User Manual

SIRIUS 3RU2/3RB3 overload relays
5.8 Operation
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
521
Test function for the 3RB30/3RB31 solid-state overload relay
The correct function of the relay when ready for operation can be checked by pressing the
TEST button with the motor current flowing (device/electronics test). Current sensing, the
motor model, and the tripping unit are tested. If these components are OK, the device is
tripped in accordance with the table below. In the event of an error, the device is not tripped.
Tripping class Required loading with
the rated current prior to
pressing the TEST button
Tripping within
CLASS 5 3 min 30 s
CLASS 10 5 min 1 min
CLASS 20 10 mins 2 mins
CLASS 30 15 mins 3 min
Note
The TEST button must be held down throughout the test. In this case the motor current must
be > 80% of the current setting I
e
and equal to at least the value of the lower current setting.
The switch position indicator slide can be used to test the auxiliary contacts and the control
current wiring. The tripping of the relay can be simulated by moving the slide. This simulation
process opens the NC contact and closes the NO contact, thereby checking that the auxiliary
circuit has been wired correctly. The relay is reset after a test trip by pressing the RESET
button.
The user test has been completed successfully if:
● The device trips within the maximum permissible time and
● Contact 95-96 is open (test for welding)