ABB SACE Emax Series Installation, Service And Maintenance Instructions

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ABB SACE Emax Series Installation, Service And Maintenance Instructions Manual pdf 42 page image

L2234L2778 Emax41/158Model ScalePage No.Doc. No.Apparatus1SDH000460R000212.7.2 TroubleshootingThe 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 a few seconds for any optical signals provided by the LEDs.2. FN indicates the normal operation of the PR121/P.3. If the following suggestions fail to solve the problem, please contact the ABB SACE customer support service.N o . Situation Possible causes Suggestions1 The trip test cannot be run 1. The busbar current is > 0 1. FN2. The TC is not connected 2. Check TC connection (see par. 12.4.2)3. PR030/B is not connected 3. Connect the PR030/B unit2 Trip times lower 1. Threshold too low 1. Correct thresholdthan expected 2. Curve too low 2. Correct curve3. Incorrect neutral selection 3. Correct neutral adjustment3 Trip times higher 1. Threshold too high 1. Correct thresholdthan expected 2. Curve too high 2. Correct curve3. Curve type "t=k/I2" 3. Select curve type "t=k"4. Incorrect neutral selection 4. Correct neutral adjustment4 Rapid trip, with I3=Off Iinst tripped FN short-circuit with high I5 Earth fault current beyond threshold G function automatically inhibited FNbut no trip occurs6 Expected trip does not happen Function OFF FN enable protection functionif necessary7 LEDs irregularly turned on See par. 12.7.18 Unexpected trip See par. 12.7.19 L LED (orange) flashing FN12.7.3 In the case of a faultIf the PR121/P is suspected of being faulty, there are signs of malfunctions or it has generated an unexpected trip, we adviseyou to strictly follow the recommendations below:1. Press the "i Test" button (within 48 hours of opening the CB) and make a note of which LED is on, also recording the type of CB, the numberof poles, any connected accessories, the In, and the serial number (see par. 12.5).2. Prepare a brief description of the opening (what LEDs were displayed?, when did it happen?, how many times?, was it always under the sameconditions? what type of load? what current? is the event reproducible?)3. Send/communicate all the information collected, together with the circuit diagram for the circuit-breaker, to your nearest ABB Customer Supportservice.The more the information given to the ABB Customer Support service is complete and accurate, the easier the technical analysis on the problemencountered will be, enabling us to take all action to help the user without delay.12.8 Accessories12.8.1 ABB SACE PR010/T test and configuration unitTesting with the SACE PR010/T unit enables you to monitor the proper operation of thresholds and trip times of the protection functions "L", "S","I", and "G". The test unit is wired to the relay by a dedicated connector (see ref. 26 par. 12.5).12.8.2 BT030 communication unitUsing the BT030 wireless communication unit, the PR121/P can be connected by radio to a hand-held PC (PDA) or normal PC, thus extendingthe amount of information available to the user. In fact, using the SD-Pocket communication software by ABB SACE, you can read the values ofthe currents flowing through the circuit-breaker, the value of the last 20 currents broken and the protection settings.12.8.3 PR021/K and HMI030 unitsThe PR121/P can also be connected to the optional PR021/K external signalling unit (see par. 16), for the signalling by means of no-potential powercontacts of alarms and tripped protections, and to the HMI030 switchboard front unit to view various kinds of information on the display.1 2 . 8 . 4 PR030/B power supply unitThe PR030/B power supply unit is a separate unit for powering the relay, auto test, trip test and checking with CB open.