Connecting The Signal Terminals - Grundfos CUE Series Installation And Operating Instructions Manual

6.3 Connecting the signal terminals

As a precaution, signal cables must be separated
Caution from other groups by reinforced insulation in
their entire lengths.
If no external on/off switch is connected, short-
Note
circuit terminals 18 and 20 using a short wire.
Connect the signal cables according to the guidelines for good
practice to ensure EMC-correct installation. See section
6.6 EMC-correct installation.
• Use screened signal cables with a conductor cross-section of
2
min. 0.5 mm and max. 1.5 mm
• Use a 3-conductor screened bus cable in new systems.
6.3.1 Wiring diagram, signal terminals
0/4-20 mA
0-10 V
1 K
Fig. 17 Wiring diagram, signal terminals
Terminal Type Function
12 +24 V out Supply to sensor
13 +24 V out Additional supply
18 DI 1 Digital input, start/stop
19 DI 2 Digital input, programmable
20 GND Common frame for digital inputs
32 DI 3 Digital input, programmable
33 DI 4 Digital input, programmable
39 GND Frame for analog output
42 AO 1 Analog output, 0-20 mA
50 +10 V out Supply to potentiometer
53 AI 1 External setpoint, 0-10 V/4-20 mA
54 AI 2 Sensor input, sensor 1, 0/4-20 mA
55 GND Common frame for analog inputs
61 RS-485 GND Y GENIbus, GND
68 RS-485 A GENIbus, signal A (+)
69 RS-485 B GENIbus, signal B (-)
Terminals 27, 29 and 37 are not used.
Note The RS-485 screen must be connected to frame.
2
.
0/4-20 mA
Terminals
53 and 54:
0-10 V
See section
6.3.5
6.3.2 Minimum connection, signal terminals
Operation is only possible when the terminals 18 and 20 are
connected, for instance by means of an external on/off switch or a
short wire.
Fig. 18 Required minimum connection, signal terminals
6.3.3 Access to signal terminals
All terminals for signal cables are located beneath the control
panel and can be accessed by opening the door of the CUE.
See fig. 19.
Signal terminals
Fig. 19 Signal cable routing
6.3.4 Fitting the conductor
1. Remove the insulation at a length of 9-10 mm.
2. Insert a screwdriver with a tip of maximum 0.4 x 2.5 mm into
the square hole.
3. Insert the conductor into the corresponding round hole.
Remove the screwdriver. The conductor is now fixed in the
terminal.
Fig. 20 Fitting the conductor into the signal terminal
Signal relays
9