User guide

Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013 15
Product Overview Chapter 1
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
(8)
can be toggled either ON or OFF.
Excessive Starts/Hour
The MV SMC Flex module allows the user to program the desired number of
starts per hour (up to 99). This helps eliminate motor stress caused by repeated
starting over a short time period.
Overtemperature
The power module temperature is monitored during starting and stopping
maneuvers by thermistors. The thermistor is connected to the gate driver board
where it is processed, and the status is transmitted by fiber-optic cable through
the interface board to the control module. When an overtemperature condition
exists (>85°C), the control module trips and indicates a “PTC Power Pole” fault.
An overtemperature condition could indicate high ambient temperature,
overloading or excessive cycling. After the power module temperature is reduced
to allowable levels, the fault can be cleared (Refer toTroubleshooting
on
page 113 for instructions).
(8) Phase reversal protection is functional only at pre-start.
TIP
The base rating of the MV SMC Flex is two starts (thirty seconds each max.) per
hour. Applications requiring more frequent starts, or longer duration starts,
should be reviewed with the factory to avoid equipment damage.