8.1 Mechanical function 8 Trouble tracing
56
8.1 Mechanical function
(except sediment discharge
function and axial seals)
During a start, the following functions are
disconnected: Overload protection (bimetal relay)
and overcurrent protection (when star
connection).
Indication Cause Remedy
Start
No control voltage Power supply failure. Fuses in
control panel have blown or
tripped
Find the fault. Change or reset
fuse
Separator motor does not
start
Thermistor relay not operating Check. Remedy
Thermistor relay tripped before
start
Motor too hot. See below
Smell of burning Brake not released Check the air pressure to
brake
Wrong motor or motor defect Change or repair motor
Motor stops during start-up
due to overheating
Thermistor relay trips due to
repeated starts of motor
Remove motor hood. Allow
motor to cool down (at least 3
hours – if no extra fan cooling)
Unusually long running-up
period
Relay in starter has not
switched over from star to
delta
Check setting of relay
Unusually long running-up
period or starting current
too high
Product admitted too early Check. Remedy
Supply voltage too low Check. Remedy
Motor defect Check. Remedy
Unusually short running-up
period
Relay in starter has switched
over from star to delta too soon
Check relay setting
Overvoltage of power supply Check. Remedy
Motor defect Check. Remedy
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