, 2,
3, or 4).
Inertia of the driven-load is too high or deceleration time is
too short.
Wrong settings for parameters P0151, or P0153, or P0185.
Short-circuit between motor phases U and V or U and W.
Short-circuit between motor phases V and U or V and W.
Short-circuit between motor phases W and U or W and V.
Short-circuit between the connection cables of the dynamic
braking resistor.
Settings of P0156, P0157, and P0158 are too low for the
used motor.
Motor shaft load is excessive.
High current at the inverter output – consider the values
of the tables 8.1 to 8.5 according to the used switching
frequency.
High current at the inverter output – consider the values
of the tables 8.1 to 8.5 according to the used switching
frequency.
Surrounding air temperature is too high (>45 °C (113 °F))
and output current is too high.
Heatsink fan blocked or defective.
Inverter heatsink is completely covered with dust.
Output motor cables U, V, W are inverted.
Encoder channels A and B are inverted.
Encoder was not properly mounted.