User`s manual

apfiff09 marine vacon • 249
24-
7
F17 Motor underload fault
The purpose of the motor underload protection is to ensure that there is load on the motor when the
drive is running. If the motor loses its load there might be a problem in the process, e.g. a broken
belt or a dry pump.
The underload curve is a squared curve set between the zero frequency and the field weakening
point. The protection is not active below 5Hz (the underload time counter is stopped).
The torque values for setting the underload curve are set in percentage which refers to the nominal
torque of the motor. The motor's name plate data, parameter motor nominal current and the drive's
nominal current I
H
are used to find the scaling ratio for the internal torque value..
Correcting measures:
 Check load.
F22 EEPROM checksum fault
Possible cause:
1. Parameter save fault
2. Faulty operation
3. Component failure
Correcting measures:
 Should the fault re-occur, contact your local distributor.
F24 Counter fault
Possible cause:
1. Values displayed on counters are incorrect
Correcting measures:
 Have a critical attitude towards values shown on counters.
F25 Microprosessor watchdog fault
Possible cause:
1. Start-up of the drive has been prevented.
2. Run request is ON when a new application is loaded to the drive.
Correcting measures:
 Reset the fault and restart.
 Should the fault re-occur, contact your local distributor.
F26 Start-Up prevention
Possible cause:
1. Start-up of the drive has been prevented.
2. Run request is ON when a new application is loaded to drive
Correcting measures:
 Cancel prevention of start-up if this can be done safely.
 Remove Run Request.