Specifications

L2234
L2778
L4681
L5179
Emax
81/161
Doc. No
Model
Apparatus
Scale
Page No
1SDH000460R0002
L5439
N° Situation Possible causes Suggestions
8 Reading of V, W and power
factor
Current below the minimum threshold that
can be displayed
FN
9 Reading of V, W and power fac-
tor incorrect
1. Connection error between VT and
PR120/V
2. VT parameter settings error
1. Check connections between VT and
PR120/V
2. Set the correct parameters
10
“
Local Bus” message on
display
No communication between PR122/P
and PR021/K
1. If not present, disable PR021/K, see
13.5.4.4.5
2. Check bus connection
3. Check PR021/K
11 Message " "
instead of expected data
Function disabled or data or out of range FN
12 The expected trip does not occur Trip function disabled FN enable trip if necessary
13 No activation of the Unbalance U
protection
Values of I out of range FN, see 13.2.9.5
14 No display of the opening data Vaux missing, the buffer capacitor is dis-
charged
FN, see 13.5.6.1
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 pa-
rameter
PR122/P in alarm situation FN
17
“ Temp. sensor" or
"
Start-up" message
Possible failure inside relay Contact ABB Sace
18 Invalid date 1. First installation
2. Information lost due to power failure
FN see 13.4.3.1
19 Untimely trip see 13.6.3
20 Led lighting see 13.6.1
21 The language cannot be
changed
1. The relay is remotely set
2. CB not open
3. Vaux or PR120/V or PR030/B not installed
1. Local settings
2. Open CB
3. Power the relay
13.7.1. In the case of a fault
WARNING: If you suspect that the PR122/P is faulty, if 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-supply 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.
WARNING: Letting a switch run with a fault that has not been remedied may lead to an apparatus malfunction
or shutdown. Remove the apparatus immediately until it can be inspected or repaired if this situation may lead
to personal injury, damage or is otherwise critical.
13.8. Accessories
13.8.1. ABB SACE PR010/T test and configuration unit
Testing by the SACE PR010/T unit allows checking correct operation of thresholds and trip times of “L”, “S”, “I”, “G”, OV, UV, RV,
U protection functions. The test unit is connected to the relay through a dedicated connector (see par. 13.4).
13.8.2. BT030 USB communication unit
Through the BT030 USB wireless communication unit, the PR122/P can be connected via wireless to a PC, extending the infor-
mation range available to the user.
13.8.3. PR021/K and HMI030 units
The PR122/P can also be connected to the optional external PR021/K unit (see par. 16) to indicate through potential-free power
contacts alarms and protection trips, and to the HMI030 switchboard front unit to display a number of information.
13.8.4. PR030/B power supply unit
The PR122/P can also be connected to the optional external PR021/K unit (see par. 16) to indicate through potential-free power
contacts alarms and protection trips, and to the HMI030 switchboard front unit to display a number of information.
13.8.5. Flex interface
Flex interfaces are electronic modules with analogue and/or digital inputs and outputs that can be fitted on a DIN guide. They can
be connected to the supervision system or to the electronic release by internal bus or external bus (see par.16.6).