60 YASKAWA ELECTRIC TOBP C720600 01E YASKAWA AC Drive Option CDBR-D, LKEB- Installation Manual
8 Troubleshooting
8 Troubleshooting
Problems Cause Possible Solution
The thermal relay (or the thermal
protector) on the LKEB braking
resistor unit trips while stopped or
operating at steady speed (no
deceleration).
There is not a CDBR braking unit
connected and the DC bus braking
transistor short circuited.
Replace the drive.
The DC bus braking transistor in the
CDBR braking unit is short circuited
as indicated by contacts EA-EB-EC.
Replace the CDBR braking unit.
CDBR braking unit DIP switch S3
for the power supply voltage is set to
the wrong position.
Set DIP switch S3 to the correct
position.
The drive faults on overvoltage.
The braking resistor unit is too small.
Re-evaluate the braking conditions
required for the application.
Incorrect wiring or CDBR switch
positions.
Inspect the wiring, switch settings,
and correct any mistakes.
The CDBR braking unit is damaged. Replace the CDBR braking unit.
The thermal relay (or the thermal
protector) on the braking resistor unit
trips occasionally.
The braking resistor unit is too small.
Re-evaluate the braking conditions
required for the application.
The CDBR braking unit is damaged. Replace the CDBR braking unit.
Incorrect CDBR switch position. Correct the switch settings.
Incoming main power supply voltage
increases momentarily.
Investigate the cause of high input
voltage.
Fault output contacts MA-MB-MC
change states. Overvoltage (ov) may
occur on drive:
- CDBR heatsink overheat
- CDBR transistor overcurrent
The application is experiencing
excessive starting and stopping, or
the load inertia is too large for the
CDBR unit.
Re-evaluate the braking
requirements.
The CDBR braking unit and LKEB
braking resistor unit are not
appropriately matched.
Correctly match the CDBR braking
unit and LKEB braking resistor unit.
Resistor is wired incorrectly. Check for proper resistance.
Ambient temperature exceeded
50°C (122°F). CDBR heatsink is too
hot.
Reduce the ambient temperature.
The CDBR braking unit is damaged. Replace the CDBR braking unit.
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