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6-70 Manual # 42-02-2223
Troubleshooting
SCR Dynamic Brake Fault, SCR DYN BRAKE FAULT
Description: Indicates either more than 18-volts across dynamic braking resistor or dynamic brake input
from SCR drive is active. DC controls only.
Car Reaction: Emergency Stop.
Troubleshooting:
1. If fault occurs with no other SCR Drive faults in Event Log, likely that a different failure such as AC Phase
Failure occurred but occurred too quickly to be captured.
2. If other SCR drive faults present, possible defective dynamic brake SCR or SCR-LG9A) board.
SCR Excessive Armature Current, SCR EXS ARM CURRENT
Description: Armature feedback current exceeded 200% of rated armature current within 250 milliseconds
after run enabled. Triggers Drive Forced fault if encountered 4 times within 7 run attempts. DC controls only.
Car Reaction: Car will not run.
Troubleshooting:
1. Run car on inspection while monitoring armature current versus command current. Verify both are
approximately equal.
2. Check interpole feedback, filter capacitors (SCR page of job prints), any component in loop feedback
from SCR drive out to motor and back to drive.
3. Verify drive header current and voltage.
4. Check serial cable between iBox and drive.
5. Check SCR-LGA board (section 8).
SCR Excessive Current Command, Drive Disabled, SCR EXS CURRENT CMD DD
Description: Current command output greater than 200mV before run enable. DC controls only.
Car Reaction: Car will not run.
Troubleshooting:
1. Verify standard control gains (proportional, integral) on drive screens.
SCR Excessive Current Command, Drive Enabled, SCR EXS CURRENT CMD DE
Description: Current command output greater than 7VDC within 300mS after enabling run enable relay,
drive enabled. DC controls only.
Car Reaction: Car will not run.
Troubleshooting:
1. Check serial cable between iBox and drive.
2. Check SCR-LGA board (section 8).
SCR High Temp Fault, SCR HIGH TEMP FAULT
Description: Indicates ambient temperature in System 12 drive exceeded 170 degrees F or bad or failing
SCR. iControl attempts to bring car to nearest floor before shutdown. Clears if temp drops below threshold.
Car Reaction: Stop at nearest floor. Car out of service until fault cleared.
Troubleshooting:
1. Check for excessive ambient temperature.
2. Check for insufficient air flow, especially if fault occurs when car running and clears when car is stopped.
Verify fan is operating properly. Check fan fuse.
3. Check for bad or failing SCR.
4. Check for defective fault-generating thermostat. There are two heat sensors, one on each heat sink.
Check integrity of heat sensor normally closed contacts.
5. Check drive rated armature current to determine if it is operating close to limit threshold. Please refer to
“Current Limit Adjustments” in Section 2.
Table 6.3 iControl Messages
iControl Messages
Summary of Contents for Nidec iControl
Page 1: ...MOTION CONTROL ENGINEERING User Guide iControl with AC Drive...
Page 15: ......
Page 23: ...1 8 Manual 42 02 2223 iControl Overview...
Page 75: ...2 52 Manual 42 02 2223 Construction Mode...
Page 89: ...3 14 Manual 42 02 2223 Inspection Mode...