Yaskawa AC Drive-Option BRAKING UNIT-CDBR Spec.D - Manual (Page 59)

YASKAWA ELECTRIC TOBP C720600 01C 1000-Series Option CDBR-†D, LKEB-† Installation Manual 59
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).
No CDBR braking unit is connected
and the transistor for DC bus
discharge in the drive is shorted.
Replace the drive.
The transistor for DC bus discharge
in the CDBR braking unit is shorted
as indicated by contacts EA-EB-EC.
Replace the CDBR braking unit.
CDBR braking unit switch S3 for the
power supply voltage is set to the
wrong position.
Set the 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 and 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 supply voltage
increases momentarily. Investigate the cause of high input
voltage.
Fault output contacts MA-MB-MC
changes states. Overvoltage (ov) may
occur on drive:
- CDBR heatsink over temperature
- 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. Use the correct combination of
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.
The fault contact on the CDBR
braking unit closed momentarily
when input power was applied.
No braking resistor (LKEB braking
resistor unit) is installed. Install a braking resistor (LKEB
braking resistor unit).
TOBP_C720600_01C_3_0_E.fm 59 ページ ２０１３年１０月７日 月曜日 午後２時２０分