Rockwell Automation 1560E SMC Flex Smart Motor Controller - Manual (Page 27)

Product Overview 1-17
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.
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 page 9-1 for
instructions).
Metering Power monitoring parameters include:
• Three-phase current
• Three-phase voltage
• Power in MW
• Power usage in MWh
• Power factor
• Motor thermal capacity usage
• Elapsed time
• Motor speed (100%, with use of optional tachometer input)
Notes:
1. Voltage measurement is not available during the braking operation of
the SMB Smart Motor Braking, Accu-Stop, and Slow Speed with
Braking control options.
2. The elapsed time and MWh values are automatically saved to memory
every 12 hours.
3. Motor thermal capacity usage is determined by the built-in electronic
thermal overload. An overload fault occurs when this value reaches
100%.