Service Manual Damcos LPU: Troubleshooting Guide LPU
SM 8000-100-01 Ed 04 February 2017
56
Motor running hot, LPU is operating normally
Caution! Motor is designed for 25% duty cycle only.
Action: • LPU-S
Observe that LPU does not restart.
If it is restarting frequently, the motor is running hot. See“LPU-S frequently restarting in open
position” on page 47.
• Measure the supply voltage (220 - 230 V AC) to LPU.
If it differs widely from the required voltage, the voltage must be modified.
• Measure the resistance over the motor windings, on the terminal (easiest with disconnected
capacitor). There must be approximately 15
between “N” and “OPEN” and “CLOSE” respec-
tively.
If this resistance is not observed, the motor is to be replaced.
• The mechanical resistance of the motor can be too high.
If it cannot be turned easily with the fingers, it is to be replaced.
• The mechanical resistance of the pump can be too high, if ball bearing is blocked.
Dismount valve block and pump rotor as to change pump (see “Replace Pump in LPU” on
page 93) and check if ball bearing can rotate freely.
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