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Monitoring Relays
3UG Monitoring Relays for Electrical and Additional Measurements
Current monitoring
72
Siemens · 2010
Wiring diagram for 24 V AC/DC (only 3UG46 2.-.AA30)
From the following circuit diagrams it is clear that loads in mea-
suring circuits have to be in the current flow upstream from the
monitoring relay. Otherwise, the monitoring relay could be de-
stroyed and the short-circuit current could cause damage to the
plant.
Configuring note:
A2 and M are electrically connected internally!
For applications in which the load to be monitored and the mon-
itoring relay are supplied from the same power supply, there is
no need for connection A2!
The load current must always flow through M or the monitoring
relay may be destroyed!
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NSB0_01199e
A2 M
A1
IN
M
Load
U
Load
AC/DC
Load
NSB0_01200e
A2 M
L1 L2
L3
IN A1
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o.k.
3UG3
24 V AC/DC
Load
o.k.
< >
A2 M
A1
IN
NSB0_01197e
Load
24 V AC/DC
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A2
A1
NSB0_01198e
o.k.
M
L1 L2 L3
IN
24 V AC/DC
Load