Rockwell Automation MV SMC Flex Motor Controller (for Series K or later) User Manual
Page 39
Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013
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Product Overview
Chapter 1
Bulletin 1560E • DPI Control – With Controlled Stop
The control scheme shown in
allows the MV SMC Flex to be
controlled using DPI (Drive Programming Interface). (Refer to
for Logic Command Word bits assignment for DPI control). This
special usage of DPI includes provisions for a “Local” mode of control as well.
With the Local-Off-Remote selector switch in the “Remote” position, terminal
18 of the SMC Flex module is energized, allowing start and stop maneuvers to be
executed via DPI. When a “Start” is executed, the “Aux #4” contact closes, which
serves as an interlock with the main contactor (or breaker) in the existing starter.
As with the other control schemes, the SMC Flex module closes “Aux #1”,
energizing “B-IV”, as the motor approaches rated speed. When a “Stop” is
executed, the unit opens “Aux #1”. The bypass contactor opens and the unit
initiates a controlled stop sequence, followed by opening of “Aux #4”, which
opens the main contactor (or breaker) in the existing starter.
When using the optional HIM, pressing the “Jog” button will initiate the
optional stop maneuver, and pressing the “O” button will initiate a coast stop.
An uncontrolled, or coast stop, can be achieved via DPI or by opening the
connection on terminal 18 (i.e. by energizing “Coast Stop” relay in the existing
starter).
To run in “Local” mode, the “CR” contact is used to initiate a start and stop
sequence (similar to
). Closure of the “Start” relay from the existing
starter, allows the unit to initiate motor soft starting. Likewise, opening of “Start”
relay from the existing starter will initiate a controlled stop. An uncontrolled, or
coast stop, is achieved by opening the connection on terminal 17 (i.e. by
energizing “Coast Stop” relay in the existing starter). This contact should remain
open to ensure all hold-in contacts clear, to prevent a re-start.
It is more important in this configuration to integrate the control circuit of the
1560E with the existing controller, for better control of the Stop option. The
“start signal” for this scheme cannot be a slave of the main contactor, since it must
remain closed to accomplish the option stop maneuver. The SMC Flex module
can be used to control the main contactor such that it will close when a start is
initiated, and remain closed until it has sensed the motor has stopped following
an option stop maneuver.