HVAC A
PPLICATION
Honeywell
• 38
3.5.6
Group 3.4: Ramp & Brakes Setup
Two ramps are available (two sets of acceleration time, deceleration time and ramp shape).
The second ramp can be activated by a frequency threshold or a digital input.
NOTE:
Ramp 2
always has higher priority and is used if a digital input for ramp selection is activated or Ramp
2 threshold is smaller than RampFreqOut.
Code
Parameter
Min
Max
Unit
Default
ID
Description
M3.4.1
Ramp 1 shape
0.0
10.0
s
0.0
500 S-curve time ramp 1
M3.4.2
Acceleration time 1
0.1
300.0
s
Varies
103
Defines the time required for
the output frequency to
increase from zero frequency
to maximum frequency
M3.4.3
Deceleration time 1
0.1
300.0
s
Varies
104
Defines the time required for
the output frequency to
decrease from maximum fre-
quency to zero frequency
M3.4.4
Ramp 2 threshold
0.00
M3.3.2
Hz
0.00
526
Ramp 2 is activated when
output frequency exceeds
this limit (compared to fre-
quency output from ramp
generator).
0=Not in use.
Ramp 2 can also be forced
with a digital input.
M3.4.5
Ramp 2 shape
0.0
10.0
s
0.0
501 See M3.4.1.
M3.4.6
Acceleration time 2
0.0
300.0
s
10.0
502 See M3.4.2.
M3.4.7
Deceleration time 2
0.0
300.0
s
10.0
503 See M3.4.3.
M3.4.8
Ramp time optimizer
0
1
Varies
1808
0=Disable
1=Enable
M3.4.9
Ramp optimizing per-
centage
0.0
50.0
%
10.0
1809
Defines how big step
changes in acceleration and
deceleration times are
allowed.
10.0% means that when run-
ning against the overvoltage
controller at ramp down, the
deceleration time is
increased with 10.0% of the
momentary value.
M3.4.10
Ramp optimizing max
time
0.0
3000.0
s
Varies
1810
Ramp time optimizer does
not increase the ramp over
this limit.
M3.4.11 Start magnetizing time
0,00
600,00
s
0,00
516
This parameter defines the
time for how long DC current
is fed to motor before accel-
eration starts.
M3.4.12
Start magnetizing cur-
rent
Varies
Varies
A
Varies
517
M3.4.13
DC braking time at
stop
0,00
600,00
s
0,00
508
Determines if braking is ON
or OFF and the braking time
of the DC-brake when the
motor is stopping.
Summary of Contents for SmartVFD HVAC MR4
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