Grundfos SQE 2 - 55 (96510151) [9/420] General
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Grundfos SQE 2 - 55 (96510151) [9/420] General

Grundfos SQE 2 - 55 (96510151) [9/420] General
English (GB)
9
5. Electrical connection
5.1 General
The electrical connection should be carried out by an
authorised electrician in accordance with local
regulations.
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).
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.
5.2 Motor protection
The motor incorporates thermal overload protection
and requires no additional motor protection.
5.3 Connection of motor
The motor incorporates a starter device and can
therefore be connected directly to the mains.
Start/stop of the pump will typically be done via a
pressure switch. See fig. 4.
Fig. 4
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
external 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 authorised
Grundfos service workshop or similarly
qualified persons to avoid a hazard.
WARNING
Electric shock
Death or serious personal injury
- If the pump is connected to an electric
installation where an earth-leakage
circuit breaker (ELCB) is used as an
additional protection, this circuit breaker
must trip out when earth fault currents
with DC content (pulsating DC) occur.
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.
The pressure switch must be rated for the
maximum amps of the specific pump size.
TM01 1480 4697
NL
P
Pressure switch

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