Rockwell Automation 7763 Medium Voltage OneGear SMC Flex Motor Controller (10-15 kV) - Manual (Page 40)

40 Rockwell Automation Publication 7760-UM001D-EN-P - October 2014
Chapter 1 Product Overview
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 22 - Pump Control Option
Braking Control Options
The Braking Control options (Smart Motor Braking, Accu-Stop and Slow Speed
with Braking) require attention to specific application considerations, and
therefore are not offered for standard use in MV applications. Please consult
factory for further assistance.
Hardware Description The following sections contain descriptions of system components and system
operation. Each section will be described to give the user an understanding of the
MV SMC Flex to facilitate operation and maintenance of the system. Refer to
Figure 23 and Figure 24 , Typical MV SMC Flex Power System.
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.
Pump Start Run Pump Stop
100%
Motor
Speed
Pump Start Run Pump Stop
Time (seconds)