Danfoss VLT AutomationDrive FC 301 Programming Manual page 120

Parameter Descriptions
3 3
[32] Pulse
time-
based
[34] Ramp bit
0
[35] Ramp bit
1
Preset ramp bit
Ramp 1
Ramp 2
Ramp 3
Ramp 4
Table 3.20 Preset Ramp Bit
[40] Latched
Precise
Start
[41] Latched
Precise
118
VLT
Pulse
Sample time
Illustration 3.35 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 3.36 Duration Between Pulse
Flanks
Enables a selection between 1 of the 4 ramps
available, according to Table 3.20.
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
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®
AutomationDrive FC 301/302
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
[80] PTC Card 1
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 the signal to the digital potenti-
ometer function described in parameter group
3-9* Digital Pot. Meter.
Decrease the signal to the digital potenti-
ometer 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 to
[7] Extended PID Speed OL or [8] Extended PID
Speed CL.
All digital inputs can be set to [80] PTC Card
1. However, only 1 digital input must be set
to this option.
M0013101