ABB ACS800 Firmware Manual page 181

Index Name/Selection
22.03 DECEL TIME 1
0.00 ... 1800.00 s
22.04 ACCEL TIME 2
0.00 ... 1800.00 s
22.05 DECEL TIME 2
0.00 ... 1800.00 s
22.06 ACC/DEC RAMP
SHPE
0.00 ... 1000.00 s
22.07 EM STOP RAMP
TIME
0.00 ... 2000.00 s
Description
Defines the deceleration time 1, that is the time required for the speed to
change from the maximum (see parameter 20.02) to zero.
- If the speed reference decreases slower than the set deceleration rate, the
motor speed will follow the reference signal.
- If the reference changes faster than the set deceleration rate, the motor
speed will follow the deceleration rate.
- If the deceleration time is set too short, the drive will automatically prolong the
deceleration in order not to exceed drive operating limits. If there is any doubt
about the deceleration time being too short, ensure that the DC overvoltage
control is on (parameter 20.05).
Note: If a short deceleration time is needed for a high inertia application, the
drive should be equipped with an electric braking option, for example, with a
brake chopper and a brake resistor.
Deceleration time
See parameter 22.02.
See parameter 22.02.
See parameter 22.03.
See parameter 22.03.
Selects the shape of the acceleration/deceleration ramp.
0.00 s: Linear ramp. Suitable for steady acceleration or deceleration and for
slow ramps.
0.01 ... 1000.00 s: S-curve ramp. S-curve ramps are ideal for conveyors
carrying fragile loads, or other applications where a smooth transition is
required when changing from one speed to another. The S curve consists of
symmetrical curves at both ends of the ramp and a linear part in between.
A rule of thumb
A suitable relation between the
ramp shape time and the
acceleration ramp time is 1/5.
Defines the time inside which the drive is stopped if
- the drive receives an emergency Stop command or
- the Run Enable signal is switched off and the Run Enable function has value
OFF3 (see parameter 21.07).
The emergency Stop command can be given through a fieldbus or an
Emergency Stop module (optional). Consult the local ABB representative for
more information on the optional module and the related settings of the
Standard Application Program.
Deceleration time
Speed
Linear ramp: Par.
Max
S-curve ramp:
Par. 22.06
Par. 22.02
Actual signals and parameters
FbEq
0 ... 18000
0 ... 18000
0 ... 18000
0 ... 10000
22.06 = 0 s
> 0 s
time
Par. 22.06
0 ... 20000
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