Honeywell SmartVFD HVAC MR4, User Manual

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HVAC A
PPLICATION
Honeywell
• 68
Table 53. Selection of preset frequencies; = input activated
M3.4.1 R
AMP
1
SHAPE
The start and end of acceleration and deceleration ramps can be smoothed with this parame-
ter. Setting value 0 gives a linear ramp shape which causes acceleration and deceleration to
act immediately to the changes in the reference signal.
Setting value 0.1…10 seconds for this parameter produces an S-shaped acceleration/deceler-
ation. The acceleration time is determined with parameters M3.4.2 and M3.4.3. See Figure 10.
These parameters are used to reduce mechanical erosion and current spikes when the refer-
ence is changed.
Figure 10.Acceleration/Deceleration (S-shaped)
M3.4.8 R
AMP TIME OPTIMIZER
If the ramp time optimizer is enabled the deceleration time will be increased by the percentage
defined in parameter M3.4.9
Ramp optimizing percentage every time we hit the overvoltage
controller during deceleration or acceleration time when hitting the current limit during acceler-
ation. There is also a parameter for setting a max limit for the ramp (M3.4.10). The ramp opti-
mizer will not stretch the ramps above this limit.
Required action Activated frequency
Choose value 1 for parame-
ter M3.3.3
Preset frequency 0
B2 B1 B0 Preset frequency 1
B2 B1 B0 Preset frequency 2
B2 B1 B0 Preset frequency 3
B2 B1 B0 Preset frequency 4
B2 B1 B0 Preset frequency 5
B2 B1 B0 Preset frequency 6
B2 B1 B0 Preset frequency 7
M3.4.2, M3.4.3
[Hz]
[t]
M3.4.1
M3.4.1
100K27