Signal Cables; E-Pump Electrical Connections - Grundfos CRE Instrucciones De Instalación Y Funcionamiento

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: Power supply (terminals L1, L2, L3)
Fig. 6 Connection terminals
A galvanic separation must fulfill the requirements for reinforced
insulation including creepage distances and clearances specified
in EN 61800-5-1.
20: PT 100 B
19: PT 100 B
18: PT 100 A
17: PT 100 A
16: GND (frame)
15: +24 V
14: Sensor input 2
13: GND
12: Analog output
11: Digital input 4
10: Digital input 3
1: Digital input 2
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

3.4.10 Signal cables

• Use screened cables with a conductor cross-section of min.
28 AWG and max. 16 AWG for external on/off switch, digital
input, setpoint and sensor signals.
• Connect the screens of the cables to frame at both ends with
good frame connection. The screens must be as close as
possible to the terminals. See fig. 7.
Fig. 7 Stripped cable with screen and wire connection
• Always tighten screws for frame connections whether a cable
is fitted or not.
• Make the wires in the pump terminal box as short as possible.

3.5 E-pump electrical connections

3.5.1 Connection of E-pump to Danfoss pressure sensor
MBS3000
The blue wire of the pressure sensor is connected to the #7
terminal of the E-pump. The brown wire of the pressure sensor is
connected to the #8 terminal of the E-pump.
See section 3.4.10 Signal cables
Fig. 8 Danfoss pressure sensor
for additional details.
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