Faults and Possible Causes
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
BASE ID FLT
Invalid power base ED number.
Press RESET key. If fault remains call factory.
CURRENT SENS FLT
Open circuit between control board and
check connections from control board to current
current sensor.
sensors.
Defective current sensor.
Replace current sensor.
DC BUS HIGH
Excessive dynamic braking power.
Check DYNAMIC BRAKING parameters for
correct wattage and resistance values.
Lengthen deceleration time.
Increase or add external dynamic braking
resistors RGA kit or dynamic braking resistor/
transistor RBA assembly.
Dynamic brake wiring problem.
Check dynamic brake hardware wiring.
Input voltage too high.
Verify proper incoming line voltage.
Use transformer to step down voltage.
Use line reactor to minimize voltage spikes.
DC BUS LOW FAULT
Insufficient input voltage.
Disconnect DB hardware and re-try.
Verify proper incoming line voltage.
Use transformer to step up voltage.
Check power line disturbances due to starting
other equipment.
Monitor power line for correlation of time/date
and power fluctuations.
FEEDBACK LOSS
Resolver power supply loss.
Check 4 VAC supply at terminal strip
Excessive noise on resolver lines.
Check resolver connections. Separate resolver
leads from power wiring. Cross power leads at
90°.
EXTERNAL TRIP
EXTERNAL TRIP Parameter set to “ON”
Verify connection of external trip circuits to
and no connection made at J1-16.
control terminal strip.
Set EXTERNAL TRIP parameter to “OFF” if
circuit not used.
Motor ventilation insufficient.
Check external motor blower for proper operation.
No thermostat connected.
Connect thermostat.
Disable EXTERNAL TRIP parameter to “OFF”
if thermostat not used.
Poor thermostat connections.
Check thermostat connections.
Motor drawing excessive current.
Check motor for overloading.
Verify sizing of motor and control for application.
Continued on next page...
4-8
DIAGNOSTIC INFO AND TROUBLESHOOTING
MN723H-10/95 11/28/95 1:13 AM Page 92 (Black plate)
Summary of Contents for 23H Series
Page 11: ...1 8 GENERAL INFORMATION MN723H 10 95 11 28 95 1 07 AM Page 12 Black plate...
Page 83: ...3 30 KEYPAD PROGRAMMING AND OPERATION MN723H 10 95 11 28 95 1 13 AM Page 84 Black plate...
Page 99: ...4 16 DIAGNOSTIC INFO AND TROUBLESHOOTING MN723H 10 95 11 28 95 1 14 AM Page 100 Black plate...
Page 125: ...5 26 APPENDIX G MN723H 10 95 11 28 95 1 21 AM Page 126 Black plate...
Page 126: ...MN723H 10 95 11 28 95 1 21 AM Page 127 Black plate...
