Danfoss VLT AutomationDrive FC 301 Programming Manual page 79

Parameter Descriptions
[22] Speed Same as [21] Speed up.
down
[23] Set-up Select Set-up select bit 0 or Select Set-up select
select bit bit 1 to select one of the 4 set-ups. Set
0 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 1-83 Precise Stop
Function.
Precise stop inverse function is available for
terminals 18 or 19.
[27] Precise Use when Precise ramp stop [0] is selected in
start, stop 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 for 1-83 Precise Stop Function [1] or
[2]:
The frequency converter needs a Precise Stop
signal before the value of 1-84 Precise Stop
Counter Value is reached. If this is not supplied,
the frequency converter does not stop when
the value in 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.
[28] Catch up Increases reference value by percentage
(relative) set in 3-12 Catch up/slow Down Value.
[29] Slow Reduces reference value by percentage (relative)
down set in 3-12 Catch up/slow Down Value.
[30] Counter Precise stop function in 1-83 Precise Stop
input Function acts as Counter stop or speed
compensated counter stop with or without
reset. The counter value must be set in
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 very low resolution (e.g. 30 ppr).
Pulse
Sample time
Illustration 3.33 Pulse Flanks per Sample
Time
[32] Pulse time Measures the duration between pulse flanks.
based This gives a higher resolution at lower
®
VLT AutomationDrive FC 301/302 Programming Guide
[34] Ramp bit
0
[35] Ramp bit
1
Preset ramp bit
Ramp 1
Ramp 2
Ramp 3
Ramp 4
Table 3.16 Preset Ramp Bit
[40] Latched
Precise Start
[41] Latched
Precise Stop
inverse
[51] External
interlock
[55] DigiPot
Increase
MG33MH02 - Rev. 2013-09-30
frequencies, but is not as precise at higher
frequencies. This principle has a cut-off
frequency which makes it unsuited for encoders
with very low resolutions (e.g. 30 ppr) at low
speeds.
Speed [rpm] Speed [rpm]
a Time[sec] b Time[sec]
a: very low encoder b: standard encoder
resolution resolution
Table 3.15
Pulse
Timer
Sample time
Time counter
Time Start Read Timer: Read Timer:
20 timer tides 20 timer tides
Illustration 3.34 Duration Between Pulse
Flanks
Enables a choice between one of the 4 ramps
available, according to Table 3.19.
Same as Ramp bit 0.
1
0
0
1
1
A latched Precise Start only requires a pulse
of 3 ms on T18 or T19.
When using for 1-83 Precise Stop Function
[1] Cnt stop with reset or [2] Cnt stop w/o
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 1-84 Precise Stop
Counter Value is reached.
Sends a latched stop signal when the
precise stop function is activated in
1-83 Precise Stop Function. The Latched
Precise stop inverse function is available for
terminals 18 or 19.
This function makes it possible to give an
external fault to the frequency converter.
This fault is treated in the same way as an
internally generated alarm.
INCREASE signal to the Digital Potenti-
ometer function described in parameter
group 3-9* Digital Pot. Meter
3 3
0
0
1
0
1
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