Rockwell Automation 140G-NTK-E12 LSIG and LSIG-MM Release - Manual (Page 31)

DIR 1000587R0002 (L3821)
(31)
3.6 Troubleshooting LSIG-MM units
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 any error messages appearing for some seconds on the display.
2. FN indicates normal operation of the release.
3. When the suggestions proposed do not lead to a solution of the problem, please contact ABB SACE 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 messages on the display
2 Trip times lower 1. Threshold too low 1. Correct threshold
than expected 2. Curve too low 2. Correct curve
3. Thermal memory enabled 3. Exclude if not necessary
4. Incorrect neutral selection 4. Correct Neutral selection
3 Trip times higher 1. Threshold too high 1. Correct threshold
than expected 2. Curve too high 2. Correct curve
3. Curve I 2 t enabled 3. Exclude if not necessary
4. Incorrect neutral selection 4. Correct Neutral selection
4 Rapid trip, with I3=Off Iinst tripped FN short-circuit with high I
5 High earth fault current value, 1. Incorrect selection of sensor 1. Set int. or ext. sensor
but no trip takes place 2. Function G prevented with I>4 In 2. FN
6 Display off 1 No Vaux and current and/or 1. FN, see 3.1.2.1
voltage is below the minimum value.
2. Temperature off-range 2. FN, see 3.1.9.6
7 The display is not back-lit Current and/or voltages below the FN
limit for lighting the display
8 Reading of I incorrect Current below the minimum FN
threshold that can be displayed
9 Message “” Function disabled or data off-range FN
instead of expected data
10 Expected trip does not take place Trip function disabled FN enable trip if necessary
11 No activation of protection Values of I out of range FN, see 3.1.9.3
Unbalance U
12 No display of No Vaux , buffer capacitor FN, see 3.4.6.1
opening data is discharged
13 The password is not requested The password has been disabled FN, re-enter the password with a value
other than 0000
14 Impossible to change any Release in an alarm situation FN
parameter
15 Message “ Temp. Sensor” or Possible fault inside the relay Contact AB
“ Start-up”
18 Invalid Date 1. First installation FN see 3.3.3.
2. Information lost due to power
failure
19 Untimely trip see 3.5.2
20 LED lighting see 3.5.1
21 No possibility to change 1. Relay is remotely set 1. Set to local
language 2. The CB is not open 2. Open CB
3. Vaux or battery unit 3. Power the relay