Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual page 81

How to Programme the Low Ha...
[23] Set-up
select bit
0
[24] Set-up
select bit
1
[26] Precise
stop inv.
[27] Precise
start, stop
6 6
[28] Catch up
[29] Slow
down
[30] Counter
input
[31] Pulse
edge
triggered
[32] Pulse time
based
80
VLT Automation Low Harmonic Drive Operating Instructions
Select Set-up select bit 0 or Select Set-up select
bit 1 to select one of the four set-ups. Set
0-10 Active Set-up to Multi Set-up.
(Default Digital input 32): Same as Set-up select
bit 0 [23].
Sends an inverted stop signal when the precise
stop function is activated in 1-83 Precise Stop
Function.
Precise stop inverse function is available for
terminals 18 or 19.
Use when Precise ramp stop [0] is selected in
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 will 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.
Increases reference value by percentage
(relative) set in 3-12 Catch up/slow Down Value.
Reduces reference value by percentage (relative)
set in 3-12 Catch up/slow Down Value.
Precise stop function in 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
1-84 Precise Stop Counter Value.
Edge triggered pulse input counts 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 6.11
Time based pulse input measures the duration
between flanks. This gives a higher resolution at
lower frequencies, but is not as precise at
higher frequencies. This principle has a cut-off
MG34O202 - VLT
frequency which makes it unsuited for encoders
with very low resolutions (e.g. 30 ppr) at low
speeds.
a: very low encoder
resolution
Table 6.8
Illustration 6.12
[34] Ramp bit Enables a choice between one of the 4 ramps
0 available, according to the table below.
[35] Ramp bit Same as Ramp bit 0.
1
Preset ramp bit
Ramp 1
Ramp 2
Ramp 3
Ramp 4
Table 6.9
[40] Latched
Precise Start
[41] Latched
Precise Stop
inverse
[51] External
interlock
[55] DigiPot
Increase
®
is a registered Danfoss trademark
Speed [rpm] Speed [rpm]
a Time[sec] b Time[sec]
b: standard encoder
resolution
Pulse
Timer
Sample time
Time counter
Time Start Read Timer: Read Timer:
20 timer tides 20 timer tides
1
0
0
1
1
A latched Precise Start only requires a pulse
of 3ms on T18 or T19.
When using for 1-83 [1] or [2]:
When the reference is reached, the
frequency converter will internally enable
the Precise Stop signal. This means that the
frequency converter will do 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 drive. 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*
0
0
1
0
1