High Torque On Electric Motor - Danfoss PAHT C Installation, Operation And Maintenance Manual

Guide line | Trouble shooting guide for PAH, PAHT, PAHT C , PAHT G, PAHT 674 and PAH F pumps
3.

High torque on electric motor

Cause
3.1 Too high outlet pressure from pump
3.2 Pump starts against pressure
3.3 Constant torque
3.4 Water pump damage
62
Remedy
3 . 1 . 1 Check for blocked nozzles or a faulty
adjusted relief valve .
3 .2 . 1 Check that electric motor is correctly sized .
3 .2 .2 Check internal parts (see item 2 . 1 ) .
3 .2 .3 Systems with more than one electric motor
installed:
Start motors simultaneously .
3 .3 . 1 Please contact Danfoss High Pressure
Pumps sales office .
3 .4 . 1 Dismantle pump and check for wear .
180R9316 | AQ176586503002en-000501 | IOM PAHT C 2-6.3 pumps | 01.2022
Comments
Pressure changes due to flow restrictions . This
will also cause high motor torque .
Pumps run in parallel with cascade start, may
switch off the motor relay due to too high
torque caused by high outlet pressure .
If the electric motor is too small for the pump, it
cannot provide sufficient torque .
Too heavy damage in the pump will increase
friction causing a high torque (see item 6,
Typical signs of wear) .