
Chapter 8 - Appendices
8 - 48
584S Frequency Inverter
APPENDIX E - S RAMP TIMES
This appendix contains a simple look up table method of calculating the response times for the s ramp for a given setpoint
step size,
d%
, and
S RAMP %
. Note, 100% is assumed to be equal to the
LIMIT FREQUENCY
.
S Ramp:
RAMP OUTPUT
TIME
Tr
d%
Which Formula?
The formula required to calculate the s 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
00
d% < 5.3%
d% > 5.3%
20
d% < 11.1%
d% > 11.1%
30
d% < 17.6%
d% > 17.6%
40
d% < 25.0%
d% > 25.0%
50
d% < 33.3%
d% > 33.3%
60
d% < 42.9%
d% > 42.9%
70
d% < 53.8%
d% > 53.8%
80
d% < 66.7%
d% > 66.7%
90
d% < 81.8%
d% > 81.8%
100
d% < 100.0%
d% > 100.0%
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