7
3.5.5 Overvoltage protection
The pump is overvoltage-protected through built-in varistors
between the phases and between phases and earth.
3.5.6 Supply voltage
3 x 380-480 V +-10 %, 50/60 Hz, PE.
3 x 208-230 V +-10 %, 50/60 Hz, PE.
The supply voltage and frequency are marked on the pump
nameplate. Please make sure that the pump is suitable for the
electricity supply on which it will be used.
The wires in the pump 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.
For maximum back-up fuse, see section
Fig. 6
Example of a mains-connected pump with mains
switch, back-up fuses and additional protection
Fig. 7
Mains connection
3.5.7 Start/stop of pump
The number of starts and stops via the mains voltage must not
exceed 4 times per hour.
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, the input for
external start/stop must be used when starting/stopping the
pump.
When the pump is started/stopped via an external on/off switch, it
will start immediately.
3.6 Other connections
The connection terminals of external potential-free contacts for
start/stop and digital function, external setpoint signal, sensor
signal, GENIbus and relay signal are shown in fig. 8.
1.
Inputs
(external start/stop, digital function, setpoint and
sensor signals, terminals 1-9, and bus connection, terminals
B, Y, 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 by protective extra-low
voltage (PELV), thus ensuring protection against electric
shock.
2.
Output
(relay signal, terminals NC, C, NO).
The output (group 2) is galvanically separated from other
circuits. A maximum supply voltage of 250 V or protective
extra-low voltage can be connected to the output as desired.
3.
Mains supply
(terminals L1, L2, L3, PE).
A galvanically safe separation must fulfil the requirements for
reinforced insulation including creepage distances and
clearances specified in EN 60 335.
Fig. 8
Connection terminals
TM
00
9
270
46
96
TM0
2
8
5
11
03
04
If the supply cable is damaged, it must be
replaced by the manufacturer, the manufacturer's
service partner or similarly qualified persons in
order to avoid a hazard.
L1
L2
L3
L2
L1
L3
PE
ELCB
MGE 90 to MGE 132
PE
L3
L2
L1
Note
If no external on/off switch is connected, short-
circuit 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:
T
M
02
84
14
51
03
1 9 8 7
B Y A
0-10 V
0/4-20 mA
4-20 mA
1/0
NC C NO
L1 L2 L3
10K
RUN
STOP
6 5 4 3 2
0/4-20 mA
0-10 V
Gro
u
p
2
G
rou
p 3
G
rou
p 1
1: Digital input
9: GND (frame)
8: +24 V
7: Sensor input
B: RS-485B
Y: Screen
A: RS-485A
6: GND (frame)
5: +10 V
4: Setpoint input
3: GND (frame)
2: Start/stop
Grundfos.bk Page 7 Tuesday, April 17, 2007 8:54 AM
