User Manual

3UG458. insulation monitoring relay.
10.3 3UG4581 insulation monitoring relay
3UG4 / 3RR2 monitoring relays
Manual, 02/2013, NEB927043002000/RS-AA/002
215
Carrying out the self-test
The test function is only possible if there is no fault.
By operating the combined test/reset button, the insulation monitoring relay goes through an
internal test that checks the proper functioning of the operational device.
The output relays do not pick up or they switch to the fault status while the Test/Reset button
is pressed, while control contact Y1-Y3 is closed, or while the test functions execute after
application of the supply voltage. The test function can be started again at any time via the
Test/Reset button on the front or via a remote test button. The graphic below shows the
connection of the button for the remote test.
<
<
<
Figure 10-1 Remote test button
10.3.4 Diagnostics
10.3.4.1 Diagnostics with LEDs
Status display
The following information indicates the operating state on the 3UG4581 insulation monitoring
relays:
Operating state LED (green) LED F (red) LED (yellow)
Self-test (after U
S
= on)
Off Off
No fault Off
Insulation fault
(threshold undershot)
Off
Measured result invalid Off
Internal fault Off Off
Test function active Off Off
Manual RESET
possible
1)
2)
1)
The device has tripped following an insulation fault. The fault has been stored and the insulation
resistance has reverted to a value above the set threshold including hysteresis.
2)
Dependent on the fault.
The switching behavior of the output relay is shown in Chapter "Functions (Page 210)".