24
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.
Procedure:
Warning
Before removing the cables, the
electricity must be switched off.
Megging of the pump
Step
Illustration
Action
1
TM0
3
090
8
0
7
0
5
• Switch off the electricity supply.
• Open the connection box.
2
TM
03
09
09
07
05
• Remove the supply wires L and N and the earth
wire (PE).
3
TM
03
0
910
07
05
• 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 < 35 mA.
Note:
Never test between the supply wires
(L and N).
4
T
M
03
09
1
1
0
7
0
5
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.
PE
L/N
PE
L/N
Summary of Contents for MAGNA 25-100
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