Honeywell SmartVFD HVAC MR4 User Manual page 110

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