Danfoss PAH 20

Guideline Trouble shooting guide for PAH, PAHT, PAHT C , PAHT G, PAHT 674 and PAH F pumps
64
180R9380 | AQ213286502970en-000701 | IOM PAH 20-100 pumps | 11.2021
Cause Remedy Comments
3.1 Too high outlet pressure from pump 3.1.1 Check for blocked nozzles or a faulty
adjusted relief valve.
Pressure changes due to ow restrictions. This
will also cause high motor torque.
3.2 Pump starts against pressure 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.
Pumps run in parallel with cascade start, may
switch o the motor relay due to too high
torque caused by high outlet pressure.
3.3 Constant torque 3.3.1 Please contact Danfoss High Pressure
Pumps sales oce.
If the electric motor is too small for the pump, it
cannot provide sucient torque.
3.4 Water pump damage 3.4.1 Dismantle pump and check for wear. Too heavy damage in the pump will increase
friction causing a high torque (see item 6,
Typical signs of wear).
3. High torque on electric motor