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

Operation guide
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
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Installation, Operation and Maintenance Manual for PAHT 20-90 pumps
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 o ce.
3.4.1 Dismantle pump and check for wear.
Comments
Pressure changes due to ow restrictions. This
will also cause high motor torque.
Pumps run in parallel with cascade start, may
switch o 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 su cient torque.
Too heavy damage in the pump will increase
friction causing a high torque (see item 6,
Typical signs of wear).
© Danfoss | 2023.12