iControl Messages
Manual # 42-02-7223 C1 6-75
6
iControl DC
SCR Instantaneous Over Current, SCR INST OVER CURRENT
Description: Indicates System 12 SCR Drive detected excessive armature current. DC controls only.
Car Reaction: Emergency Stop.
Tro ubleshooting:
1. Check that the main supply is being shut off during regeneration.
2. Check for a clipped door lock.
3. Check for a motor connection problem.
4. Possible failure of an SCR in the System 12 Drive.
SCR Insufficient Armature Current, SCR INSF ARM CURRENT
Description: Insufficient armature feedback current detected. Generated if requested current is at least 20%
of rated armature current yet detected feedback remains below 10% of rated armature current. Automati-
cally reset if detected four or fewer times in seven consecutive runs. DC controls only.
Car Reaction: Emergency Stop.
Tro ubleshooting:
1. Check Armature Voltage Limit and Armature Current Limit settings on iView/Drive/Safety. Please refer to
“Armature Voltage (System 12 SCR Drive)” on page 4-9.
2. If fault occurs when car is running at speed, adjust Motor Field so that armature voltage is within rated
motor armature voltage.
3. Verify current sensor connection on SCR-LGA board (See “System 12 SCR Drive” on page 6-126.). Check
SCR-LGA board.
4. Check serial cable from drive to iBox.
5. Monitor Up and Down direction inputs on SCR-LGA board (bottom of R14 down, bottom of R22 up). If
there is a momentary drop in direction signal before run is complete, use jumpers to determine if a sec-
tion of safety string failing. WARNING: Car must be on Independent Service before performing this test.
6. If the failure persists from the beginning of the run, make sure the current signal on SCR-LGA board test
point TP3 is not dropping out.
SCR Loop Over Current, SCR LOOP OVER CURRENT
Description: DC loop current has grossly exceeded the reference value. DC controls only.
Car Reaction: Emergency Stop.
Tro ubleshooting:
1. Verify that the brake is completely lifting.
2. Check that the load in the car is not in excess of full load.
SCR Low Line Caution Activated, SCR Low Line Caution, SCR LOW LINE CAUTION
Description: The iBox has determined that the line voltage to the System 12 Drive is between 80% and 95%
of rated armature voltage. The line voltage test occurs every time the elevator stops. The detected percent-
age is based on the Rated Armature Voltage parameter setting on the iView Drive Configuration screen>Gen-
eral tab. DC controls only.
Car Reaction: None. Elevator speed is limited to the detected line voltage percentage.
Tro ubleshooting:
1. Verify that the Rated Armature Voltage parameter value is correct. The RMS value (AC phase measure-
ment on a voltmeter) at TP4 on the System 12 SCR-LGA board reflects the line voltage divided by one
hundred (The RMS values of the line-to-line voltages at the wye and delta connections of the drive or
secondary isolation transformer).
2. Verify the voltage into the primary of the Drive Isolation Transformer is not sagging.
3. Check the drive header rating against the voltage on the isolation transformer secondary. Please refer to
“Current Limit Adjustments (System 12 SCR Drive)” on page 2-39.
SCR Low Line Caution Deactivated
Description: The iBox has determined that the line voltage to the System 12 Drive is above 90% of rated
armature voltage (see SCR Low Line Caution (Activated)). DC controls only.
Table 6.3 iControl Messages
iControl Messages
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