ABB DCS550 - Page 208

208
Signal and parameter list
3ADW000379R0501 DCS550 Manual e e
Signal / Parameter name
min.
max.
def.
unit
22.07 VarSlopeRate (variable slope rate)
Variable slope is used to control the
slope of the speed ramp during a speed reference change. It is active
only
with VarSlopeRate (22.07) ≠
0. Variable slope rate and the drive’s internal ramp are connected in series.
Thus follows that the ramp times
- AccTime1 (22.01) and DecTime1 (22.02) - have to be faster than the
complete variable slope rate time.
VarSlopeRate (22.07) defines the speed ramp time t (ms) for the speed
reference change
A (rpm):
t
(ms) = cycle time of the overriding control (e.g. speed reference generation)
A
(rpm) = speed reference change during cycle time t
Note:
In case the overriding control system’s cycle time
t (ms) of the speed reference and VarSlopeRate (22.07)
are
equal, the shape of
SpeedRef3 (2.02) is a strait line.
Int. Scaling: 1 == 1 ms Type: I Volatile: N
0
30000
0
ms
22.08 BalRampRef (balance ramp reference)
The output of the speed ramp can be forced to the value defined by
BalRampRef (22.08). The function is
released by setting
AuxCtrlWord (7.02) bit 3 = 1.
Internally limited from:
rpmtorpm
20000
32767
*)29.2(
20000
32767
*)29.2(−
Int. Scaling: (2.29) Type: SI Volatile: N
-10000
10000
0
rpm
22.09 AccTime2 (acceleration time 2)
The time within the drive will accelerate from zero speed to
SpeedScaleAct (2.29). AccTime2 (22.09) can be
released w
ith Ramp2Sel (22.11).
Int. Scaling: 100 == 1 s Type: I Volatile: N
0
300
20
s
22.10 DecTime2 (deceleration time 2)
The time within the drive will decelerate from
SpeedScaleAct (2.29) to zero speed. DecTime2 (22.10) can be
released with
Ramp2Sel (22.11).
Int. Scaling: 100 == 1 s Type: I Volatile: N
0
300
20
s