Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011 177
Detailed Drive Operation Chapter 1
2. Ramp Stop - when in ramp stop, the drive acknowledges the stop
command by ramping down the motor speed reference using the
programmed parameter 33 [Decel Time 1], maintaining control of the
motor until the drive output reaches zero. The output transistors are then
shut off.
3. Current Limit Stop - when in current limit stop, the drive acknowledges
the stop command by setting the motor speed reference to zero, causing the
drive to bring the motor down to zero speed as fast as the power limits,
torque limits and current limits will allow. When the drive output reaches
zero, the output transistors are shut off.
When different stop types are commanded at the same time, the priority from
highest priority to lowest is coast stop, current limit stop, and then ramp stop.
The remainder of this section describes how to configure the drive for the
different start and stop modes.
Configuring the Start and Stop for 3-Wire Control (Momentary
Start and Stop)
To configure the drive for 3-wire control with a ramp stop:
For parameter 153 [Control Options], set bit 8 “3WireControl” = 1.
To c o n tr o l f r o m d i g it a l i n p u t s :
1. Set one of the parameters 825…830 [Dig Inx Sel] = 4 “Norm Stop - CF” or
= 14 “Normal Stop.” “Norm Stop-CF” indicates that the same digital
input is used as a stop and to clear any faults.
2. Set a second parameter 825…830 [Dig Inx Sel] = 5 “Start.”
To control from a communication network (20-COMM module):
1. Toggle bit 1 “Start” in the logic command word on and then off to perform
a start.
2. Toggle bit 0 “Stop” in the logic command word on and then off to perform
a ramp stop.
To configure the drive for 3-wire control with a coast stop:
For parameter 153 [Control Options], set bit 8 “3WireControl” = 1.
To c o n tr o l f r o m d i g it a l i n p u t s :
1. Set one of the parameters 825…830 [Dig Inx Sel] = 19 “Coast Stop.”
2. Set a second parameter 825…830 [Dig Inx Sel] = 5 “Start.”
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