Troubleshooting and Maintenance
5
UR11 | 5-3
5.3 SOLUTIONS FOR THE MOST FREQUENT PROBLEMS
Table 5.3 -
Solutions for the most frequent problems
Problem
Point to be Verified
Corrective Action
+12 V LED ON does not light,
+12 Vdc power supply does not start.
+24 Vdc supply cable connection inverted, loose
connection or broken wiring.
1. Connect the +24 Vdc cabling with the proper
polarity to the XC1 connector of CIR11 board.
Rectifier does not start.
Power supply connections (R1, S1, T1, R2, S2, T2),
+24 Vdc connections, input fuses, input circuit
breaker, DIP Switch S1 configuration at CIR11
board.
1. P24 Vdc supply to the CIR11 control.
2. Provide proper voltage to R, S and T.
3. Setting S1 DIP Switch at CIR11 board
according to the input power supply.
Phase fault or undervoltage at the input
power
Input power supply, fuses, circuit breaker and
connections.
1. Replace damaged fuses.
2. Check main circuit breaker switching.
3. Provide proper voltage to R, S and T.
High temperature alarm in the heatsink
(temperature higher than 80 °C (176 °F))
UR11 fans, cleaning of the heatsink fins. Phase
current balance of the UR11 input.
Check if the current waveform is typical to a
6/12 pulse rectifier, if all pulses are present at all
the input phases (R1, S1, T1, R1, S2 and T2).
1. Provide proper voltage to the fans.
2. Cleaning of the heatsink fins according to
5.5.1 Cleaning Instructions on page 5-5
3. Replacement of the fans.
4. Replacement of the defective UR11.
Heatsink overtemperature (temperature
higher than 90 ºC).
Heatsink Undertemperature, smaller
than -9 ºC.
Open or defective NTC.
CIR11 board connections (XC3R, XC3S, XC3T)
and NTCs.
1. Tightening of the CIR11 board connections.
2. Replacement of the defective UR11.
5.4 INFORMATION FOR CONTACTING TECHNICAL SUPPORT
NOTE!
For technical support and servicing, it is important to have the following information in hand:
Rectifier model.
Serial number and manufacturing date that are listed in the product nameplate (refer to
2.4 IDENTIFICATION LABEL FOR THE UR11 on page 2-8
Application data and rectifier settings.
5.5 PREVENTIVE MAINTENANCE
DANGER!
Always turn off the mains power supply before touching any electrical component associated to the
rectifier.
High voltage may still be present even after disconnecting the power supply.
To prevent electric shock, wait at least 10 minutes after turning off the input power for the complete
discharge of the power capacitors.
Always connect the equipment frame to the protective ground (PE). Use the adequate connection
terminal in the rectifier.
ATTENTION!
The electronic boards have electrostatic discharge sensitive components. Do not touch the components
or connectors directly. If needed, first touch the grounded metallic frame or wear a ground strap.
Do not perform any withstand voltage test!
If needed, consult WEG.
