Cable Glands - Grundfos CRE Instrucciones De Instalación Y Funcionamiento

3.4.4 Additional protection
If the pump is connected to an electric installation where an
ground leakage circuit breaker (ELCB) is used as additional
protection, the circuit breaker must be of a type marked with the
following symbols:
This circuit breaker is type B.
The total leakage current of all the electrical equipment in the
installation must be taken into account.
For leakage current of the motor in normal operation, see section
8.1.3 Leakage current.
During start and at asymmetrical supply systems, the leakage
current can be higher than normal and may cause the ELCB to
trip.
3.4.5 Motor protection
The pump requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking (IEC 34-11, TP 211).
3.4.6 Protection against voltage transients
The pump is protected against voltage transients in accordance
with EN 61800-3 and is capable of withstanding a VDE 0160
pulse.
The pump has a replaceable varistor which is part of the transient
protection.
Over time this varistor will be worn and need to be replaced.
When the time for replacement has come, R100 and PC Tool E-
products will indicate this as a warning. See section
the product.
3.4.7 Supply voltage
3 x 460-480 V - 10 %/+ 10 %, 50/60 Hz, PE.
The supply voltage and frequency are marked on the pump
nameplate. Make sure that the motor 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.
Torques, terminals L1-L3:
Min. torque: 1.6 ft-lbs
Max. torque: 1.8 ft-lbs
Fig. 5 Power connection
8
ELCB
7. Servicing

Cable glands

Cable glands comply with EN 50626.
• 1 x M40 cable gland
• 1 x M20 cable gland
• 2 x M16 cable gland
• 2 x M16 knock-out cable entries.
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.
Could result in personal injury
– Do not connect three-phase E-pumps to a
power supply with a voltage between phase
and ground of more than 440 V.
3.4.8 Start/stop of pump
The number of starts and stops via the power supply
must not exceed 4 times per hour.
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.
3.4.9 Connections
If no external on-off switch is connected, connect
terminals 2 and 3 using a short wire.
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 terminals 2 and 3
• digital input terminals 1 and 9
• setpoint input terminals 4, 5 and 6
• sensor input terminals 7 and 8
• GENIbus terminals B, Y and A
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.