6. Electrical connection
6.1 General
The electrical connection should be carried out by an
authorised electrician in accordance with local
regulations.
WARNING
Electric shock
Death or serious personal injury
‐
Before starting work on the pump,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
‐
The pump must be earthed.
‐
The pump must be connected to an ex-
ternal mains switch with a minimum
contact gap of 3 mm in all poles.
‐
If the motor cable is damaged, it must
be replaced by Grundfos, an author-
ised Grundfos service workshop or
similarly qualified persons to avoid a
hazard.
The supply voltage, rated maximum current and
power factor (PF) appear from the motor nameplate.
The required voltage for Grundfos submersible
motors, measured at the motor terminals, is - 10 %/+
6 % of the nominal voltage during continuous
operation (including variation in the supply voltage
and losses in cables).
WARNING
Electric shock
Death or serious personal injury
‐
If the pump is connected to an electric
installation where an earth-leakage cir-
cuit breaker (ELCB) is used as an ad-
ditional protection, this circuit breaker
must
trip out when earth fault currents
with DC content (pulsating DC) occur.
The earth leakage circuit breaker
must
be marked
with the following symbol:
.
Supply voltage
1 x 200-240 V - 10 %/+ 6 %, 50/60 Hz, PE.
The current consumption can only be measured by
means of a true RMS instrument. If other instruments
are used, the value measured will differ from the
actual value.
On SQ/SQE pumps, a leakage current of 2.5 mA at
230 V, 50 Hz, can typically be measured. The leakage
current is proportional to the supply voltage.
The SQE and SQE-NE pumps can be connected to a
control box, type CU 300 or CU 301.
The pump must never be connected to a
capacitor or to another type of control box
than CU 300 or CU 301.
The pump must never be connected to an
external frequency converter.
11
English (GB)
Summary of Contents for SQ 1
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