Baldor 15H SERIES 15H Installation & Operating Manual page 79

Section 1
General Information
INDICATION
Command Select Incorrect operating mode
programmed.
Need expansion board.
Bus Overvoltage Excessive dynamic braking power.
Trip or
HW Overvoltage
DECEL Rate set too low a value
Overhauling Motor load
Dynamic brake mis-wired.
Input voltage too high.
Bus Undervoltage Input voltage too low.
External Trip Motor ventilation insufficient.
Motor draws excessive current.
Volts/Hertz ratio is wrong.
No thermostat connected.
Poor thermostat connections.
External trip parameter incorrect.
Hardware Protect Fault duration too short to be
identified.
Heatsink Temp Motor Overloaded.
Ambient temperature too high.
Built-in fans are ineffective or
inoperative.
5-6 Troubleshooting
Table 5-3 Troubleshooting
POSSIBLE CAUSE CORRECTIVE ACTION
Change Operating Mode in the Level 1 Input block to one that does not
require the expansion board.
Install the correct expansion board for selected operating mode.
Check dynamic brake watt and resistance parameter values.
Increase the DECEL time.
Add external dynamic braking assemblies: RGA resistor kit or
RBA transistor assembly.
Lengthen DECEL time.
Add external dynamic braking resistors or module.
Correct problem with motor load.
Add external dynamic braking resistors or module.
Check dynamic brake hardware wiring.
Verify proper AC line voltage.
Use step down transformer if needed.
Use line reactor to minimize spikes.
Verify proper AC line voltage.
Use step up transformer if needed.
Check power line disturbances (sags caused by start up of
other equipment).
Monitor power line fluctuations with date and time imprint
to isolate power problem.
Disconnect dynamic brake hardware and repeat operation.
Clean motor air intake and exhaust.
Check external blower for operation.
Verify motor's internal fan is coupled securely.
Check motor for overloading.
Verify proper sizing of control and motor.
Adjust the Volts/Hz parameter value.
Adjust the Base Frequency.
Adjust the Max Output Voltage.
Connect thermostat.
Verify connection of all external trip circuits used with thermostat.
Disable thermostat input at control.
Check thermostat connections.
Verify connection of external trip circuit at J4-16.
Set external trip parameter to "OFF" if no connection made
at J4-16.
Reset control.
Check for proper grounding of power wiring and shielding of signal wiring.
Replace control board.
Correct motor loading.
Verify proper sizing of control and motor.
Relocate control to cooler operating area.
Add cooling fans or air conditioner to control cabinet.
Verify fan operation.
Remove debris from fan and heatsink surfaces.
Replace fan or check fan wiring.
MN715