Danfoss VLT 2800 Series, Operating Instructions Manual

Page: 44 / 103

Description of choice:
Set the required frequency.
343 Precise stop function
(Precise stop)
Value:
Precise ramp stop (normal) [0]
Counter stop with reset
(Count stop reset)
[1]
Counter stop without reset
(Count stop no reset)
[2]
Speed-compensated stop (Spd cmp stop) [3]
Speed-compensated counter stop with reset
(Spd cmp cstop w. res)
[4]
Speed-compensated counter stop without re-
set
(Spd cmp cstop no res)
[5]
Function:
In this parameter you select which stop function is per-
formed in response to a stop command. All six data
selections contain a precise stop routine, thus ensur-
ing a high level of repeat accuracy.
The selections are a combination of the functions de-
scribed 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 re-
petitive precision at the stopping point.
Counter stop . Once it has received a pulse start signal
the frequency converter runs until the number of pul-
ses programmed by the user have been received at
input terminal 33. In this way an internal stop signal will
activate 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 pa-
rameter 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
100000 pulses
Function:
In this parameter you can select the counter value to
be used in the integrated precise stop function (pa-
rameter 343).
Description of choice:
The factory setting is 100000 pulses. The highest fre-
quency (max. resolution) that can be registered at
terminal 33 is 67.6 kHz.
349 Speed comp delay
(SPEED COMP DELAY)
Value:
0 ms - 100 ms
10 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 frequen-
cies 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 as-
sumed that the total delay from the Sensor, PLC and
other hardware corresponds to this setting.
NB!
Only active for speed-compensated stop.
VLT
®
2800 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.27.A2.02 - VLT
®
is a registered Danfoss trademark 43
Programming