Rockwell Automation MV SMC Flex Motor Controller (for Series K or later) - Manual (Page 36)

26 Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013
Chapter 1 Product Overview
If the motor has started, the unit is in the bypass mode, and a trip occurs within
the SMC Flex module or from an external protection relay; “Aux #4” will open
the line contactor immediately, and “Aux #1” will remain closed for 10 seconds to
protect the power electronics from any voltage transients due to opening the
motor circuits. A trip due to an overload or fault condition will result in a “coast”
stop.
Bulletin 1562E • DPI Control – Controlled Start only
The control scheme shown in Figure 22 allows the MV SMC Flex to be
controlled using DPI (Drive Programming Interface). ( Table 16 on page 109 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 a start command to be
executed via DPI. When a “Start” is executed, the “Aux #4” contact closes,
energizing both “M-IV” and “MCX”. The line contactor closes and the unit
initiates a start sequence.
When the motor approaches rated speed, the SMC Flex module closes “Aux #1”,
energizing “B-IV”, which closes the bypass contactor.
To run in “Local” mode, the “CR” contact is used to initiate a start sequence
(similar to
Figure 20 ).
A stop command can be generated via DPI or by opening “CR”, depending on the
control mode.
Bulletin 1562E • DPI Control – With Controlled Stop
The control scheme shown in Figure 23 allows the MV SMC Flex to be
controlled using DPI (Drive Programming Interface). ( Table 16 on page 109 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,
energizing both “M-IV” and “MCX”. The line contactor closes and the unit
initiates a start sequence.
When the motor approaches rated speed, the SMC Flex module closes “Aux #1”,
energizing “B-IV”, which closes the bypass contactor. 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 line
contactor.