Danfoss VLT FCD 303 Operating Instructions Manual page 65

data selections contain a precise stop routine, thus
ensuring a high level of repeat accuracy.
The selections are a combination of the
functions described below.
NB!:
Pulse start [8] may not be used together
with the precise stop function.
Description of choice:
Precise ramp stop [0] is selected to achieve high
repetiti v e precision at the stopping point.
Counter stop. Once it has recei v ed a pulse start
signal the frequency converter runs until the number of
pulses programmed by the user have been recei v ed at
input terminal 33. In this way an internal stop signal will
acti v ate the normal ramp down time (parameter 208).
The counter function is acti v ated (starts timing) at
the flank of the start signal (when it changes
from stop to start).
Speed compensated stop. To stop at precisely
the same point, regardless of the present speed,
a stop signal recei v ed is delayed internally when
the present speed is lower than the maximum
speed (set in parameter 202).
Reset. Counter stop and Speed-compensated stop
can be combined with or without reset.
Counter stop with reset [1]. After each precise
stop the number of pulses counted during
ramp down 0 Hz is reset.
Counter stop without reset [2]. The number of pulses
counted during ramp down to 0 Hz is deducted
from the counter value in parameter 344.
344 Counter value
(PULSE COUNT PRE.)
Value:
0 - 999999
Function:
In this parameter you can select the counter
value to be used in the integrated precise stop
function (parameter 343).
Description of choice:
The factory setting is 100000 pulses. The highest
frequency (max. resolution) that can be registered
at terminal 33 is 67.6 kHz.
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.04.B7.02 - VLT is a registered Danfoss trademark
349 Speed comp delay
Value:
0 ms - 100 ms
Function:
In this parameter the user can set the system's
delay time (Sensor, PLC, etc.). If you are running
speed-compensated stop, the delay time at
different frequencies has a major influence on
the way in which you stop.
Description of choice:
The factory setting is 10 ms. This means that it is
assumed that the total delay from the Sensor, PLC
and other hardware corresponds to this setting.
100000 pulses
®
VLT FCD Series
(SPEED COMP DELAY)
NB!:
Only acti v e for speed-compensated stop.
10 ms
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