L2275
Emax UL
33/132
Doc. N°
Mod.
RH0109002
Apparatus
Scale
Page N°
12.10
Troubleshooting
The following table collects up a series of typical service situations, which are useful in order to understand and solve hypothetical faults
or malfunctions.
N.B.:
1.
Before consulting the following table, check any lighting up of the LEDs located on the front of the unit for some seconds.
2.
FN indicates normal operation of the PR111.
3.
In the case where the suggestions proposed do not lead to a solution of the problem, please contact the ABB SACE service assistance.
N°
Situation
Possible causes
Suggestions
1
It is not possible to carry out the trip test
1. The busbar current is > 0.
1. FN
2. The SA is not connected
2. Check the SA cabling
3. TT1 device battery flat
3. Replace the battery inside the TT1
2
Trip times lower than those
1. Threshold too low
1. Correct the threshold
expected
2. Curve too low
2. Correct the curve
3. Incorrect Neutral selection
4. Correct the Neutral Selection
3
Trip times higher than
1. Threshold too high
1. Correct the threshold
those expected
2. Curve too high
2. Correct the curve
3. Curve I
2
t inserted
3. Exclude if not necessary
4. Incorrect Neutral selection
4. Correct the Neutral Selection
4
Rapid trip, with I3=Off
Iinst trip
FN with short circuit with high I
5
Earth I high, but there is no trip
Function G prevented with I>4 In
FN
6
It is not possible to modify any parameter PR111 in alarm situation
FN
12.10.1 In the case of a fault
If it is suspected that the PR111 is faulty, shows malfunctions or has generated an unexpected trip, we recommend you strictly follow the indications
below:
1. Note all the protection function settings.
2. Mark the type of power circuit breaker, number of poles, In and Serial Number (see Fig. 36)
3. Prepare a brief description of the opening (when did it happen? how many times? always under the same conditions? with what type of load?
with what current? can the event be reproduced?)
4. Send/communicate all the information collected, together with the applicative circuit diagram of the power circuit breaker, to your nearest ABB
Assistance.
The completeness and the accuracy of the information supplied to ABB Assistance will facilitate the technical analysis of the problem encountered,
and will allow us to rapidly take all the useful measures to help the user.
12.11
Accessories
12.11.1 ABB SACE TT1 simple test unit
The SACE TT1 device is a test unit to be inserted in the special front TEST connector of the PR111 (see ref. G Figure 36). With this accessory,
supplied as standard, it is possible carry out the opening test of the power circuit breaker (“Trip test”) (see 12.8.3).
The unit is fitted with a 12V battery and does not therefore require any external power supply.
The item has two pushbuttons (one for PRESET and the other for TRIP) and an LED (READY) indication.
The accessory operates in the following way:
•
Press the PRESET pushbutton and wait for the READY LED to light up
•
Position the TT1 in the protection unit
•
Within 30s from the PRESET operation press the TRIP pushbutton.
•
Check the opening of the power circuit breaker.
When the READY LED does not light up it means that either the battery is flat or that the TT1 is faulty.
12.11.2 ABB SACE PR010/T complex test unit
By means of a cable connected to the front TEST connector of the PR111 (see ref. H Figure 36), the test with the SACE PR010/T unit allows correct
operation of the inputs, outputs, thresholds and trip times of protection functions “L”, “S”, “I”, “G” and “Iinst” to be checked manually or automatically.
It is also possible to obtain a test report which can be downloaded to a PC.
For operation of the PR010/T accessory, please consult the special instruction manual.
