Danfoss VLT AHF 005 Design Manual page 52

Programming
[31] Pulse
edge
triggered
[32] Pulse
time-
6 6
based
[34] Ramp bit
0
[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
50
VLT
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.
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
Danfoss A/S © 10/2016 All rights reserved.
®
Advanced Harmonic Filter AHF 005/AHF 010
[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
[71] Mech. Brake
Feedback
0
inv.
0
[72] PID error
1
inverse
0
1
[73] PID reset I-
part
[74] PID enable
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.
Inverted brake feedback for hoisting
applications.
When enabled, this option inverts the
resulting error from the process PID
controller. Available only if
parameter 1-00 Configuration Mode is set to
[6] Surface Winder, [7] Extended PID Speed OL,
or [8] Extended PID Speed CL.
When enabled, this option resets the I-part
of the process PID controller. Equivalent to
parameter 7-40 Process PID I-part Reset.
Available only if parameter 1-00 Configuration
Mode is set to [6] Surface Winder, [7] Extended
PID Speed OL, or [8] Extended PID Speed CL.
Enables the extended process PID controller.
Equivalent to parameter 7-50 Process PID
Extended PID. Available only if
parameter 1-00 Configuration Mode is set [7]
MG80C502