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acceptable level) and when the Digital Input from the MCB 112 is deac-
tivated. Warning: Automatic Restart.
ALARM 72, Dangerous Failure:
Safe Stop with Trip Lock. Unexpected signal levels on Safe Stop and Dig-
ital Input from the MCB 112 PTC Thermistor Card.
ALARM 80, Drive Initialised to Default Value:
Parameter settings are initialised to default setting after a manual (three-
finger) reset.
ALARM 90, Encoder loss:
Check the connection to encoder option and eventually replace the MCB
102 or MCB 103.
ALARM 91, Analogue Input 54 Wrong Settings:
Switch S202 has to be set in position OFF (voltage input) when a KTY
sensor is connected to analogue input terminal 54.
ALARM 250, New Spare Part:
The power or Switch Mode Power Supply has been exchanged. The fre-
quency converter type code must be restored in the EEPROM. Select the
correct type code in Par 14-23 according to the label on unit. Remember
to select ‘Save to EEPROM’ to complete.
ALARM 251, New Type Code:
The Frequency Converter has got a new type code.
FC 300 Programming Guide
3. Troubleshooting
MG.33.M3.02 - VLT
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is a registered Danfoss trademark
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