Danfoss VLT AutomationDrive FC 302 Programming Manual page 86

Parameter Descriptions
Preset ref. bit
Preset ref. 0
Preset ref. 1
Preset ref. 2
Preset ref. 3
3 3
Preset ref. 4
Preset ref. 5
Preset ref. 6
Preset ref. 7
Table 3.15 Preset Ref. Bit
[19] Freeze
ref
[20] Freeze
output
[21] Speed
up
Unchanged speed
Reduced by %-value
Increased by %-value
Reduced by %-value
Table 3.16 Shut Down/Catch Up
[22] Speed
down
[23] Set-up
select bit
0
84
2 1
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
Freezes the actual reference, which is now the
point of enable/condition for Speed up and Speed
down to be used. If Speed up/down is used, the
speed change always follows ramp 2
(parameter 3-51 Ramp 2 Ramp Up Time and
parameter 3-52 Ramp 2 Ramp Down Time) in the
range 0 - parameter 3-03 Maximum Reference.
Freezes the actual motor frequency (Hz), which is
now the point of enable/condition for Speed up
and Speed down to be used. If Speed up/down is
used, the speed change always follows ramp 2
(parameter 3-51 Ramp 2 Ramp Up Time and
parameter 3-52 Ramp 2 Ramp Down Time) in the
range 0 - parameter 1-23 Motor Frequency.
NOTICE
When Freeze output is active, the frequency
converter cannot be stopped via a low [8]
Start signal. Stop the frequency converter
via a terminal programmed for [2] Coasting
inverse or [3] Coast and reset inverse.
Select Speed up and Speed down if digital control
of the up/down speed is desired (motor potenti-
ometer). Activate this function by selecting either
[19] Freeze ref or [20] Freeze output. When Speed
up/down is activated for less than 400 ms, the
resulting reference is increased/decreased by 0.1%.
If Speed up/down is activated for more than 400
ms, the resulting reference follows the setting in
ramping up/down parameter 3-x1/3-x2.
Shut down
0
1
0
1
Same as [21] Speed up.
Select Set-up select bit 0 or select Set-up select
bit 1 to select 1 of the 4 set-ups. Set
parameter 0-10 Active Set-up to Multi Set-up.
Danfoss A/S © Rev. 10/2014 All rights reserved.
®
VLT AutomationDrive FC 301/302
0 [24] Set-up
select bit
0
1
1
[26] Precise
0
stop inv.
1
0
1
0
[27] Precise
1
start, stop
[28] Catch up
[29] Slow
down
[30] Counter
input
[31] Pulse
edge
triggered
Catch up
0
0
1
1
[32] Pulse
time-
based
(Default Digital input 32): Same as [23] Set-up
select bit 0.
Sends an inverted stop signal when the precise
stop function is activated in
parameter 1-83 Precise Stop Function.
Precise stop inverse function is available for
terminals 18 or 19.
Use when [0] Precise ramp stop is selected in
parameter 1-83 Precise Stop Function.
Precise start, stop is available for terminals 18
and 19.
Precise start makes sure that the angle that the
rotor turns from standing still to reference is the
same for each start (for same ramp time, same
set-point). This is the equivalent to the precise
stop where the angle that the rotor turns from
reference to standing still is the same for each
stop.
When using parameter 1-83 Precise Stop Function
option [1] or [2]:
The frequency converter needs a Precise stop
signal before the value of parameter 1-84 Precise
Stop Counter Value is reached. If this is not
supplied, the frequency converter does not stop
when the value in parameter 1-84 Precise Stop
Counter Value is reached.
Precise start, stop must be triggered by a Digital
input and is available for terminals 18 and 19.
Increases reference value by percentage
(relative) set in parameter 3-12 Catch up/slow
Down Value.
Reduces reference value by percentage (relative)
set in parameter 3-12 Catch up/slow Down Value.
Precise stop function in parameter 1-83 Precise
Stop Function acts as counter stop or speed
compensated counter stop with or without
reset. The counter value must be set in
parameter 1-84 Precise Stop Counter Value.
Counts the number of pulse flanks per sample
time. This gives a higher resolution at high
frequencies, but is not as precise at lower
frequencies. Use this pulse principle for
encoders with very low resolution (e.g. 30 ppr).
Pulse
Sample time
Illustration 3.33 Pulse Flanks per Sample
Time
Measures the duration between pulse flanks.
This gives a higher resolution at lower
frequencies, but is not as precise at higher
frequencies. This principle has a cut-off
frequency, which makes it unsuited for encoders
MG33MJ02