Signal Cables; Bus Connection Cable - Grundfos CRE Notice D'installation Et De Fonctionnement

4.2.6 Signal cables

• Use screened cables with a cross-sectional area of minimum
28 AWG and maximum 16 AWG 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. 10.
Fig. 10 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.
Connection of E-pump to Danfoss pressure sensor MBS3000
The blue wire of the pressure sensor is connected to the #4
terminal of the E-pump. The brown wire of the pressure sensor is
connected to the #8 terminal of the E-pump.
See section 4.2.6 Signal cables
14
for additional details.

4.2.7 Bus connection cable

New installations
For the bus connection, use a screened 3-core cable with a
cross-sectional area of minimum 28 AWG and maximum 16 AWG.
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 leave the screen unconnected at
this end. See fig. 11.
A
1
2
Y
3
B
Fig. 11 Connection with screened 3-core cable
Replacing a motor
• If a 2-core cable is used in the installation, connect it as shown
in fig. 12.
A
1
Y
2
B
Fig. 12 Connection with screened 2-core cable
• If a screened 3-core cable is used in the installation, follow the
instructions in section New installations.
Motor
A
1
2
Y
3
B
Motor
A
1
Y
2
B