Danfoss VLT Midi Drive FC-280P4K0 [55/136] Notice
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Danfoss VLT Midi Drive FC-280P4K0 [55/136] Notice

Danfoss VLT Midi Drive FC-280P18K [55/136] Notice
Preset ref. bit 2 1 0
Preset ref. 0 0 0 0
Preset ref. 1 0 0 1
Preset ref. 2 0 1 0
Preset ref. 3 0 1 1
Preset ref. 4 1 0 0
Preset ref. 5 1 0 1
Preset ref. 6 1 1 0
Preset ref. 7 1 1 1
Table 4.1 Preset Ref. Bit
[19] Freeze
ref
Freezes the actual reference, which is now the
point of enable/condition for [21] Speed up and [22]
Speed down to be used. If [21] Speed up or [22]
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
output
NOTICE
When [20] Freeze output is active, the
frequency converter cannot be stopped by
setting the signal on [8] Start to low. Stop
the frequency converter via a terminal
programmed for [2] Coasting inverse or [3]
Coast and reset, inverse.
Freezes the actual motor frequency (Hz), which is
now the point of enable/condition for [21] Speed
up and [22] Speed down to be used. If [21] Speed up
or [22] 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.
[21] Speed
up
Select [21] Speed up and [22] Speed down if digital
control of the up/down speed is needed (motor
potentiometer). Activate this function by selecting
either [19] Freeze reference 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 Catch up
Unchanged speed 0 0
Reduced by %-value 1 0
Increased by %-value 0 1
Reduced by %-value 1 1
Table 4.2 Shut Down/Catch Up
[22] Speed
down
Same as [21] Speed up.
[23] Set-up
select bit
0
Select [23] Set-up select bit 0 or [1] Set-up select
bit 1 to select 1 of the 2 set-ups. Set
parameter 0-10 Active Set-up to [9] Multi Set-up.
[24] Set-up
select bit
1
Default digital input 32. Same as [23] Set-up select
bit 0.
[26] Precise
stop inv.
Precise stop inverse function is available for
terminals 18 or 19.
[27] Precise
start
stop
[28] Catch up Increases reference value by percentage (relative)
set in parameter 3-12 Catch up/slow Down Value.
[29] Slow
down
Reduces reference value by percentage (relative)
set in parameter 3-12 Catch up/slow Down Value.
[32] Pulse
time-
based
Measures the duration between pulse anks. This
parameter has a higher resolution at lower
frequencies, but is not as precise at higher
frequencies. This principle has a cut-o
frequency, which makes it unsuited for encoders
with low resolutions (for example 30 PPR) at low
speeds.
Speed [rpm] Speed [rpm]
Time[sec] Time[sec]a b
130BB462.10
a: Low encoder
resolution
b: Standard encoder
resolution
Read Timer:
20 timer tides
Read Timer:
20 timer tides
Time Start
Time counter
Sample time
Timer
Pulse
130BB464.10
Illustration 4.9 Duration Between Pulse Flanks
[34] Ramp bit
0
Enables a selection from the 4 ramps available,
according to Table 4.3.
[35] Ramp bit
1
Same as ramp bit 0.
Preset ramp bit 1 0
Ramp 1 0 0
Ramp 2 0 1
Ramp 3 1 0
Ramp 4 1 1
Table 4.3 Preset Ramp Bits
[40] Latched
precise
start
A latched precise start only requires a pulse
of 3 ms on terminals 18 or 19 when using
parameter 1-83 Precise Stop Function [1]
Counter stop with resetor [2] Counter stop
without reset. When the reference is reached,
the frequency converter internally enables the
precise stop signal. This means that the
frequency converter does the precise stop
when the counter value of
parameter 1-84 Precise Stop Counter Value is
reached.
Parameter Descriptions Programming Guide
MG07C202 Danfoss A/S © 03/2016 All rights reserved. 53
4 4

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