Troubleshooting
6-74 Manual # 42-02-7223 C1
SCR Dynamic Brake Fault, SCR DYN BRAKE FAULT
Description: This fault indicates that there is either more than 18-volts across the dynamic braking resistor
or the dynamic brake input from the SCR drive is active. DC controls only.
Car Reaction: Emergency Stop.
Tro ubleshooting:
1. If this fault occurs with no other SCR Drive faults in the Event Log, it is likely that a different failure such
as an AC Phase Failure has occurred. However, that failure occurred too quickly to be captured.
2. If other SCR drive faults are present, indicates a possible defective dynamic brake SCR or SCR-LGA)
board (See “System 12 SCR Drive” on page 6-126.).
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 a Drive Forced fault if encountered 4 times within 7 run attempts. DC controls
only.
Car Reaction: Car will not run.
Tro ubleshooting:
1. Run the car on inspection while monitoring armature current versus command current. Verify both values
are approximately equal.
2. Check interpole feedback, filter capacitors (SCR page of job prints), any component in the loop feedback
from the SCR drive out to the motor and back to the drive.
3. Verify drive header current and voltage. Please refer to “Calibrating Actual Car Speed (System 12 SCR
Drive)” on page 2-38.
4. Check serial cable between iBox and drive.
5. Check SCR-LGA board (See “System 12 SCR Drive” on page 6-126.).
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.
Tro ubleshooting:
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 the run enable relay,
drive enabled. DC controls only.
Car Reaction: Car will not run.
Tro ubleshooting:
1. Check serial cable between iBox and drive.
2. Check SCR-LGA board (See “System 12 SCR Drive” on page 6-126.).
SCR High Temperature Fault, SCR HIGH TEMP FAULT
Description: Ambient temperature inside System 12 drive exceeded 170 degrees F or bad or failing SCR.
iControl will attempt to bring the car to the nearest floor before shutting down. The fault clears when the
temperature drops below tripping threshold. DC controls only.
Car Reaction: Stop at nearest floor. Car out of service until fault cleared.
Tro ubleshooting:
1. Check for excessive ambient temperature.
2. Insufficient air flow through drive, especially if fault generated when car is running and clears when car is
stopped. Verify that the fan is operating properly. Check the 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 the integrity of the heat sensor’s normally closed contacts.
5. Check the drive rated armature current to determine if it is operating close to the limit threshold. Please
refer to “Current Limit Adjustments (System 12 SCR Drive)” on page 2-39.
Table 6.3 iControl Messages
iControl Messages
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