User Manual

3UG4624 residual current monitoring relay
8.6 Circuit diagrams
3UG4 / 3RR2 monitoring relays
180 Manual, 02/2013, NEB927043002000/RS-AA/002
8.5.2 Reset
RESET
How the outputs are reset depends on the "Reset response" parameter (see Chapter "Reset
response (Page 351)").
The following settings can be selected:
● Automatic
reset (Memory = O / Mem = no)
The device is reset automatically as soon as a previously occurring error has been dealt
with.
● Manual RESET (Memory = I / Mem = yes)
To reset the devices with digital setting, it is necessary to press both arrow keys
simultaneously for more than 2.5 s after removal of the cause of error. If the cause of the
error has not been removed, a new error message appears immediately. Alternatively,
the devices can be reset by switching the rated control supply voltage on and off.
8.6 Circuit diagrams
8.6.1 Internal circuit diagrams
Internal circuit diagrams 3UG4624
Lx
Ly/N
8*
C1
C2
> I




Figure 8-1 3UG4624-.CS20 residual current relays, 90 to 690 V
Note
The device is suitable for cooperation with the summation current transformers 3UL22 for
external ground-fault monitoring. The output signal of the 3UL22 summation current
transformer is connected with terminals C1 and C2 of the monitoring relay. To avoid
interference injection, which could result in incorrect measurements, these connecting lines
must be routed as parallel as possible and twisted, or shielded cables must be used.