Grundfos MGE Series - Signal cables; Bus connection cable

English (GB)
16
7.7 Signal cables
Use screened cables with a cross-sectional area of
minimum 0.5 mm
2
and maximum 1.5 mm
2
for the
external on/off switch, digital inputs, setpoint and
sensor signals.
Connect the screens of the cables to the frame at
both ends with good connection. The screens must
be as close as possible to the terminals. See fig. 13.
Fig. 13 Stripped cable with screen and wire
connections
Always tighten screws for frame connections
whether a cable is fitted or not.
The wires in the motor terminal box must be as short
as possible.
7.8 Bus connection cable
7.8.1 New installations
For the bus connection, use a screened 3-core cable
with a cross-sectional area of minimum 0.5 mm
2
and
maximum 1.5 mm
2
.
If the motor is connected to a unit with a cable clamp
which is identical to the one on the motor, connect
the screen to this cable clamp.
If the unit has no cable clamp as shown in fig. 14,
leave the screen unconnected at this end.
Fig. 14 Connection with screened 3-core cable
7.8.2 Replacing a motor
If you use a a screened 2-core cable in the
installation, connect it as shown in fig. 15.
Fig. 15 Connection with screened 2-core cable
If you use a screened 3-core cable in the installation,
follow the instructions in section 7.8.1 New
installations.
TM02 1325 4402
TM05 3973 1812TM02 8842 0904
A
Y
B
A
Y
B
1
2
3
1
2
3
Motor
A
Y
B
A
Y
B
1
2
1
2
Motor