Danfoss VLT 2800 Manual page 97

Maximum feedback, FB
415
(Max. feedback)
Value:
FB - 100,000.000
MIN
Function:
See description of parameter 414 Minimum feedback,
FB .
MIN
Description of choice:
Set the value to be shown on the display when the
maximum feedback has been obtained on the selected
feedback input (parameter 308/314 Analogue inputs).
416 Process units
(REF/FEEDB. UNIT)
Value:
No unit (No unit)
% (%)
ppm (ppm)
rpm (rpm)
bar (bar)
Cycles/min (CYCLE/MI)
Pulses/s (PULSE/S)
Units/s (UNITS/S)
Units/min. (UNITS/MI)
Units/h (Units/h)
°C (°C)
Pa (pa)
l/s (l/s)
3
m /s (m3/s)
l/min. (l/m)
3
m /min. (m3/min)
l/h (l/h)
3
m /h (m3/h)
Kg/s (kg/s)
Kg/min. (kg/min)
Kg/hour (kg/h)
Tons/min. (T/min)
Tons/hour (T/h)
Metres (m)
Nm (nm)
m/s (m/s)
m/min. (m/min)
°F (°F)
In wg (in wg)
gal/s (gal/s)
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.27.E2.02 - VLT is a registered Danfoss trademark
MAX Ft
Gal/min. (gal/min)
Ft
1500.000
Gal/h (gal/h)
Ft
Lb/s (lb/s)
Lb/min. (lb/min)
Lb/hour (lb/h)
Lb ft (lb ft)
Ft/s (ft/s)
Ft/min. (ft/min)
Function:
Select among different units to be shown on the dis-
play. 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
[0]
009-012 Display read-out, and in Display mode. The
[1]
unit is used in Closed loop also as a unit for Minimum/
Maximum reference and Minimum/Maximum feed-
[2]
back.
[3]
[4]
Description of choice:
[5]
Select the required unit for the reference/feedback sig-
[6]
nal.
[7]
[8]
VLT 2800 Regulators
[9]
The VLT 2800 has two integrated PID regulators, one
[10]
to regulate speed and one to regulate processes.
[11]
Speed regulation and process regulation require a
[12]
feedback signal back to an input. There are a number
of settings for both PID regulators that are made in the
[13]
same parameters, but selection of regulator type will
[14]
affect the selections that have to be made in the shared
[15]
parameters.
[16]
In parameter 100 Configuration it is possible to select
[17]
regulator type, Speed regulation, closed loop [1] or
[18]
Process regulation, closed loop [3].
[19]
Speed regulation
[20]
This PID regulation is optimised for use in applications
[21] in which there is a need to maintain a particular motor
speed. The parameters that are specific for the speed
[22]
regulator are parameter 417 to parameter 421.
[23]
Process regulation
[24]
The PID regulator maintains a constant process mode
[25]
(pressure, temperature, flow, etc.) and adjusts the mo-
[26]
tor speed on the basis of the reference/setpoint and
[27]
feedback signal.
[28]
A transmitter provides the PID regulator with a feed-
[29]
back signal from the process as an expression of the
3
/s (ft3/s)
3
/min. (Ft3/min)
3
/h (Ft3/h)
[30]
[31]
[32]
[33]
[34]
[35]
[36]
[37]
[38]
[39]
[40]
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