Danfoss AHF 010 Design Manual page 44

Programming
[28] Catch up
[29] Slow
down
[30] Counter
6 6
input
[31] Pulse
edge
triggered
[32] Pulse
time-
based
[34] Ramp bit
0
42
VLT
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.
Increases reference value by percentage
(relative) set in parameter 3-12 Catch up/slow
Down Value.
Reduces reference value by percentage (relative)
set in parameter 3-12 Catch up/slow Down Value.
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.
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
Illustration 6.1 Pulse Flanks per Sample Time
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]
a Time[sec] b Time[sec]
a: Low encoder b: Standard encoder
resolution resolution
Pulse
Timer
Sample time
Time counter
Time Start Read Timer: Read Timer:
20 timer tides 20 timer tides
Illustration 6.2 Duration Between Pulse
Flanks
Enables a selection between 1 of the 4 ramps
available, according to Table 6.5.
Danfoss A/S © 05/2019 All rights reserved.
®
Advanced Harmonic Filter AHF 005/AHF 010
[35] Ramp bit
1
Preset ramp bit
Ramp 1
Ramp 2
Ramp 3
Ramp 4
Table 6.5 Preset Ramp Bit
[40] Latched
Precise
Start
[41] Latched
Precise
Stop
inverse
[51] External
interlock
[55] DigiPot
Increase
[56] DigiPot
Decrease
[57] DigiPot
Clear
[60] Counter A
[61] Counter A
[62] Reset
Counter A
[63] Counter B
[64] Counter B
[65] Reset
Counter B
[70] Mech.
Brake
Feedback
Same as [34] Ramp bit 0.
1
0
0
1
1
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.
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.
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 potentiometer
function described in parameter group 3-9*
Digital Pot. Meter.
Decrease signal to the digital potentiometer
function described in parameter group 3-9*
Digital Pot. Meter.
Clears the digital potentiometer reference
described in parameter group 3-9* Digital Pot.
Meter.
(Terminal 29 or 33 only). Input for increment
counting in the SLC counter.
(Terminal 29 or 33 only). Input for decrement
counting in the SLC counter.
Input for reset of counter A.
(Terminal 29 or 33 only). Input for increment
counting in the SLC counter.
(Terminal 29 or 33 only). Input for decrement
counting in the SLC counter.
Input for reset of counter B.
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.
0
0
1
0
1
MG80C602