ACH550-UH User’s Manual
1-121
Parameters
Group 22: ACCEL/DECEL
This group defines ramps that control the rate of acceleration and deceleration. You
define these ramps as a pair, one for acceleration and one for deceleration. You can
define two pairs of ramps and use a digital input to select one or the other pair.
Group 22: Accel/Decel
Code Description Range
Resolution
Default
S
2201
ACC/DEC 1/2 SEL
-6…7
1
0 (
NOT
SEL
)
Defines control for selection of acceleration/deceleration ramps.
• Ramps are defined in pairs, one each for acceleration and deceleration.
• See below for the ramp definition parameters.
0 =
NOT
SEL
– Disables selection, the first ramp pair is used.
1 =
DI
1 – Defines digital input
DI
1 as the control for ramp pair selection.
• Activating the digital input selects ramp pair 2.
• De-activating the digital input selects ramp pair 1.
2…6 =
DI
2…
DI
6 – Defines digital input
DI
2…
DI
6 as the control for ramp pair selection.
• See
DI
1 above.
7 =
COMM
– Defines bit 10 of the Command Word 1 as the control for ramp pair selection.
• The Command Word is supplied through fieldbus communication.
• The Command Word is parameter 0301.
-1 =
DI
1(
INV
) – Defines an inverted digital input
DI
1 as the control for ramp pair selection.
• De-activating the digital input selects ramp pair 2
• Activating the digital input selects ramp pair 1.
-2…-6 =
DI
2(
INV
)…
DI
6(
INV
) – Defines an inverted digital input
DI
2…
DI
6 as the control for ramp pair selection.
• See
DI
1(
INV
) above.
2202
ACCELER TIME 1
0.0…1800.0 s
0.1 s
30.0 s
Sets the acceleration time for zero to maximum frequency for ramp pair 1. See A
in the figure.
• Actual acceleration time also depends on 2204
RAMP
SHAPE
1.
• See 2008
MAXIMUM
FREQ
.
2203
DECELER TIME 1
0.0…1800.0 s
0.1 s
30.0 s
Sets the deceleration time for maximum frequency to zero for ramp pair 1.
• Actual deceleration time also depends on 2204
RAMP
SHAPE
1.
• See 2008
MAXIMUM
FREQ
.
2204
RAMP SHAPE 1
0.0...1000.0 s
0.1 s
0.0 s (
LINEAR
)
Selects the shape of the acceleration/deceleration ramp for ramp pair 1. See B in the figure.
• Shape is defined as a ramp, unless additional time is specified here to reach the maximum frequency. A longer
time provides a softer transition at each end of the slope. The shape becomes an s-curve.
• Rule of thumb: 1/5 is a suitable relation between the ramp shape time and the acceleration ramp time.
0.0 =
LINEAR
– Specifies linear acceleration/deceleration ramps for ramp pair 1.
0.1…1000.0 =
S
-
CURVE
– Specifies s-curve acceleration/deceleration ramps for ramp pair 1.
FREQ
MAX
FREQ
Linear
S-curve
A
A = 2202
ACCELER
TIME
1
B
B (=0)
B = 2204
RAMP
SHAPE
1
MAX
T
T
Summary of Contents for ACH550-UH HVAC
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Page 8: ...1 8 ACH550 UH User s Manual Table of contents ...
Page 32: ...1 32 ACH550 UH User s Manual Installation ...
Page 66: ...1 66 ACH550 UH User s Manual Application macros ...
Page 186: ...1 186 ACH550 UH User s Manual Parameters ...
Page 333: ...ACH550 UH User s Manual 1 333 Technical data ...
