L2234
Emax
74/158
Model
Scale
Page No.
Doc. No.
Apparatus
1SDH000460R0002
L2778
13.7 Troubleshooting PR122/P unit
The following table lists a series of typical service conditions, to help you understand and solve hypothetical faults or malfunctions.
Note:
1. Before consulting the following table, check for any error messages appearing for some seconds on the display.
2. FN indicates the normal operation of the PR122/P.
3. In the case where the suggestions proposed do not lead to a solution of the problem, please contact the ABB SACE assistance service.
No. Situation Possible causes Suggestions
1 The trip test cannot be run 1. The busbar current is > 0. 1. FN
2. The TC is not connected 2. Check the messages on the display
3. CB open
2 Trip times lower than expected 1. Threshold too low 1. Correct threshold
2. Curve too low 2. Correct curve
3. Thermal memory enabled 3. Exclude if not necessary
4. Incorrect Neutral Selection 4. Correct neutral selection
5. The SdZ is inserted 5. Exclude if not necessary
3 Trip times higher than expected 1. Threshold too high 1. Correct threshold
2. Curve too high 2. Correct curve
3. Curve I
2
t inserted 3. Exclude if not necessary
4. Incorrect Neutral Selection 4. Correct neutral selection
4 Rapid trip, with I3=Off Iinst tripped FN with short-circuit with high I
5 High earth I, but no trip happens 1. Incorrect selection of the sensor 1. Set int. or ext. sensor
2. Function G prevented with I>4In 2. FN
6 Display off 1. Vaux missing and the current and/or 1. FN, see 13.2.2.1
voltages are below the minimum value.
2. Temperature out of range 2. FN, see 13.2.9.8
7 The display is not back-lit Current and/or volatges below the FN
limit for lighting the display
8 Reading of I incorrect Current below the minimum threshold FN
that can be displayed
9 Reading of V, W and power factor 1) Connection error between VT and 1) Check connections between VT and
incorrect PR120/V PR120/V
2) VT parameter settings error 2) Set the correct parameters
10 " Local Bus" message No communication between PR122/P 1. If not present, disable PR021/K,
on display and PR021/K see 13.5.4.4.5
2. Check bus connection
3. Check PR021/K
11 Message "" Function disabled or data FN
instead of expected data out of range
12 The expected trip does not occur Trip function disabled FN enable trip if necessary
13 No activation of the Unbalance Values of I out of range FN, see 13.2.9.5
U protection
14 No display Vaux missing, the buffer FN, see 13.5.6.1
of the opening data capacitor is discharged
15 The password is not requested The password has been disabled FN, re-enter the password with a value
other than 0000.
16 Impossible to change any PR122/P in alarm situation FN
parameter
17 " Temp. sensor" or Possible failure inside relay Contact ABB Sace
" Start-up" message
18 Invalid date 1.First installation FN see 13.4.3.1
2. Information lost due to power
failure
19 Untimely trip See 13.6.3
20 Led lighting See 13.6.1
21 The language cannot be changed 1. The relay is remotely set 1. Local setting
2. CB not open 2. Open CB
3. Vaux or PR120/V or PR030/V 3. Power the relay
not installed
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