System 12 Scr Drive - MCE iControl User Manual

Troubleshooting

System 12 SCR Drive

This section provides a quick reference to the indicators, test points and jumper settings found
on the SCR-LGA Drive Logic board and explains how to replace various components in the Sys-
tem 12 SCR Drive, including:
• Replacing Fuses
• Replacing Contactors
• Replacing SCRs and Diodes
• Replacing PC Boards
SCR-LGA - SCR Drive Logic Board Quick Reference
This quick reference provides descriptions of the following:
• Indicators on the SCR-LGD and SCR-LGA boards
• SCR-LGA Test Points
• SCR-LGA Jumper Settings
Refer to the SCR-LGA Board Layout
Table 6.29 Indicators on the SCR-LGD and SCR-LGA Boards
Indicator
Up Direction
Down Direction
Drive Ready
Drive ON
Current Limit
Low Line - WYE
Secondary
Low Line - Delta Sec-
ondary
WYE P.R.
Delta P.R.
0
30 P.R.
Contactor or High Cur-
rent Fuse Failure
PLL No Lock
6-118 Manual # 42-02-7223
to locate the jumpers and test points.
Up direction is selected.
Down direction is selected.
There are no faults and the drive is ready to run.
The drive is enabled and is producing torque output.
The drive has reached either the current or voltage limit set by the drive header and
software parameters Armature current limit or Armature voltage limit (Configuration
> Safety tab).
The voltage at the Wye connection of the drive isolation transformer secondary is
below 30% of the rated value.
The voltage at the Delta connection of the drive isolation transformer secondary is
below 30% of the rated value.
The phase relationship of the Wye connection (Y1, Y2, Y3) is incorrect.
The phase relationship of the Delta connection (X1, X2, X3) is incorrect.
The phase relationship between the Wye and Delta connections is incorrect.
The main contactor is not picked, or one or more of the high current fuses is open
when the drive is enabled.
(SCR-LGA board) The PLL circuit has a problem of synchronization with the Delta
connection from the AC line. This indicator will also turn on while the controller is
powering up and when the SCR-LGA board is being reset.
Description