Megging - Grundfos MAGNA 40-120 Montage- Und Betriebsanleitung

Indicator
lights
Fault
Green Red
Noise in the
system.
Noise in the
pump.
The R100 can also be used for fault finding.
Note

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.
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.
Cause
Air in the system.
The flow is too high.
The pressure is too high.
Air in the pump.
The inlet pressure is too low.
Remedy
Vent the system.
Reduce the setpoint and possibly
change over to AUTO
constant pressure.
Reduce the setpoint and possibly
change over to AUTO
proportional pressure.
Vent the pump.
Increase the inlet pressure and/or
check air volume in the expansion
tank (if installed).
B
or
ADAPT
or
ADAPT
A
C
29