Rockwell Automation MV SMC Flex Motor Controller (for Series K or later) - Manual (Page 30)

20 Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013
Chapter 1 Product Overview
Pump Application Considerations
1. Consult factory if start time settings over 30 seconds are required. The
base rating of the MV SMC Flex is two starts (or one start/stop
combination) per hour, thirty seconds maximum for each operation. A
stopping operation counts as a start for purposes of thermal capacity
calculations.
2. The Pump Control option functions only for centrifugal pumps. It is not
suited for positive displacement, piston, or other types of pumps.
3. The Pump Stop option functions only for a centrifugal pump running at
greater than approximately 2/3 of the motor rated horsepower.
4. Pump applications with input and/or output valves that are closed during
starting and/or stopping may not benefit from the Pump Control option.
Consult the factory for applications with valves.
5. For starting or stopping times longer than 15 seconds, power fuse selection
should be reviewed to ensure no element damage occurs. The fuse
minimum melting time-current characteristic curve should be consulted to
ensure that, at 1.1 times the full voltage locked rotor current of the motor,
the actual starting or stopping time does not exceed 75% of the fuse
melting time.
6. Motor overload and/or upstream breaker settings may have to be adjusted
to allow the starting or stopping current to flow for extended periods.
Figure 17 - Pump Control Option
ATTENTION: Pump stopping is not intended to be used as an emergency stop.
Refer to the applicable standard for emergency stop requirements.
ATTENTION: Pump stopping may cause motor heating depending on the
mechanical dynamics of the pumping system. Therefore, select the lowest
stopping time setting that will satisfactorily stop the pump.
100%
Motor
Speed
Run Pump Stop Pump Start
Time (seconds)