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7.8.7.
2. 12.3 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. Curve too high
3.B.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. Correct neutral adjustment
3 Trip times higher
than expected
1. Connect the PR030/B unit
2 Trip times lower
than expected
1. Ifthe following suggestions failto solvethe problem, pleasecontacttheABBSACEcustomersupportservice.12. Threshold too low
2.2)
3.
12. The not connected
3.1 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". 12.1
9 LED (orange) flashing FN
12. 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. 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. par.8.:
1. Correct curve
3. The test unit wired the relay dedicated connector (see ref.5).3 PR021/K and HMI030 units
The PR121/P can also connected the optional PR021/K external signalling unit (see par. Check connection (see par.
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.8. 12. 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.7.4.
1 it
The PR030/B power supply unit separate unit for powering the relay, auto test, trip test and checking with open.
2.7. Select curve type "t=k"
4.
1 cce sso rie s
12. 2
Page No. 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. FN
2. 12. Beforeconsulting the following table, checkforafewseconds forany optical signals provided bythe LEDs. Correct threshold
2.
N itu tio ssib tio s
1 The trip test cannot run The busbar current 0
2.
N.
3. Curve too low
3.5). Correct threshold
2.
Model 2234 Apparatus Scale
L 2778
Doc.1
8 Unexpected trip See par. Incorrect neutral selection
1. Incorrect neutral selection
1. Threshold too high
2. PR030/B not connected
1.
41/158
.
12. FNindicates the normaloperation ofthe PR121/P.2 tin g
The following table lists series typical service conditions, help you understand and solve hypothetical faults malfunctions. Correct curve
3. Send/communicate all the information collected, together with the circuit diagram for the circuit-breaker, your nearest ABB Customer Support
service. 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. 12.No
