23
10. Megging
Megging of an installation incorporating a
GRUNDFOS MAGNA pump is not allowed, as the
built-in electronics may be damaged. If megging of
the pump is necessary, the pump should be
electrically separated from the installation.
Megging of the pump can be carried out as
described below.
Noise in the
system.
Air in the system. Vent the system.
The flow is too high. Reduce the setpoint and possibly
change over to AUTO
ADAPT or
constant pressure.
The pressure is too high. Reduce the setpoint and possibly
change over to AUTO
ADAPT or
proportional pressure.
Noise in the
pump.
Air in the pump. Vent the pump.
The inlet pressure is too low. Increase the inlet pressure and/or
check air volume in the expansion
tank (if installed).
Indicator
lights
Fault Cause Remedy
Green Red
The R100 can also be used for fault
finding.
Megging of pumps
1. Switch off the electricity supply.
2. Remove the wires from terminals L and N and the earth
conductor.
3. Short-circuit terminals L and N using a short wire
(see B).
4. Remove the screw for electronics frame connection
(see A).
5. Test between terminals L/N and earth (see C).
Maximum test voltage: 1000 VAC/1500 VDC.
Note: Never test between supply terminals (L and N).
Maximum permissible leakage current: < 35 mA.
6. Fit the screw for electronics frame connection (see A).
7. Remove the short wire between terminals L and N
(see B).
8. Fit the supply wires to terminals L and N and the earth
conductor.
9. Switch on the electricity supply.
TM02 0238 0904
Grundfos.bk Page 23 Friday, January 15, 2010 3:23 PM
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