Rockwell-automation 1560E SMC Flex Smart Motor Controller Manual de usuario descargar pdf (Pagina 27)

Product Overview 1-17

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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%.

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Rockwell-automation 1560E SMC Flex Smart Motor Controller Manual de usuario Pagina 27