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8.B.:
1.7.
12.12. 12. Correct threshold
2.2 tin g
The following table lists series typical service conditions, help you understand and solve hypothetical faults malfunctions.1
9 LED (orange) flashing FN
12. 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. Select curve type "t=k"
4. Threshold too low
2.5).
2.4. 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. Connect the PR030/B unit
2 Trip times lower
than expected
1.7. PR030/B not connected
1.2 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.
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.2)
3. Threshold too high
2. 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.1
8 Unexpected trip See par.
1 cce sso rie s
12. Beforeconsulting the following table, checkforafewseconds forany optical signals provided bythe LEDs.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. FNindicates the normaloperation ofthe PR121/P. Send/communicate all the information collected, together with the circuit diagram for the circuit-breaker, your nearest ABB Customer Support
service. Correct threshold
2.
41/158
. Incorrect neutral selection
1. The test unit wired the relay dedicated connector (see ref. 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. Curve type "t= k/I2'
4.
1 it
The PR030/B power supply unit separate unit for powering the relay, auto test, trip test and checking with open.No.
N. Correct neutral adjustment
3 Trip times higher
than expected
1. Correct curve
3.5). 2
Page No. Correct curve
3.3 PR021/K and HMI030 units
The PR121/P can also connected the optional PR021/K external signalling unit (see par. Ifthe following suggestions failto solvethe problem, pleasecontacttheABBSACEcustomersupportservice.7. 12. 12. 12.
N itu tio ssib tio s
1 The trip test cannot run The busbar current 0
2. 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. Curve too high
3.
12. FN
2.1 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". Curve too low
3.
Model 2234 Apparatus Scale
L 2778
Doc.8. par. 12.
2.8.7. Check connection (see par. The not connected
3.
3
