Danfoss VLT 2800 Design Manual page 93

Programming
Description of choice:
[0] Precise ramp stop is selected to achieve high repetitive
precision at the stopping point.
Counter stop. Once it has received a pulse start signal, the
frequency converter runs until the number of programmed
pulses has been received at input terminal 33. In this way,
an internal stop signal activates the normal ramp down
time (parameter 208).
The counter function is activated (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
received 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. After each precise stop the number
of pulses counted during ramp down 0 Hz is reset.
Counter stop without reset. The number of pulses counted
during ramp down to 0 Hz is deducted from the counter
value in parameter 344.
WARNING
Do not use [8] Pulse start with the precise stop function.
344 Counter value
Value:
0 - 999999
Function:
Use this parameter to 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
(maximum-resolution) that can be registered at terminal 33
is 67.6 kHz.
349 Speed comp. delay
Value:
0 ms - 100 ms
Function:
Set the system's delay time (Sensor, PLC, etc.). For a speed-
compensated stop, the delay time at different frequencies
has a major influence on the way of the 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.
NOTICE
Only active for speed-compensated stop.
MG27E402
Design Guide
100000 pulses
10 ms
Danfoss A/S © Rev. May/2014 All rights reserved.
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