Rockwell Automation 1560E SMC Flex Smart Motor Controller - Manual (Page 26)

1-16 Product Overview
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Open Gate
An open-gate fault indicates that improper SCR firing, typically caused by
an open SCR gate or driver system, has been detected on one of the power
poles. Before the controller shuts down, it will attempt to start the motor a
total of three times (or as programmed in Parameter 82).
An open gate is detected when the module sends a gate signal to the SCRs
but does not detect that they turned on. SCR turn-on is detected when the
voltage across the leg (L-T) collapses.
Line Faults
The MV SMC-Flex™ controller continually monitors line conditions for
abnormal factors. Pre-start protection includes:
• Line Fault (with phase indication)
– Line voltage loss
– Missing load connection
– Shorted SCR
Running protection includes:
• Line Fault (no phase indication)
– Line voltage loss
– Missing load connection
Phase reversal protection : can be toggled either ON or OFF.
: Phase reversal protection is functional only at pre-start.
Protection and Diagnostics
(cont.)