CDBR-B Installation Instructions - March 2013
13
Troubleshooting
To troubleshoot the dynamic braking circuit (braking unit and braking resistor unit), refer to the chart
below:
Braking Module Test Procedure
1. Remove the cover and check IPCB for physical damage.
2. Using a Digital Multimeter, set the Diode Check function, perform static checks on the main
transistor module, 1TRM.
For CDBR-2045B, 2110B, 4090B, 4220B, 5037B, 5110B, and 5300, check the following:
• Place the positive lead on terminal (-) and the negative lead on terminal (-O). This will check
the collector to emitter junction for a short circuit. A reading of between 0.200V and 0.250V
indicates a good reading.
• Place the positive lead on terminal (-O) and the negative lead on terminal (+O). This will
check the diode connected to the collector for a short circuit. A reading of between 0.200V
and 0.375V indicates a good reading.
For CDBR-2022B and 4045B, check the following:
• Place the positive lead on terminal (-) and the negative on terminal (-O). This will check the
collector to emitter junction for a short circuit. A reading of “OL” indicates a good reading.
• Place the positive lead on terminal (-O) and the negative lead on terminal (+O). This will
check the diode connected to the collector for a short circuit. A reading of approximately
0.5V indicates a good reading.
Fault Status Possible Cause Corrective Action
Drive trips at overvoltage (OV)
• Insufficient braking unit capacity
• Insufficient resistor capacity
• Improper wiring
• Deceleration time too short
• Braking unit fault
• Verify CDBR-B capacity
• Verify resistor capacity
• Verify wiring is correct
• Lengthen deceleration time
• Replace the braking unit
Braking Unit Thermal Overload
trips when not decelerating
• Improper braking unit power
supply voltage selection setting
• Incoming (line) voltage too high
• Discharge transistor shorted
• Verify jumper setting
• Correct line voltage
• Replace the braking unit
Braking Unit trips by heatsink
overheat
• Excessive load inertia
• Improper combination of braking
unit and resistor
• Ambient Temperature >104°F
(40°C)
• Reduce load
• Verify proper braking unit/resistor
• Install air conditioner
WARNING
Do NOT touch any circuit components while AC main power is on or immediately after main AC
power is disconnected from the unit. You must wait until the red “CHARGE” lamp is
extinguished. It may take as long as 10 minutes for the charge on the main DC bus capacitors to
drop to a safe level. Failure to adhere to this warning could result in serious injury.
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