Product Overview 1-9
1560D-UM051D-EN-P – February 2005
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 64).
Line Faults
The MV Dialog Plus™ controller continually monitors line conditions for
abnormal factors. Pre-start protection includes:
• Power Loss (with phase indication)
• Line Fault (with phase indication)
– Power loss
– Missing load connection
– Shorted SCR
Starting and Stopping protection includes:
• Line Fault (no phase indication)
– Power loss
– Missing load connection
– Shorted SCR
Additional programmable parameters are provided for the following
protective features:
• Undervoltage
X can be adjusted from 0 to 99% of the programmed line
voltage and has a programmable delay time of 0 to 99 seconds.
Note: For medium voltage applications, undervoltage protection
should be set from 80 to 99%.
• Overvoltage
X can be adjusted from 0 to 199% of the programmed
line voltage and has a programmable delay time of 0 to 99 seconds.
Note: For medium voltage applications, overvoltage protection should
be set from 100 to 115%.
• Phase reversal
Y protection can be toggled either ON or OFF.
• Voltage unbalance X protection can be programmed for trip levels of 0
to 25% with a programmable delay time of 0 to 99 seconds.
X Undervoltage, overvoltage, and voltage unbalance protection are disabled during braking operation.
Y Phase reversal protection is functional only at pre-start.
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