
Chapter 8 - Appendices
584S Frequency Inverter
8 -45
APPENDIX D - PARABOLIC RAMP TIMES
This appendix contains a simple look up table method of calculating the response times for the parabolic ramp for a given
setpoint step size,
d%
, and
S RAMP %
. Note, 100% is assumed to be equal to the
LIMIT FREQUENCY
.
Parabolic Ramp
RAMP OUTPUT
TIME
Tr
d%
Which Formula?
The formula required to calculate the parabolic ramp response time is dependent on the size of the change in setpoint,
d%
.
For a given value of
S RAMP %
, the table below indicates which response time formula is relevant for a given
d%
.
S RAMP %
Formula 1
Formula 2
0
linear Ramp
linear Ramp
10
d% < 2.6%
d% > 2.6%
20
d% < 5.6%
d% > 5.6%
30
d% < 8.8%
d% > 8.8%
40
d% < 12.5%
d% > 12.5%
50
d% < 16.7%
d% > 16.7%
60
d% < 21.4%
d% > 21.4%
70
d% < 26.9%
d% > 26.9%
80
d% < 33.3%
d% > 33.3%
90
d% < 40.9%
d% > 40.9%
100
d% < 50.0%
d% > 50.0%
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