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Select curve type "t=k"
4.1
8 Unexpected trip See par. Correct curve
3. 12.2 tin g
The following table lists series typical service conditions, help you understand and solve hypothetical faults malfunctions. Curve type "t= k/I2'
4. FNindicates the normaloperation ofthe PR121/P.2)
3. 2
Page No.
12.4.1
9 LED (orange) flashing FN
12. Send/communicate all the information collected, together with the circuit diagram for the circuit-breaker, your nearest ABB Customer Support
service. Connect the PR030/B unit
2 Trip times lower
than expected
1.
1 cce sso rie s
12. Curve too high
3.
2. Correct curve
3. fact, using the SD-Pocket communication software ABB SACE, you can read the values of
the currents flowing through the circuit-breaker, the value the last currents broken and the protection settings. 12.
2. Ifthe following suggestions failto solvethe problem, pleasecontacttheABBSACEcustomersupportservice. Correct threshold
2.7.3 PR021/K and HMI030 units
The PR121/P can also connected the optional PR021/K external signalling unit (see par.3 the case fault
A
If the PR121/P suspected being faulty, there are signs alfunctions has generated unexpected trip, advise
you strictly follow the recom endations below :
1. Incorrect neutral selection
1.1 ABB SACE PR010/T test and configuration unit
Testing with the SACE PR010/T unit enables you monitor the proper operation thresholds and trip times the protection functions "L", "S",
"I", and "G".
12. FN
2.
Model 2234 Apparatus Scale
L 2778
Doc.5).8.
1 it
The PR030/B power supply unit separate unit for powering the relay, auto test, trip test and checking with open.
3. Threshold too low
2.:
1. PR030/B not connected
1. 12. Prepare brief description the opening (what LEDs were displayed?, when did happen?, how many times?, was always under the same
conditions? what type load? what current? the event reproducible?)
3.
41/158
.12.
N.8.
The more the information given the ABB Customer Support service complete and accurate, the easier the technical analysis the problem
encountered will be, enabling take all action help the user without delay.5).7.8. Correct neutral adjustment
4 Rapid trip, with Off Iinst tripped short-circuit with high I
5 Earth fault current beyond threshold
but trip occurs
G function automatically inhibited FN
6 Expected trip does not happen Function OFF enable protection function
if necessary
7 LEDs irregularly turned See par.
N itu tio ssib tio s
1 The trip test cannot run The busbar current 0
2. Beforeconsulting the following table, checkforafewseconds forany optical signals provided bythe LEDs. Curve too low
3.No. Correct threshold
2. 12.B.7. The test unit wired the relay dedicated connector (see ref. 12. The not connected
3. Press the Test" button (within hours opening the CB) and make note which LED on, also recording the type ofCB, thenumber
of poles, any connected accessories, the In, and the serial number (see par. Correct neutral adjustment
3 Trip times higher
than expected
1.7. 16), for the signalling means no-potential power
contacts alarms and tripped protections, and the HMI030 switchboard front unit view various kinds information the display. Threshold too high
2.2 BT030 com unication unit
Using the BT030 wireless communication unit, the PR121/P can connected radio hand-held (PDA) normal PC, thus extending
the amount information available the user. Check connection (see par. Incorrect neutral selection
1. par
