Automatic Restart - Grundfos E Serie Instrucciones De Instalación Y Funcionamiento

5.3.5 Motor protection
The pump requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking (IEC 34-11, TP 211).
5.3.6 Protection against mains voltage transients
The pump is protected against voltage transients by built-in
varistors between the phases and between phases and earth.
5.3.7 Supply voltage and mains
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 earth conductor 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.
Fig. 7 Mains connection
Cable glands
Cable glands comply with EN 50626.
2 x M16 cable gland, cable diameter ∅4-∅10
•
1 x M20 cable gland, cable diameter ∅9-∅17
•
• 2 x M16 knock-out cable entries.
Warning
If the supply cable is damaged, it must be replaced
by qualified staff.
Grid types
Three-phase E-pumps can be connected to all grid types.
Warning
Do not connect three-phase E-pumps to a mains
supply with a voltage between phase and earth of
more than 440 V.
5.3.8 Start/stop of pump
Caution
When the pump is switched on via the mains, 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

Note
However, automatic restart only applies to fault types set up to
automatic restart. These faults could typically be one of these
faults:
L1
• temporary overload
L2
• fault in the power supply.
L3
5.3.9 Connections
Note
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 mains-
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.
Group 3: Mains supply (terminals L1, L2, L3)
Group 4: Communication cable (8-pin male socket) - only
TPED
The communication cable is connected to the socket in group 4.
The cable ensures communication between the two pumps,
whether one or two pressure sensors are connected. See section
5.7 Communication cable for TPED
The selector switch in group 4 enables changeover between the
operating modes "alternating operation" and "standby operation".
See description in section
TPED pumps.
The number of starts and stops via the mains voltage
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.
pumps.
6.2.1 Additional operating modes -
9