Product Manual

CU331SP variable frequency drive
SQ, SQE, CU 331, and SP
10
44
Connecting the signal terminals
As a precaution, signal cables must be separated from
other groups by reinforced insulation in their entire
lengths.
If no external on/off switch is connected, short-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 EMC-correct installation on page 46.
• Use screened signal cables with a conductor cross-
section of min. AWG 20 (0.5 mm
2
) and max. AWG
16 (1.5 mm
2
).
• Use a 3-conductor screened bus cable in new
systems.
Minimum connection, signal terminal
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. 35 Required minimum connection, signal terminal
Fig. 36 Wiring diagram for CU331SP
Fig. 37 Sensor wiring diagram
TM03 9057 3207
Start/stop
GND
Jumper wire
TM05 5802 3913
TM05 6776 5112
0/4-20 mA
Terminals
Sensor 1
GND
GND
+24 V out Start/stop
RS-485 GND Y
RS-485 B
RS-485 A
Switch position
must be
changed to "I"
prior to startup
Jumper wire