Grundfos CM series Service Instructions

Cause Remedy
Motor winding is defective. • Repair or replace the motor.
The pump is mechanically blocked. • Switch off the electricity supply, and clean or repair the pump.
The setting of the motor-protective circuit breaker is too low. • Set the motor-protective circuit breaker according to the rated
current of the motor (I
1/1
). See nameplate.
6.3 The motor-protective circuit breaker trips out occasionally.
Cause Remedy
The setting of the motor-protective circuit breaker is too low. • Set the motor-protective circuit breaker according to the rated
current of the motor (I
1/1
). See nameplate.
Periodic supply failure. • Check cables and cable connections for defects, and replace the
fuses.
Periodically low voltage. • Check cables and cable connections for defects and loose
connections.
• Check that the supply cable of the pump is correctly sized.
20
English (GB)

Grundfos CM series Specifications

General

Enclosure Class	IP55
Impeller Material	Stainless steel
Type	Centrifugal
Material	Cast iron or stainless steel (various grades depending on model)
Motor range	0.37 kW to 4 kW (depending on model)
Applications	Water supply, Industrial processes
Maximum Operating Pressure	10 bar
Installation	Horizontal or Vertical
Stages	Multi-stage
Motor Power	0.37 kW to 4 kW (depending on model)
Speed	2900 rpm
Power supply	1 x 220-240 V, 50/60 Hz or 3 x 220-240/380-415 V, 50/60 Hz (depending on model)