Power Supply - Siemens LOGO! CMR2040 Operating Instructions Manual

Installation, connecting up, commissioning
3.3 Connecting up the device
3.3.4

Power supply

Screw terminals for the power supply
①
②
③
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.
Wire:
Stranded wire:
Tightening torque for screw terminals:
Turning off the CMR
NOTICE
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.
42
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.
•
0.5 to 3 mm² (20 to 18 AWG)
0.5 to 2.5 mm²
0.6 to 0.8 Nm
LOGO! CMR2020,
Operating Instructions, 10/2016, C79000-G8976-C356-03
LOGO! CMR2040