Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019 23
Product Overview Chapter 1
Pump Stop
Just as starting a centrifugal pump at full voltage causes fluid hammer and check
valve slam, stopping a centrifugal pump that is running at full speed can also
produce the same results. The SMC- 50 module's Pump Stop mode generates a
motor stop curve, which follows the stop characteristics of a centrifugal pump.
This results in the gradual decrease in motor speed.
Figure 12 - Pump Stop Timing Diagram
ATTENTION: Pump stopping is not intended to be used as an emergency stop.
See 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.
IMPORTANT The Braking Control options (Smart Motor Braking and Slow Speed with
Braking) are not offered for standard use in MV applications. Please consult the
factory for further assistance.
IMPORTANT Energy Saver Run operation and Motor Winding heater operation are not
offered for use in MV applications. Consult the factory for further assistance.
100%
Time (seconds)
Run
Motor Speed
Pump Start
Ramp Time
Pump Stop
Stop Time
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