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No.
Situation
7
The display is not back-lit
8
Reading of I incorrect
9
Reading of V or W incorrect
10
"
Local Bus" message
on display
11
Message ""
instead of expected data
12
The expected trip does not occur
13
No activation of the Unbalance
U protection
14
No display of the opening data
15
The password is not requested
16
Impossible to change any parameter
17
"
Temp. sensor" or
"
Start-up" message
18
Invalid date
19
Untimely trip
20
LED lighting
21
The language cannot be changed
13.7.1 In the case of a fault
If you suspect that the PR123/DC is faulty, has a malfunction or has generated an unwanted trip, it is advisable to follow the
recommendations below very carefully from the Measurements menu,
1. Make a note of the type of protection that has tripped by accessing the LAST TRIP page if there is an external power supply (Vaux or battery)
or by pressing "i Test" if in self-powering mode.
2. Note down the type of circuit-breaker, number of poles, any accessories connected, In, Serial Number (see par. 13.4) and the SW version.
3. Prepare a brief description of the opening (what LEDs and/or indications were displayed? when did it happen?, how many times ?, was it
always under the same conditions? what type of load? what voltage? what current? is the event reproducible?)
4. Send/communicate all the information collected, together with the circuit diagram for the circuit-breaker, to your nearest ABB Customer Support
service.
The completeness and accuracy of the information given to the ABB Assistance service will facilitate technical analysis of the problem encountered,
and will allow us to carry out all actions useful for the user rapidly.
13.8
Accessories
13.8.1 ABB SACE PR010/T test and configuration unit
The test with the SACE PR010/T unit enables to check the proper operation of thresholds and tripping times of the protection functions L, S, I,
G, OV, UV, U. The test unit is connected to the relay by means of the dedicated connector (see par. 13.4).
13.8.2 BT030 communication unit
Through the BT030 wireless communication unit, the PR123/DC can be connected via wireless to a Pocket PC (PDA) or a standard PC, extending
the information range available to the user. Through the ABB SACE SD-Pocket communication software, the values of the currents flowing through
the CB, the value of the last 20 interrupted currents and protection settings, can be read.
13.8.3 PR021/K and HMI030 units
The PR123/DC can also be connected to the PR021/K optional external indication unit (see par. 15.1), to signal through potential-free power contacts,
the protection and trip alarms, and to the HMI030 switchboard front unit to display a number of information.
13.8.4 PR030/B power supply unit
This unit is an external unit allowing powering of Relay, Autotest and Trip Test, checking with CB open and installation of new replacement units.
L3447
Model
L3728
Possible causes
Voltages below the
limit for lighting the display
Current below the minimum threshold FN
that can be displayed
Voltage parameter setting error
No communication between
PR123/DC and PR021/K
Function disabled or data out of
range
Trip function disabled
Values of I out of range
Vaux missing,the buffer capacitor
is discharged
The password has been disabled
PR123/DC in alarm situation
Possible failure inside relay
1. First installation
2. Information lost due to power
failure
1. Relay remotely set
2. CB not open
Apparatus
Doc. No.
Suggestions
FN
Set correct parameters
1. If not present, disable PR021/K,
see 13.5.4.2.4
2. Check bus connection
3. Check PR021/K
FN
FN enable trip if necessary
FN, see 13.2.9.4
FN, see 13.5.6.1
FN, re-enter the password with a value
other than 0000
FN
Contact ABB Sace
FN see 13.4.3.1
see 13.6.3
see 13.6.1
1. Set locally
2. Open CB
Historicals
Trip:
Emax DC
1SDH000635R0002
Scale
Page No.
76/108
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Table of Contents
Troubleshooting
