Danfoss VLT AutomationDrive FC 301 Programming Manual page 207

Programming Guide | VLT® AutomationDrive FC 301/FC 302
Table 29: Digital Inputs, Function Descriptions - 3
Option
[24] Set-up select bit 1
[26] Precise stop inv.
[27] Precise start, stop
[28] Catch up
[29] Slow down
[30] Counter input
[31] Pulse edge triggered
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(continued)
Function
(Default digital input 32): Same as [23] Set-up select bit 0.
Sends an inverted stop signal when the precise stop function is
activated in parameter 1-83 Precise Stop Function. Precise stop
inverse function is available for terminals 18 or 19.
Use when [0] Precise ramp stop is selected in parameter 1-83 Pre-
cise Stop Function. Precise start, stop is available for terminals 18
and 19. Precise start ensures that the rotor turning angle from
standing still to reference is the same for each start (for same
ramp time, same setpoint). This function is the equivalent to the
precise stop where the rotor turning angle from reference to
standstill is the same for each stop. When using parameter 1-83
Precise Stop Function option [1] Cnt stop with resetor [2] Cnt stop
w/o reset: The drive needs a precise stop signal before reaching
the value of parameter 1-84 Precise Stop Counter Value. If this
signal is not supplied, the drive 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. Set the counter value 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
Figure 65: Pulse Flanks per Sample Time
Parameter Descriptions
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