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4.2.5.2 Three-phase connections
The cables in the terminal box must be as short as possible. However, the separated protective earth conductor must be so long that it is the
last one to be disconnected in case the cable is inadvertently pulled out of the cable entry.
To avoid loose connections, ensure that the terminal block for L1, L2 and L3 is pressed home in its socket when the power cable has been
connected.
Check that the supply voltage and frequency correspond to the values stated on the nameplate.
If you want to supply the product through an IT network, make sure that you have a suitable product variant. If you are in doubt,
contact Grundfos. Only the following motors can be supplied through an IT network:
•
Motors with a speed of 1450-2000/2200 rpm and up to 1.5 kW
•
Motors with a speed of 2900-4000 rpm or 4000-5900 rpm and up to 2.2 kW.
Corner earthing is not allowed for supply voltages above 3 x 240 V and 3 x 480 V, 50/60 Hz.
Mains connection on a three-phase motor
L3
L2
L1
PE
Pos.
L1
L2
L3
PE
4.2.6 Residual-current circuit breakers
DANGER
Electric shock
Death or serious personal injury
‐
If national legislation requires a Residual Current Device (RCD) or equivalent in the electrical installation, this must be type B or
better, due to the nature of the constant DC leakage current.
The residual-current circuit breaker must be marked.
Take into account the total leakage current of all the electrical equipment in the installation.
This product may cause a direct current in the protective-earth conductor.
Connection example for single-phase supply
The drawing shows an example of a mains-connected single-phase motor with a main switch, a backup fuse and a residual-current circuit
breaker, type B.
1
N
L
PE
16
Description
Phase 1
Phase 2
Phase 3
Protective earth
N
L
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