User guide

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.