Rockwell Automation 1560E SMC Flex Smart Motor Controller - Manual (Page 30)

1-20 Product Overview
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Control Options (cont.) 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.
Motor
Speed
100%
Time (seconds)
Pump Start Run Pump Stop
Motor
Speed
100%
Time (seconds)
Pump Start Run Pump Stop
Figure 1.17 – Pump Control Option