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Troubleshooting and Maintenance
Name
Inputs.
+24 Vdc.
R, S, T.
Pre-charge.
Temperature.
RL outputs.
RL1.
RL2.
RL3.
LEDs.
12 V ON.
UDC_1 OK.
UDC_2 OK.
TEMP _ ALARM.
TEMP _ FAULT.
Inputs
+24 Vdc
R, S, T
Pre-charge Temperature RL1 RL2 RL3
OK
OFF
OK
OK
OK
OK
OK
Phase fault
undervoltage.
OK
OK
OK
OK
OK
OK
OFF
(5)
OK
OK
5
Note:
(1) Temporary operation condition.
(2) Phase fault / undervoltage / defective rectifier bridge 1 - refer to
(3) Phase fault / undervoltage / defective rectifier bridge 2 - refer to
(4) The monitoring temperatures are:
- High temperature alarm: active with T
- Overtemperature fault: active with T
- Undertemperature fault: active with T
(5) The input state is not decisive for the outputs state.
5-2 | UR11
Table 5.1 - Operation of faults and alarms
+24 Vdc power supply of the CIR11 board.
R1, S1, T1, R2, S2 and T2 input power connections.
Pre-charge status: "Not-performed", "In progress" or "Completed".
UR11 heatsink temperature measured through the NTCs.
Relay output with the pre-charge status indication function (UDC1_OK & UDC2_OK). It closes when the two
UR11 rectifier diode bridges completed the pre-charge.
Output relay with "No Temperature Alarm" function. It opens under alarm condition.
Output relay with "No Temperature Fault" function. It opens under fault condition.
Green LED with +12 V ON power supply indication, generated at CIR11 from the + 24 Vdc.
Green LED with status function indication of one UR11 input rectifier bridge - it lights when its pre-charge is
completed.
Green LED with status function indication of the other UR11 input rectifier bridge - it lights when its pre-charge
is completed.
Yellow LED that lights when the UR11 temperature is too high (alarm).
Red LED that lights under overtemperature or undertemperature fault condition
Table 5.2 - Faults, alarms and possible causes
Outputs
OFF
T
≤ T ≤ T
OFF ON ON
MIN
AL
In progress
T
≤ T ≤ T
OFF ON ON
MIN
AL
(1)
Completed T
≤ T ≤ T
ON ON ON
MIN
AL
OFF
T
≤ T ≤ T
OFF ON ON
MIN
AL
OFF
T
≤ T ≤ T
OFF ON ON
MIN
AL
Completed
T
< T
ON OFF ON
(4)
AL
OFF
T
< T
OFF OFF OFF ON
(4)
FAULT
OFF OFF OFF OFF
(5)
(5)
OFF
T < T
OFF ON OFF ON
MIN
≅ 80 ºC (TEMP_ALARM).
AL
≅ 90 ºC (TEMP_FAULT).
FAULT
≅ -9 ºC (TEMP_FAULT).
MIN
Description
LEDs
UDC _ 1
UDC _ 2
+12 V
Temp
ON
OK
OK
Alarm
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
ON
OFF
ON
OFF
OFF
OFF
(2)
(3)
ON
OFF
OFF
OFF
(2)
(3)
ON
ON
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
Figure 2.5 on page
2-7.
Figure 2.5 on page
2-7.
Possible Causes
Temp
Fault
OFF
+ 24 Vdc applied to the control
circuit (CIR11) and the main power
supply (R, S and T) is missing. Ready
for power energization.
OFF
Power supply connected, pre-charge
in progress.
OFF REGULAR OPERATION.
OFF
Phase fault or undervoltage at the
input power
(2) (3)
.
Open fuse.
Open circuit breaker.
OFF
Defective UR11.
OFF
Heatsink temperature higher
than 80 °C (176 °F) (alarm
temperature).
ON
Heatsink overtemperature,
higher than 90 °C (194 °F) (fault
temperature).
OFF
Control (CIR11) without +24 Vdc
power supply.
ON
Heatsink undertemperature, smaller
than -9 °C (16 °F).
Defective or opened NTC.
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