Rockwell Automation GV3000/SE Operator Interface Module (OIM) User Guide - Manual (Page 52)

5-12 GV3000/SE Operator Interface Module (OIM) User Guide, Version 2.0
The time the motor takes to decrease speed (except during a coast-to-rest stop) is
directly proportional to the value in this parameter. This parameter does not apply to
jog.
Note that motor load inertia and input line conditions can extend the deceleration time
to a value greater than the preset time. With fast deceleration times, regenerative
motor voltage might charge up the DC bus voltage, causing a HIGH DC BUS
VOLTAGE fault. To avoid the fault condition, extend the deceleration time. If a
deceleration time faster than the acceptable range is required, installing an optional
Snubber Resistor Kit or Regenerative Braking Module Kit might prevent the fault.
For V/Hz regulation with dynamic braking (snubber resistor) disabled (INPUT
PWR/SNUB CONFIG, H.017, programmed to 0, 2, or 4) the deceleration time can be
extended to prevent a high DC bus voltage condition.
Note that in V/Hz regulation, the drive can decrease output frequency below
MINIMUM SPEED, but not below 0.5 Hz, to avoid an overcurrent fault.
DECEL TIME (P.002)
Specifies the time it
takes for the motor
speed to decrease to
zero speed from
MAXIMUM SPEED,
P.004 (V/Hz
regulation) or
MOTOR TOP
SPEED, U.017
(vector regulation). Parameter Range: 1.0 to 999.9 SEC (V/Hz)
0.1 to 999.9 SEC (vector)
Default Setting: 20.0 SEC
Parameter Type: TUNABLE
MINIMUM SPEED (P.003)
Limits the reference.
Regardless of the
supplied reference,
the regulator will not
command a speed
less than the value
programmed for this
parameter. Parameter Range: 0.5 to MAXIMUM SPEED (P.004) HERTZ (V/Hz)
0 to MAXIMUM SPEED (P.004) RPM (vector)
Default Setting: 5.0 HERTZ (V/Hz)
150 RPM (vector)
Parameter Type: Tunable
!
ATTENTION: The drive can operate at and maintain zero speed. The
user is responsible for assuring safe conditions for operating personnel
by providing suitable guards, audible or visual alarms, or other devices
to indicate that the drive is operating or can operate at or near zero
speed. Failure to observe this precaution could result in severe bodily
injury or loss of life.