L3016
1SDH000559R0002
52/52
ABB SACE
SACE PR021/K
6. Troubleshooting
The following table details a range of typical operational situations, useful to understand and solve presumed faults and
malfunctions.
N.B.:
•
Before consulting the following table, check the LEDs on the front panel of the PR021/K unit for several seconds
(wait until the end of the start up phase if the unit has just been switched on).
•
FN indicates normal operation.
6.1.
In case of fault
If the suggestions provided in the table do not solve the problems, and/or if the PR021/K unit is presumed to be faulty,
malfunctioning or has generated unexpected commands, we recommend that the instructions below are strictly complied
with:
•
Prepare a brief description of the problem (when did it occur? how many times? can the event be reproduced? how?
etc.). Note type of load connected to the signalling unit (lamps, signalling relays, remote switches, contactors, sirens,
etc.), serial number of the unit, etc. (see par. 5.3.2).
•
Send all information gathered, complete with the application circuit diagram, to the nearest ABB SACE technical
support.
The more complete and accurate the information supplied to ABB technical support, the easier it will be to analyze the
problem encountered, thus permitting the client to receive prompt and accurate service.
No.
Situation
Possible causes
Suggestions
1. The PR021/K unit is in
"Stand-by" operating mode.
1.
Set the dip-sw "K51/ " to "EN.", then
press the "Reset" push-button on the front panel
of the PR021/K unit.
7
The "PW/WD" LED is
steadily lit red.
Irregular situation.
Contact ABB SACE.
8
The "PW/WD" LED is
flashing red.
PR021/K in programming mode.
Check the "PROG." dip-switch.
1
Relays do not switch, even
under the conditions required
for switching (for example, an
overload with L protection
function).
2
The unit does not update
signals.
3
The signals cannot be reset
after a protection release trip,
despite pressing the reset
push-button.
The connected protection unit is a PR112
or PR113, and availability of the PR021/K
unit has not been set up.
4
"Tx/Rx" flashing and/or relay
K51/5 switching (bus KO)
discontinued.
5
The "Tx/Rx" LED flashes
once or more (from 1 to 4
times) with a duration of
200ms and a repetition period
of 2s (see par. 3.2).
6
The "Tx/Rx" LED is off.
2.
The unit has not been
reset
2. Local bus communication is
interrupted (see par. 3.2).
1. The unit has not been
reset
2. Reset.
1. Press the reset push-button on the front panel of the unit.
1. Wiring error.
2. Aux voltage failure.
3. PR021/K in programming mode.
2. Check connections.
• Set the PR021/K unit to On in the menu of the protection
unit.
• Press the RESET push-button on the front panel of the
PR112 or PR113 unit.
• Send a "Trip Reset " command from the remote supervision
system.
1. Bus conflict (2 masters).
2. Detective connection.
1. Unit with "Self-test" function enabled.
2. PR021/K unit in Stand-by mode.
3. Connected protection unit not
recognized.
4. Communication problems (bus KO).
1. FN.
2. FN.
3. Remove Vaux from PR021/K unit and from the protection
unit, then re-power the two units simultaneously.
4. Check connections, communication rate setting ("BAUD"
dip-switch) and mode ("MODE" dip-switch).
1. Check connections.
2. Restore supply voltage.
3. Check the "PROG." dip-switch.
1. Set the "MODE" dip-sw to "SLAVE".
2. Check connections.
