The frequency converter needs a precise stop-
signal before reaching the value of
parameter 1-84 Precise Stop Counter Value
. If this
signal is not supplied, the frequency converter
does not stop when the value in
parameter 1-84 Precise Stop Counter Value
is
reached.
Trigger precise start, stop by a digital input. The
function is available for terminals 18 and 19.
[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
.
[30] Counter
input
Precise stop function in
parameter 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
parameter 1-84 Precise Stop Counter Value
.
[31] Pulse
edge
triggered
Counts the 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 low resolution (for example 30
PPR).
Pulse
Sample time
130BB463.10
Illustration 6.1 Pulse Flanks per Sample Time
[32] Pulse
time-
based
Measures the duration between pulse flanks.
This gives a higher resolution at lower
frequencies, but is not as precise at higher
frequencies. This principle has a cutoff
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 6.2 Duration Between Pulse
Flanks
[34] Ramp bit
0
Enables a selection between 1 of the 4 ramps
available, according to
[35] Ramp bit
1
Same as
[34] 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 6.5 Preset Ramp Bit
[40]
Latched
Precise
Start
A latched precise start only requires a pulse
of 3 ms on terminals 18 or 19.
When using for
parameter 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
parameter 1-84 Precise Stop
Counter Value
is reached.
[41]
Latched
Precise
Stop
inverse
Sends a latched stop signal when the precise
stop function is activated in
parameter 1-83 Precise Stop Function
. The
latched precise stop inverse function is
available for terminals 18 or 19.
[51]
External
interlock
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.
[55]
DigiPot
Increase
Increase signal to the digital potentiometer
function described in
parameter group 3-9*
Digital Pot. Meter
.
[56]
DigiPot
Decrease
Decrease signal to the digital potentiometer
function described in
parameter group 3-9*
Digital Pot. Meter
.
[57]
DigiPot
Clear
Clears the digital potentiometer reference
described in
parameter group 3-9* Digital Pot.
Meter
.
[60]
Counter A
(Terminal 29 or 33 only). Input for increment
counting in the SLC counter.
[61]
Counter A
(Terminal 29 or 33 only). Input for decrement
counting in the SLC counter.
[62]
Reset
Counter A
Input for reset of counter A.
[63]
Counter B
(Terminal 29 or 33 only). Input for increment
counting in the SLC counter.
[64]
Counter B
(Terminal 29 or 33 only). Input for decrement
counting in the SLC counter.
[65]
Reset
Counter B
Input for reset of counter B.
[70]
Mech.
Brake
Feedback
Brake feedback for hoisting applications: Set
parameter 1-01 Motor Control Principle
to
[3]
Flux w/ motor feedback
; set
parameter 1-72 Start Function
to
[6] Hoist
mech brake Ref.
Programming
VLT
®
Advanced Harmonic Filter AHF 005/AHF 010
42
Danfoss A/S © 05/2019 All rights reserved.
MG80C602
6
6
Содержание AHF 010
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