Installation, connecting up, commissioning
3.3 Connecting up the device
LOGO! CMR2020, LOGO! CMR2040
42 Operating Instructions, 10/2016, C79000-G8976-C356-03
Power supply
Screw terminals for the power supply
L+ = live wire, positive pole of the DC voltage 12/24 VDC
M = negative pole/ground of the DC voltage 12/24 VDC
Functional ground
• Serves to improve electromagnetic compatibility and to specify a common reference poten-
tial for all signals.
• Is achieved efficiently by a connection to the DIN rail.
Note
Power supply unit of the CMR is not electrically isolated
No electrical isolation means that the input and output circuits are not galvanically isolated.
The CMR operates with a DC voltage of 12 to 24 VDC, nominally 24 VDC. The nominal
current consumption is a maximum of 250 mA at 12 V.
● Connect a suitable power supply to the screw terminals.
● Use copper wires only.
● Use only cables that are approved for at least 70 °C.
0.5 to 3 mm² (20 to 18 AWG)
Tightening torque for screw terminals:
Avoidance of sudden disconnection of the power supply
Avoid abrupt disconnection of the CMR from the power supply: In very seldom cases, the
CMR can be damaged.
Shut the CMR down to the safe status before turning the power supply off.
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