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31 

Table 4-3 Fault 0 

(Alarm) General fault on transformer 

The hardware contact in the power unit has tripped. 

There is a defect in the inverter. 

 

Replace the affected components. 
Replace the drive. 

 

Table 4-4 Faults 1 and 33 

Message 1 (alarm): Inverter is signaling overtemperature, stage 1 
Fault 33 (alarm): Inverter is signaling overtemperature, stage 2 

An excessive heatsink temperature in the inverter has 
been detected. 
The thermoclick circuit for the reactors and transformers 
has been interrupted. 
Cooling system is not working properly 

o

 

Drive fan is not running 
⇒  Fan motor is defective 
⇒  Start capacitor is defective 
⇒  No power supply to fan 

⇒ 

USI is defective 

⇒ 

Infeed transformer is defective 

o

 

Heatsink is blocked 

o

 

Drive fan speed is too low 
⇒  Infeed transformer is connected to tap 

460 V instead of 400 V 

o

 

Current is too high 

⇒  Parameter setting error (CU software – 

current limit value) 

o

 

IGBT module defective 

o

 

Temperature sensor in heatsink is defective 

o

 

Temperature sensor connection is defective 

o

 

CU data input is defective 

 

o

 

Cooling system is not working properly 
⇒  Housing fans are not running  

⇒  Fans are defective 
⇒  Thermostat is defective 
⇒  Thermostat is incorrectly set 

⇒  Air intake is restricted 

⇒  Air inlet grille on housing is clogged 

up 

⇒  Air outlet is restricted