Megging - Grundfos MAGNA 2000-Serie Montage- Und Betriebsanleitung

10. Megging

Warning
Before removing the cables, the
electricity must be switched off.
Procedure:
Step
1
2
3
L/N
4
L/N
Megging of the pump
Illustration
PE
PE
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.
Action
• Switch off the electricity supply.
• Open the connection box.
• Remove the supply wires L and N and the earth
wire (PE).
• Short-circuit the wires L and N using a wire.
• Test between the wires L/N and earth (PE).
Test voltage: Max. 1000 VAC/1500 VDC.
Maximum permissible leakage current < 3.5 mA.
Note: Never test between the supply wires
(L and N).
Test the cable to the pump.
• Pull the plug out of the pump and test again.
• Refit the supply wires L and N and the earth wire
(PE).
• Switch on the electricity supply.
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