Technical data
VLT
®
2800 Series
Programming
416 Process units
(REF/FEEDB. UNIT)
Value:
✭No unit (NO UNIT)
[0]
%(%)
[1]
ppm (PPM)
[2]
rpm (RPM)
[3]
bar (BAR)
[4]
Cycles/min (CYCLE/MI)
[5]
Pulses/s (PULSE/S)
[6]
Units/s (UNITS/S)
[7]
Units/min. (UNITS/MI)
[8]
Units/h (UNITS/H)
[9]
°C (°C)
[10]
Pa (PA)
[11]
l/s (L/S)
[12]
m
3
/s (M
3
/S)
[13]
l/min. (L/M)
[14]
m
3
/min. (M
3
/MIN)
[15]
l/h (L/H)
[16]
m
3
/h (M
3
/H)
[17]
Kg/s (KG/S)
[18]
Kg/min. (KG/MIN)
[19]
Kg/hour (KG/H)
[20]
Tons/min. (T/MIN)
[21]
Tons/hour (T/H)
[22]
Metres (M)
[23]
Nm (NM)
[24]
m/s (M/S)
[25]
m/min. (M/MIN)
[26]
°F (°F)
[27]
In wg (IN WG)
[28]
gal/s (GAL/S)
[29]
Ft
3
/s (FT
3
/S)
[30]
Gal/min. (GAL/MIN)
[31]
Ft
3
/min. (FT
3
/MIN)
[32]
Gal/h (GAL/H)
[33]
Ft
3
/h (FT
3
/H)
[34]
Lb/s (LB/S)
[35]
Lb/min. (LB/MIN)
[36]
Lb/hour (LB/H)
[37]
Lb ft (LB FT)
[38]
Ft/s (FT/S)
[39]
Ft/min. (FT/MIN)
[40]
Function:
Select among different units to be shown on the
display. The unit is read out if an LCP control
unit can be connected, and if Reference [unit] [2]
or Feedback [unit] [3] has been selected in one
of parameters 009-012 Display read-out,andin
Display mode. The unit is used in Closed loop
also as a unit for Minimum/Maximum reference
and Minimum/Maximum feedback.
Description of choice:
Select the required unit for the reference/feed-
back signal.
NB!:
Parameters 417-421 are only used, if in
parameter 100 Configuration the selection
made is Speed regulation, closed loop [1].
417 Speed PID proportional gain
(SPEED PROP GAIN)
Value:
0.000 (OFF) - 1.000
✭ 0.010
Function:
Proportional gain indicates how many times the
fault (deviation between the feedback signal and
the setpoint) is to be amplified.
Description of choice:
Quick regulation is obtained at high amplification,
but if the amplification is too high, the process may
become unstable in the case of overshooting.
418 Speed PID integral time
(SPEED INT. TIME)
Value:
20.00 - 999.99 ms (1000 = OFF)
✭ 100 ms
Function:
The integral time determines how long the PID
regulator takes to correct the error. The greater
the error, the quicker the integrator frequency
contribution will increase. The integral time is the
time the integrator needs to achieve the same
change as the proportional amplification.
Description of choice:
Quick regulation 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 regulator will take long
to regulate if an error has occurred.
✭ = factory setting. () = display text [] = value for use in communication via serial communication port
MG.28.A9.02 - VLT is a registered Danfoss trademark
47