19
(
Q
J
OLV
K
8
6
11. 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
TM
0
3
0
908
0
705
• Switch off the electricity supply.
• Open the connection box.
2
T
M
03
09
09
07
05
• Remove the supply wires L and N and the
earth ground wire (GND).
3
TM
03
09
10
07
05
• Short-circuit the wires L and N using a
wire.
• Test between the wires L/N and earth
ground (GND).
Test voltage: Max. 1000 VAC/1500 VDC.
Maximum permissible leakage current < 35
mA.
Note: Never test between the supply wires
(L and N).
4
TM
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 ground wire (GND).
• Switch on the electricity supply.
L
N GND
GND
L/N
GND
L/N
