Line faults, Excessive starts/hour, Overtemperature – Rockwell Automation 7763 Medium Voltage OneGear SMC Flex Motor Controller (10-15 kV) User Manual
Page 35: Line faults excessive starts/hour overtemperature
Rockwell Automation Publication 7760-UM001D-EN-P - October 2014
35
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 u can be toggled either ON or OFF.
Note:
Phase reversal protection is functional only at pre-start.
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.
Note:
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.
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 fibre-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.
This trip may also indicate a problem with the gate driver board, fiber optic cable
or interface board.
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 (see
for
instructions).