VLT
®
5000 Series
gal/h
[33]
ft
3
/h
[34]
lb/s
[35]
lb/min
[36]
lb/h
[37]
lb ft
[38]
ft/s
[39]
ft/min
[40]
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 refer-
ence (parameters 204/205) and i.
The possibility of choosing a unit in parameter 416
will depend on the choices made in the following pa-
rameters:
Par. 002 Local/remote control.
Par. 013 Local control/config. as par. 100.
Par. 100 Configuration.
S
elect 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 con-
nected 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 )orNm(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.
S
elect parameter 002 as Local control
If parameter 013 is chosen as LCP control and open
loop or LCP digital control and open loop , the ref-
erence will be given in Hz, regardless of the choice
made in parameter 416. A feedback or process sig-
nal connected to terminal 53, 60 or 33 (pulse), will,
however, be displayed in the form of the unit se-
lected in parameter 416. If parameter 013 is chosen
as LCP control/as par. 100 or LCP digital control/as
par. 100 , the unit will be as described above under
parameter 002, Remote-control.
NB!:
The above applies to display of Reference
[unit] and Feedback [unit] .IfReference [%]
or 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
417 Speed PID proportional gain
(SPEED PROP GAIN)
Value:
0.000 (OFF) - 0.150
✭ 0.015
Function:
Proportional gain indicates how many times the fault
(deviation between the feedback signal and the set-
point) 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 be-
come unstable in the case of overshooting.
418
418 Speed PID integral time
(SPEED INT. TIME)
Value:
2.00 - 999.99 ms (1000 = OFF)
✭ 8ms
Function:
The integral time determines how long the PID regu-
lator 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 damp-
ening 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 the process
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.51.A1.02 - VLT is a registered Danfoss trade mark
148
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