List of Warnings and Alarms

The table below lists the different warnings and alarms for the VLT frequency converter and indicates whether the fault locks the converter. After a Trip lock, the mains supply must be cut off, and the fault must be corrected. Reconnect the mains supply and reset the VLT frequency converter before resuming operation. A Trip can be reset manually in three ways:

+ Via the control key [RESET]
+ Via a digital input
+ Via serial communication

Additionally, an automatic reset may be selected in parameter 400 (Reset function).

A cross placed under both Warning and Alarm indicates that a warning may precede the alarm. It can also mean that it is possible to program whether a given fault results in a warning or an alarm, such as in parameter 117 (Motor thermal protection). After a trip, the motor will coast, and both the alarm and warning will flash on the VLT frequency converter. If the fault is removed, only the alarm will flash. After a reset, the VLT frequency converter will be ready to start operation again.
 
10 Volts Low (10 VOLT LOW) 

Live Zero Fault (LIVE ZERO ERROR) 

Mains Imbalance (MAINS IMBALANCE)

Voltage Warning High (DC LINK VOLTAGE HIGH)

Voltage Warning Low (DC LINK VOLTAGE LOW)

Overvoltage (DC LINK OVERVOLT) 

Undervoltage (DC LINK UNDERVOLT)

Inverter Overloaded (INVERTER TIME)

Motor Overloaded (MOTOR TIME) 

Motor Thermistor (MOTOR THERMISTOR) 

Current Limit (CURRENT LIMIT)  

Overcurrent (OVERCURRENT) 

Earth Fault (EARTH FAULT)-

Switch Mode Fault (SWITCH MODE FAULT)  

Short-circuit (CURR.SHORT CIRCUIT) 

Serial Communication Timeout (STD BUSTIMEOUT)

HPFB Bus Timeout (HPFB TIMEOUT)  

Fault in EEprom on Power Card (EE ERROR POWER)           

Fault in EEprom on Control Card (EE ERROR CONTROL)           

Auto-optimisation Not OK (AMA FAULT) 

Heat-sink Temperature Too High (HEAT SINK OVERTEMP.) 

Motor Phase U Missing (MISSING MOT.PHASE U) 

Motor Phase V Missing (MISSING MOT.PHASE V) 

Motor Phase W Missing (MISSING MOT.PHASE W) 

HPFB Communication Fault (HPFB COMM. FAULT)  

Inverter Fault (GATE DRIVE FAULT) 

Check Parameters 104 and 106 (CHECK P.104 & P.106) 

Check Parameters 103 and 105  (CHECK P.103 & P.106)

Motor Too Big (MOTOR TOO BIG)-

Motor Too Small (MOTOR TOO SMALL) 

Safety Stop (EXTERNAL FAULT)  

Output Frequency Low (FOUT < FLOW) 

Output Frequency High (FOUT > FHIGH)  

Output Current Low (I MOTOR < I LOW) 

Output Current High (I MOTOR > I HIGH) 

Feedback Low (FEEDBACK < FDB LOW) 

Feedback High (FEEDBACK > FDB HIGH) 

Reference Low (REF. < REF. LOW) 

Reference High (REF. > REF. HIGH) 

Temperature Auto Derate (TEMP.AUTO DERATE)

Unknown Fault (UNKNOWN ALARM) 

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