Electrical Installation - Grundfos Medium UPM Series Data Booklet

8

Electrical installation

DANGER
Electric shock
▲ Death or serious personal injury
► Before starting any work at the pump, switch
off the power supply. Make sure that the
power supply cannot be switched on
accidentally.
All electrical connections must be
carried out by a qualified electrician in
accordance with local regulations.
The pump is not a safety component and
cannot be used to ensure functional
safety in the final appliance.
• The pump requires no external motor protection.
• Check that the supply voltage and frequency
correspond to the values stated on the nameplate.
• The pump must not be used with an external speed
control which varies the supply voltage.
• If an earth leakage circuit breaker is used, check
which type it is.
• If an external relay is used, check if it can stand the
inrush current.
Supply voltage
EU version: 1 x 230 V + 10 %/- 15 %, 50/60 Hz.
The Medium UPM pumps are externally controlled via
PWM signal or internally speed-controlled by a
frequency converter. Therefore, the pumps must not
be used with an external speed control which varies
the supply voltage, for example phase-cut or pulse-
cascade control.
Reduced supply voltage
Medium UPM with PWM control: If the voltage falls
below the specified voltage range (< 195 V), a low
voltage warning is sent via PWM return signal.
The signal is disabled on variants with FlowEstimation.
In case of low voltage, the reduced performance is
visible via the FlowEstimation signal.
26
Earth leakage circuit breaker (ELCB)
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 A or
better, according to the nature of the
pulsating DC leakage current.
If the pump is connected to an electric installation that
uses an earth leakage circuit breaker (ELCB) as
additional protection, this circuit breaker must trip
when earth fault currents with DC content (pulsating
DC) occur.
The earth leakage circuit breaker must be marked with
the first (type A) or both (type B) of the symbols shown
below:
Fig. 39 Symbol on earth leakage circuit breaker
Leakage current
The pump mains filter causes a leakage current to
earth during operation.
Leakage current: < 3.5 mA.
High-voltage test
All Grundfos pumps are tested with 1000 VAC for 1
second according to EN 60335-1 Annex A.
ECM pumps incorporate filter components (including Y
capacitors) that are connected to protective earth. The
capacitors are class Y2 film capacitors with normal
requirements. Every high-voltage test exposes the Y
capacitors to high voltage.
The voltage level and the amount of tests should be as
low as possible, in order to grant longest lifetime in the
market. Additional standard high-voltage tests of the
complete pump including filter should be avoided to
eliminate the risk of filter damage.
Medium UPM