434
Torque control, open loop Integration
time
(TOR-OL INT.TIME)
Value:
0.002 - 2.000 sec.
0.02 sec.
Function:
The integrator provides an increasing gain if there is a
constant error between reference and current meas-
uring signal. The greater the error, the quicker the gain
increases. The integral time is the time required by the
integrator to reach the same gain as the proportional
gain.
Used together with Torque control, open loop (param-
eter 100).
Description of choice:
Fast control is obtained if the integral time is short.
However, this time may become too short, in which
case the process may become unstable.
437 Process PID Normal/inverse control
(PROC NO/INV CTRL)
Value:
Normal (NORMAL) [0]
Inverse (INVERSE) [1]
Function:
It is possible to choose whether the process regulator
is to increase/reduce the output frequency. This is
done by having a difference between the reference
signal and the feedback signal.
Used together with Process control, closed-loop (pa-
rameter 100).
Description of choice:
If the adjustable frequency drive is to reduce the output
frequency in case the feedback signal increases, se-
lect Normal [0].
If the adjustable frequency drive is to increase the out-
put frequency in case the feedback signal increases,
select Inverse [1].
438 Process PID anti windup
(PROC ANTI WINDUP)
Value:
Off (DISABLE) [0]
On (ENABLE) [1]
Function:
It is possible to select whether the process regulator is
to continue regulating on an error even if it is not pos-
sible to increase/reduce the output frequency.
Used together with Process control, closed loop (pa-
rameter 100).
Description of choice:
The factory setting is Enable [1], which means that the
integration link is adjusted in relation to the actual out-
put frequency if either the current limit or the max./min.
frequency has been reached. The process regulator
will not engage again until either the error is zero or its
sign has changed.
Select Disable [0] if the integrator is to continue inte-
grating on an error, even if it is not possible to remove
the fault by such control.
NOTE
If Disable [0] is selected, it will mean that
when the error changes its sign, the inte-
grator will first have to integrate down from
the level obtained as a result of the former
error, before any change to the output fre-
quency occurs.
439 Process PID start frequency
(PROC START VALUE)
Value:
f
MIN
-f
MAX
(parameter 201 and
202)
parameter 201
Function:
When the start signal comes, the adjustable frequency
drive will react in the form of Speed control, open
loop following the ramp. Only when the programmed
start frequency has been obtained, will it change over
to Process control, closed loop . In addition, it is pos-
sible to set a frequency that corresponds to the speed
VLT
®
5000 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.51.C5.22 - VLT
p
is a registered Danfoss trademark. 135
Programming
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