Danfoss VLT AutomationDrive FC 301 Programming Manual page 119

Parameter Descriptions
[18] Preset ref Same as [16] Preset ref bit 0.
bit 2
Preset ref. bit
Preset ref. 0
Preset ref. 1
Preset ref. 2
Preset ref. 3
Preset ref. 4
Preset ref. 5
Preset ref. 6
Preset ref. 7
Table 3.18 Preset Reference Bit
[19] Freeze Freezes the actual reference, which is now the
ref point of enable/condition to be used for [21] Speed
up and [22] Speed down. If speed up/speed 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.
[20] Freeze Freezes the actual motor frequency (Hz), which is
output now the point of enable/condition to be used for
[21] Speed up and [22] Speed down. If speed up/
speed 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.
[21] Speed Select [21] Speed up and [22] Speed down for digital
up control of the up/down speed (motor potenti-
ometer). Activate this function by selecting either
[19] Freeze ref or [20] Freeze output. When speed
up/speed down is activated for less than 400 ms,
the resulting reference is increased/decreased by
0.1%. If speed up/speed down is activated for
more than 400 ms, the resulting reference follows
the setting in ramping up/down parameters 3-
x1/3-x2.
Unchanged speed
Reduced by %-value
Increased by %-value
Reduced by %-value
Table 3.19 Shut Down/Catch Up
[22] Speed Same as [21] Speed up.
down
M0013101
Programming Guide
2 1 0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Shut down Catch up
0 0
1 0
0 1
1 1
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[23] Set-up Select [23] Set-up select bit 0 or select [24] Set-up
select bit select bit 1 to select 1 of the 4 set-ups. Set
0 parameter 0-10 Active Set-up to Multi Set-up.
[24] Set-up (Default digital input 32): Same as [23] Set-up
select bit select bit 0.
1
[26] Precise Sends an inverted stop signal when the precise
stop inv. stop function is activated in
parameter 1-83 Precise Stop Function.
Precise stop inverse function is available for
terminals 18 or 19.
[27] Precise Use when [0] Precise ramp stop is selected in
start, stop parameter 1-83 Precise Stop Function.
Precise start, stop is available for terminals 18
and 19.
Precise start ensures that the rotor turning
angle from standing still to reference is the
same for each start (for same ramp time, same
setpoint). This function is the equivalent to the
precise stop where the rotor turning angle from
reference to standing still is the same for each
stop.
When using parameter 1-83 Precise Stop Function
option [1] Cnt stop with reset or [2] Cnt stop w/o
reset:
The frequency converter needs a precise stop-
signal before reaching the value of
parameter 1-84 Precise Stop Counter Value. If this
signal is not supplied, the frequency converter
does not stop when the value in
parameter 1-84 Precise Stop Counter Value is
reached.
Trigger precise start, stop by a digital input. The
function is available for terminals 18 and 19.
[28] Catch up Increases reference value by percentage
(relative) set in parameter 3-12 Catch up/slow
Down Value.
[29] Slow Reduces reference value by percentage (relative)
down set in parameter 3-12 Catch up/slow Down Value.
[30] Counter Precise stop function in parameter 1-83 Precise
input 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.
[31] Pulse Counts the number of pulse flanks per sample
edge time. This gives a higher resolution at high
triggered frequencies, but is not as precise at lower
frequencies. Use this pulse principle for
encoders with low resolution (for example 30
PPR).
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