Danfoss VLT AutomationDrive Programming Manual page 76

Parameter Descriptions
NOTE!
When Freeze output is active, the Adjustable
frequency drive cannot be stopped via a low
'start [8]' signal. Stop the Adjustable
frequency drive via a terminal programmed
for Coasting inverse [2] or Coast and reset,
inverse.
[21] Speed Select Speed up and Slow if digital control of the
up up/down speed is desired (motor potentiometer).
Activate this function by selecting either Freeze
reference or Freeze output. When Speed up/Slow
is activated for less than 400 msec, the resulting
reference will be increased/decreased by 0.1%. If
Speed up/down is activated for more than 400
msec, the resulting reference will follow the
setting in ramping up/down parameter 3-x1/ 3-x2.
Unchanged speed
Reduced by %-value
Increased by %-value
Reduced by %-value
[22] Slow Same as Speed up [21].
[23] Set-up Select Set-up select bit 0 or Select Set-up select
select bit bit 1 to select one of the four set-ups. Set
0 0-10 Active Set-up to Multi Set-up.
[24] Set-up (Default Digital input 32): Same as Set-up select
select bit bit 0 [23].
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 Adjustable frequency drive needs a Precise
Stop signal before the value of 1-84 Precise Stop
Counter Value is reached. If this is not supplied,
the Adjustable frequency drive will not stop
when the value in 1-84 Precise Stop Counter
Value is reached.
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FC 300 Programming Guide
Shut down Catch up
0 0
1 0
0 1
1 1
®
MG33MD22 - VLT is a registered Danfoss trademark
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 Edge-triggered pulse input counts number of
edge pulse flanks per sample time. This gives a higher
triggered 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
[32] Pulse time Time-based pulse input measures the duration
based between 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
with very low resolutions (e.g., 30 ppr) at low
speeds.
Speed [rpm]
a Time[sec]
a: very low encoder
resolution
Pulse
Timer
Sample time
Time counter
Time Start
[34] Ramp bit Enables a choice between one of the four
0 ramps available, according to the table below.
[35] Ramp bit Same as Ramp bit 0.
1
Speed [rpm]
b Time[sec]
b: standard encoder
resolution
Read Timer: Read Timer:
20 timer tides 20 timer tides
3-51
3 3