Danfoss VLT 5000 Series Operating Instructions Manual page 144

gal/min
3
ft /min
gal/h
3
ft /h
lb/s
lb/min
lb/h
lb ft
ft/s
ft/min
Function:
Choose among different units to be shown
on the display.
This unit is also used directly in Process control,
closed loop as a unit for Minimum/Maximum
reference (parameters 204/205) and i.
The possibility of choosing a unit in parameter
416 will depend on the choices made in the
following parameters:
Par. 002 Local/remote control.
Par. 013 Local control/config. as par. 100.
Par. 100 Configuration.
Select parameter 002 as Remote control
If parameter 100 is selected as Speed control, open
loop or Torque control, open loop , the unit selected in
parameter 416 can be used in displays (par. 009-12
Feedback [unit]) of process parameters.
The process parameter to be displayed can be
connected in the form of an external analogue signal to
terminal 53 (par. 308: Feedback signal) or terminal 60
(par. 314: Feedback signal), as well as in the form of a
pulse signal on terminal 33 (par. 307: Pulse feedback).
Note: The reference can only be shown in Hz ( Speed
control, open loop) or Nm (Torque control, open loop).
If par. 100 is selected as Speed control, closed loop,
parameter 416 is not active, since both reference
and feedback are always shown as RPM.
If parameter 100 is selected as Process control, closed
loop, the unit selected in parameter 416 will be used
when displaying both reference (par. 009-12: Reference
[unit]) and feedbac k (par. 009-12: Feedback [unit]).
Scaling of the display indication as a function of the
selected range (par. 309/310, 312/313, 315/316, 327
and 328) for a connected, external signal is effected
for a reference in parameters 204 and 205 and for
feedback in parameters 414 and 415.
Select parameter 002 as Local control
If parameter 013 is chosen as LCP control and
open loop or LCP digital control and open loop ,
the reference will be given in Hz, regardless of the
choice made in parameter 416. A feedback or
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.51.A9.02 - VLT is a registered Danfoss trademark
VLT
[31] process signal connected to terminal 53, 60 or 33
(pulse), will, however, be displayed in the form of the
[32]
unit selected in parameter 416. If parameter 013 is
[33]
chosen as LCP control/as par. 100 or LCP digital
[34]
control/as par. 100, the unit will be as described
[35]
above under parameter 002, Remote-control.
[36]
[37]
NB!:
[38]
The above applies to display of Reference
[39]
[unit] and Feedback [unit]. If Reference [%] or
[40]
Feedback [%] is selected, the value displayed will
be in the form of a percentage of the selected range.
Description of choice:
Select the desired unit for the reference/feedback signal.
417 Speed PID proportional gain
(SPEED PROP GAIN)
Value:
0.000 (OFF) - 0.150
Function:
Proportional gain indicates how many times the
fault (deviation between the feedback signal and
the setpoint) is to be amplified. Used together with
Speed control, closed loop (parameter 100).
Description of choice:
Quick control is obtained at high amplification, but
if the amplification is too high, the process may
become unstable in the case of overshoot.
418 Speed PID integral time
(SPEED INT. TIME)
Value:
2.00 - 999.99 ms (1000 = OFF)
Function:
The integral time determines how long the PID
regulator takes to correct the error. The greater the
error, the quicker the gain increases. The integral
time results in a delay of the signal and thus has
a dampening effect. Used together with Speed
control, closed loop (parameter 100).
Description of choice:
Quick control is obtained through a short integral time.
However, if this time is too short, it can make
the process unstable.
If the integral time is long, major deviations
from the required reference may occur, since
®
5000 Series
0.015
8 ms
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