11. Electrical installation
DANGER
Electric shock
Minor or moderate 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
1 x 230 V + 10 %/- 15 %, 50/60 Hz.
The pump is externally controlled via PWM signal, LIN
bus signal or internally speed-controlled by a frequency
converter. Therefore, the pump 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
The pump operation is ensured above 160 VAC with
reduced performance.
Pumps with PWM and LIN bus control
If the voltage falls below 190 VAC, a low voltage warning
is sent via the PWM or LIN bus signal.
If the voltage falls below 150 VAC, the pump stops and a
low voltage alarm is sent via the PWM or LIN bus signal.
Pumps in internal control mode
If the voltage falls below 150 VAC, the pump stops and
shows an alarm.
Earth leakage circuit breaker (ELCB)
DANGER
Electric shock
Death or serious personal injury
‐ In case of an insulation fault, the fault current may
be pulsating DC. Observe national legislation about
requirements for and selection of Residual Current
Device (RCD) when installing the pump.
Leakage current
The pump mains filter will cause 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.
UPM3
11
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Electrical installation
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