MCi iControl User Manual page 345

Table 6.3 iControl Messages
SCR Contactor Fuse Fault, SCR CNTACTR FUSE FLT
Description: Indicates that either the semiconductor fuse has blown or one or more of the 6 contacts within
the two contactors has failed. DC controls only.
Car Reaction: Emergency Stop.
Troubleshooting:
1. Check secondary wires of drive isolation transformer.
2. Check primary voltage on each of the primary terminals of the drive isolation transformer.
3. Check for harsh motor control, vibration, or humming.
4. Check for motor mechanical defect such as interpole (partially shorted).
5. Set an oscilloscope to 2msec/div, 500mv/div, AC coupling. Verify that the 12 drive pulses have equal
amplitudes and periods.
6. Check M1 and M2 contacts.
7. Check semiconductor fuses. (See Section 8.)
SCR Drive Ready Fault, SCR DRIVE READY FAULT
Description: Ready signal from the System 12 SCR Drive is inactive. This signal is inactive when the System
12 Drive detects a fault or is being reset (about 5 seconds). DC controls only.
Car Reaction: The elevator is prevented from moving while this signal is inactive.
Troubleshooting: Check the Event Calendar, Hoistway display or iBox display for active SCR drive faults and
follow the recommended troubleshooting for those faults.
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.
Troubleshooting:
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-LG9A)
board (see Section 8).
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.
Troubleshooting:
1. Run the car on inspection while monitoring armature current versus command current. Verify both val-
ues 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.
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.
iControl Messages
iControl Messages
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