L3447
Emax DC
76/108
L3728
Model
Scale
Page No.
Doc. No.
Apparatus
1SDH000635R0002
7 The display is not back-lit
Voltages below the
FN
limit for lighting the display
8 Reading of I incorrect
Current below the minimum threshold FN
that can be displayed
9
Reading of V or W incorrect
Voltage parameter setting error
Set correct parameters
10
"
Local Bus" message
No communication between
1. If not present, disable PR021/K,
on display
PR123/DC and PR021/K
see 13.5.4.2.4
2. Check bus connection
3. Check PR021/K
11
Message ""
Function disabled or data out of
FN
instead of expected data
range
12
The expected trip does not occur
Trip function disabled
FN enable trip if necessary
13
No activation of the Unbalance
Values of I out of range
FN, see 13.2.9.4
U protection
14
No display of the opening data
Vaux missing,the buffer capacitor
FN, see 13.5.6.1
is discharged
15
The password is not requested
The password has been disabled
FN, re-enter the password with a value
other than 0000
16
Impossible to change any parameter
PR123/DC in alarm situation
FN
17
"
Temp. sensor" or
Possible failure inside relay
Contact ABB Sace
"
Start-up" message
18
Invalid date
1. First installation
FN see 13.4.3.1
2. Information lost due to power
failure
19
Untimely trip
see 13.6.3
20
LED lighting
see 13.6.1
21
The language cannot be changed
1. Relay remotely set
1. Set locally
2. CB not open
2. Open CB
No.
Situation
Possible causes
Suggestions
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, Historicals Trip:
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.