Danfoss VLT AutomationDrive Programming Manual Download Page 76

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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/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.

Shut down

Catch up

Unchanged speed

Reduced by %-value

Increased by %-value

Reduced by %-value

[22] Slow

Same as Speed up [21].

[23] Set-up

select bit
0

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.

[24] Set-up

select bit
1

(Default Digital input 32): Same as Set-up select
bit 0 [23].

[26] Precise

stop inv.

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.

[27] Precise

start, stop

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 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.

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-

down

Reduces reference value by percentage (relative)
set in

3-12 Catch up/slow Down Value

[30] Counter

input

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

[31] Pulse

edge
triggered

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

130BB463.10

[32] Pulse time

based

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
frequency which makes it unsuited for encoders
with very low resolutions (e.g., 30 ppr) at low
speeds.

Speed [rpm]

Time[sec]

130BB462.10

a: very low encoder
resolution

b: standard encoder
resolution

Read Timer:

20 timer tides

Read Timer:

20 timer tides

Time Start

Time counter

Sample time