Grundfos CMBE User Manual

11.3 Pump performance is unstable
The pump performance is unstable. No lights on
Grundfos Eye.
TM063804
Cause Remedy
The pump inlet pressure
is too low.
• Check the inlet
conditions of the pump.
The inlet pipe is partly
blocked by impurities.
• Remove and clean
the inlet pipe.
Leakage in
the inlet pipe.
• Remove and repair
the inlet pipe.
Air in the inlet pipe or
the pump.
1. Vent the inlet pipe or
the pump.
2. Check the inlet
conditions of the pump.
11.4 Pump runs backwards when switched
off
The pump runs backwards when switched off. No
lights on Grundfos Eye.
TM063804
Cause Remedy
Leakage in
the inlet pipe.
• Remove and repair
the inlet pipe.
The non-return valve is
defective.
• Remove and clean,
repair or replace the
valve.
21
English (GB)

Grundfos CMBE Specifications

General

Flow Rate	Up to 6 m³/h
Material	Stainless Steel
Motor Type	Permanent magnet motor
Liquid Temperature	0°C to +60°C
Maximum Operating Pressure	10 bar
Enclosure Class	IP55
Frequency	50 / 60 Hz
Pump Type	Centrifugal pump
Power Supply	1 x 200-240 V
Control	Integrated Frequency Converter
Max Head	60 m
Seal Type	Mechanical seal
Motor Power	0.3 - 1.5 kW