Rockwell Automation 140G-NTK-E12 LSIG and LSIG-MM Release - Manual (Page 11)

DIR 1000587R0002 (L3821)
(11)
2.6.2 Troubleshooting
The following table lists a series of typical service conditions, to help you understand and solve hypothetical faults or malfunctions.
N.B.:
1. Before consulting the following table, check for a few seconds for any optical signals provided by the LEDs.
2. FN indicates normal operation of the LSIG unit.
3. When the suggestions proposed do not lead to a solution of the problem, please contact AB assistance service.
No. Situation Possible causes Suggestions
1 Trip test cannot be run 1. Busbar current is > 0. 1. FN
2. The TC is not connected 2. Check TC connection (see par. 2.3.2)
3. Battery unit is disconnected 3. Connect battery unit.
2 Trip times lower 1. Threshold too low 1. Correct threshold
than expected 2. Curve too low 2. Correct curve
3. Incorrect neutral selection 3. Correct Neutral adjustment
3 Trip times higher 1. Threshold too high 1. Correct threshold
than expected 2. Curve too high 2. Correct curve
3. Curve type “t=k/I 2” 3. Select curve type “t=k”
4. Incorrect neutral selection 4. Correct Neutral adjustment
4 Rapid trip, with I3=Off Iinst tripped FN short-circuit with high I
5 Earth fault current beyond threshold, G function automatically inhibited FN
but no trip occurs
6 No expected trip Function OFF FN enable protection function if
necessary
7 Abnormal LED switch-on See par. 2.6.1
8 Unexpected trip See par. 2.6.1
9 L LED (orange) flashing FN
2.6.3 In case of a fault
If the LSIG is suspected of being faulty, there are signs of malfunctions or it has generated an unexpected trip, we advise you
to strictly follow the recommendations below:
1. Press “i Test” button (within 48 hours of opening the CB) and make a note of which LED is on, also recording type of CB, number of poles,
any connected accessories, In, and serial number (see par. 2.4).
2. Prepare a brief description of opening (when did it take place?, how many times?, was it always under the same conditions? what type of load?
what current? is the event reproducible?)
3. Send/communicate all information collected, together with CB circuit diagram, to your nearest AB Customer Assistance service.
Delivering comprehensive, accurate information to AB Assistance service will facilitate technical analysis of the problem encountered, and allow
us to promptly carry out all actions useful for the user.
2.7 Accessories
2.7.1 Battery unit
PR030/B power supply unit is a separate unit for powering relay, auto test and trip test, and checkings with open CB.