Grundfos CRE Series Installation And Operating Instructions Manual page 7

This circuit breaker is type B.
The total leakage current of all the electrical equipment in the
installation must be taken into account.
The leakage current of the motor in normal operation can be seen
in section 22.3 Leakage current on page 32.
During start and at asymmetrical supply systems, the leakage
current can be higher than normal and may cause the ELCB to
trip.
6.2.5 Motor protection
The pump requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking (IEC 34-11, TP 211).
6.2.6 Protection against voltage transients
The pump is protected against voltage transients by built-in
varistors between the phases and between phases and ground.
6.2.7 Supply voltage and power supply
3 x 380-480 V - 10 %/+ 10 %, 50/60 Hz, PE.
The supply voltage and frequency are marked on the pump
nameplate. Make sure that the pump is suitable for the power
supply of the installation site.
The wires in the terminal box must be as short as possible.
Excepted from this is the protective ground lead which 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.
Power connection
Fig. 6
Cable glands
Cable glands comply with EN 50626.
• 2 x M16 cable gland
• 1 x M20 cable gland
• 2 x M16 knock-out cable entries.
Warning
If the supply cable is damaged, it must be
replaced by qualified personnel.
Grid types
Three-phase E-pumps can be connected to all grid types.
DBP-1 - GRUNDFOS PUMP CRE - 99392005
6.2.8 Start/stop of pump
When the pump is switched on via the power supply, it will start
after approx. 5 seconds.
If a higher number of starts and stops is desired, use the input for
external start/stop when starting/stopping the pump.
When the pump is switched on via an external on/off switch, it will
start immediately.
Automatic restart
However, automatic restart only applies to fault types set up to
automatic restart. These faults could typically be one of these
faults:
• temporary overload
• fault in the power supply.
6.2.9 Connections
L1
L1
L2
L2
L3
L3
As a precaution, the wires to be connected to the following
connection groups must be separated from each other by
reinforced insulation in their entire lengths:
Group 1: Inputs
• start/stop
• digital input
• setpoint input
• sensor input
• GENIbus
All inputs (group 1) are internally separated from the power-
conducting parts by reinforced insulation and galvanically
separated from other circuits.
All control terminals are supplied with protective extra-low voltage
(PELV), thus ensuring protection against electric shock.
Group 2: Output (relay signal, terminals NC, C, NO)
The output (group 2) is galvanically separated from other circuits.
Therefore, the supply voltage or protective extra-low voltage can
be connected to the output as desired.
Warning
Do not connect three-phase E-pumps to a power
supply with a voltage between phase and ground
of more than 440 V.
The number of starts and stops via the power
supply must not exceed 4 times per hour.
If a pump set up for automatic restart is stopped
due to a fault, it will restart automatically when
the fault has disappeared.
If no external on/off switch is connected,
connect terminals 2 and 3 using a short wire.
terminals 2 and 3
terminals 1 and 9
terminals 4, 5 and 6
terminals 7 and 8
terminals B, Y and A
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