Rockwell Automation SP600 AC Drive User Manual Version 1.0 - Manual (Page 171)

Parameter Descriptions 12-41
1 = Ramp: When Stop Mode A (155) is set to Ramp, the drive
ramps the frequency to zero based on the deceleration time
programmed into Decel Time 1 (142) or Decel Time 2 (143). The
“normal” mode of machine operation can use Decel Time 1. If a
faster deceleration than normal mode is required, Decel Time 2 can
be activated with a faster rate selected. When Ramp is selected, the
drive acknowledges the Stop command by decreasing or “ramping”
the output voltage and frequency to zero in a programmed period
(Decel Time), maintaining control of the motor until the drive output
reaches zero. The output transistors are then shut off.
The load/motor should follow the decel ramp. Other factors such as
bus regulation and current limit can alter the decel time and modify
the ramp function.
Ramp mode can also include a “timed” hold brake. Once the drive
has reached zero output hertz on a Ramp-to-Stop, and parameters
DC Brake Time (159) and DC Brake Level (158) are not zero, the
drive applies DC to the motor producing current at the DC Brake
Level for the DC Brake Time. The drive output voltage will be zero
when the hold time is finished.
Figure 12.19 – Coast to Stop (Stop Mode A = 0)
Figure 12.20 – Ramp Stop (Stop Mode A = 1)