Rockwell Automation 140G-NTK-E12 LSIG and LSIG-MM Release User 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