Troubleshooting
6-76 Manual # 42-02-7223 C1
SCR Low Line Fault, SCR LOW LINE FAULT
Description: Indicates that AC line voltage to the System 12 Drive has dropped below 95% of the SCR-LGA
header value. DC controls only.
Car Reaction: Car will not move.
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 Test Fault
Description: The test to determine the line voltage to the System 12 drive has failed to determine the line
voltage (see SCR Low Line Caution Activated). DC controls only.
Car Reaction: None. Previous line voltage test values are used.
Troubleshooting: Possible internal hardware error on iBox trying to update System 12 drive’s MDAC.
SCR Phase Lock Loop Fault, SCR PHASE LCK LP FLT
Description: This fault indicates that the phase lock loop circuit PLL LED is ON in the SCR-LGA and that the
System 12 SCR Drive was unable to lock onto the incoming line frequency. The PLL LED is normally on for a
few seconds during power up. DC controls only.
Car Reaction: Car will not move.
Tro ubleshooting:
1. Contact MCE technical support.
SCR Phase Lock Loop Warning
Description: Phase lock loop circuit PLL LED is ON in SCR-LGA and that System 12 SCR Drive was unable to
lock onto incoming line frequency. PLL LED is normally on for a few seconds during power up. Detected while
the car is not moving. DC controls only.
Car Reaction: Car will not move.
Tro ubleshooting:
1. Verify PLL indicator is active on SCR-LGA board.
2. Verify iBox is not resetting SCR drive. If so, PLL indicator will be active for a short interval. For a recur-
ring drive fault, iBox should reset SCR drive every 15 seconds. If so, there is probably an underlying fault
the iBox is trying to clear.
3. Contact MCE technical support.
SCR Power Supply Fault, SCR POWER SUPPLY FLT
Description: Indicates that power supplied to the System 12 SCR Drive is insufficient. DC controls only.
Car Reaction: Car will not run.
Tro ubleshooting:
1. Check all supply voltages on SCR-PS board (See “System 12 SCR Drive” on page 6-126.).
2. Check F2D fuse. Verify voltages in drive within 1%. Please refer to “Calibrating Actual Car Speed (Sys-
tem 12 SCR Drive)” on page 2-38.
3. If voltages are correct, check drive cable from the iBox to the drive. Check the SCR-LGA board (See
“System 12 SCR Drive” on page 6-126.).
Secondary Fire Switch On, SEC FIRE SWITCH ON
Description: The Secondary Fire Recall Switch is in the ON position.
Car Reaction: Car will recall to Main fire recall floor, position doors as indicated on Car Operation > Fire Ser-
vice > Fire Code > Fire Recall tab, and await activation of in-car firefighter switch.
Troubleshooting: If in error, check the Secondary Fire Recall switch input.
Security On
Description: Indicates that system security is On.
Table 6.3 iControl Messages
iControl Messages
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