ABB CL Series Applications Manual page 46

1SVC 440 795 M0100
Power supply of CL-AC1 devices and analog inputs
With CL-AC1 devices that process analog signals, the device
must be fed via a transformer so that the device is isolated
from the mains supply. The neutral conductor and the
reference potential of the DC power feed of analog sensors
must be electrically connected.
h
Ensure that the common reference potential is grounded
or monitored by a ground fault monitoring device. Observe
the requirements of the relevant regulations.
L
N
F1
L
Figure 19: CL-AC1 analog input, connection of reference potentials
Connecting the inputs
CL-LAS.SD001
~
EASY200-POW
0 V
L01h
N01 h
N N I1
+12 V
I7 I8
43