IBCcontrol MicroMax750, Manual

Page: 10 / 16

Rotation monitor
Probable fault cause on
installation
Probable fault cause in
operation
Alarms and trips if a pulse is not received every 5 minutes.
- Magnet turned the wrong way
- Rotation monitor incorrectly connected (wrong polarity),
refer to “Connections” on page 10
- Too wide a gap between the magnetic sensor and magnet, max 15 mm
- Broken belt
- Belt slipping
- Stuck rotor
- Magnetic sensor or magnet not intact
Overtemperature motor
Probable fault cause
Alarms and trips if motor winding temperature is too high.
The thermal contact in the motor reverts to normal mode when the
temperature drops.
See "Overcurrent" on page 9.
Overvoltage Alarms and trips if the connection voltage exceeds 276 V
for more than 4-5 seconds
.
Undervoltage Alarms and trips if the connection voltage drops below 195 V
for more than 4-5 seconds.
Short circuit/overcurrent
Probable fault cause
Alarms and trips in the event of a phase-to-phase or phase-to-earth
short circuit and overcurrent.
Short circuit phase-phase orphase-earth (earth fault)
MicroMax750 trips immediately.
- Motor winding fault
Measure motor resistance, it should be identical on all phases.
- Short circuit between phases in the cable
- Earth fault in the motor or cable
ALARMS
All alarms remain in state.
Continued on next page
8