Danfoss VLT Brook Crompton Motor FCM 300 Design Manual page 58

Programming
1.500.000
Function:
See description of parameter 414.
416 Reference/feedback unit
3 3
Value:
NO UNIT
%
PPM
RPM
bar
CYCLE/min
PULSE/s
UNITS/s
UNITS/min
UNITS/h
°C
Pa
l/s
3
m /s
l/min
m 3 /min
l/h
3
m /h
kg/s
kg/min
kg/h
t/min
t/h
m
Nm
m/s
m/min
°F
in wg
gal/s
3
ft /s
gal/min
3
ft /min
gal/h
ft 3 /h
lb/s
lb/min
lb/h
lb ft
ft/s
ft/min
Function:
Choose among different units to be shown on the display.
56
®
VLT DriveMotor FCM Series
This unit is also used directly in Process regulation, closed
[1500000]
loop as a unit for Minimum/Maximum reference (parameters
204/205) and Minimum/ Maximum feedback (parameters
414/415).
The possibility of choosing a unit in parameter 416 will
depend on the choices made in the following parameters:
Par. 002 Local/remote control.
[0]
Par. 013 Local control/config. as par. 100.
[1]
Par. 100 Configuration.
[2]
Select parameter 002 as Remote control
[3]
If parameter 100 is selected as Speed regulation, open loop,
the unit selected in parameter 416 can be used in displays
[4]
(par. 009-12 Feedback [unit]) of process parameters.
[5]
Note: The reference can only be shown in Hz (Speed
[6]
regulation, open loop).
[7]
If parameter 100 is selected as Process regulation, closed
[8]
loop, the unit selected in parameter 416 will be used when
[9]
displaying both reference (par. 009- 12: Reference [unit])
and feedback (par. 009-12: Feedback [unit]).
[10]
Select parameter 002 as Local control
[11]
If parameter 013 is chosen as LCP control and open loop or
[12]
LCP digital control and open loop , the reference will be
[13]
given in Hz, regardless of the choice made in parameter
[14]
416. If parameter 013 is chosen as LCP control/as par. 100
[15] or LCP digital control/as par. 100, the unit will be as
described above under parameter 002, Remote-control.
[16]
[17]
Description of choice:
[18]
Select the desired unit for the reference/feedback signal.
[19]
3.5.3 FCM 300 Regulator
[20]
[21]
Process regulation
[22]
The PID regulator maintains a constant process mode
[23]
(pressure, temperature, flow, etc.) and adjusts the motor
[24]
speed on the basis of the reference/setpoint and feedback
[25]
signal.
[26]
A transmitter provides the PID regulator with a feedback
signal from the process as an expression of the process's
[27]
actual mode. The feedback signal varies as the process
[28]
load varies.
[29]
This means that there is a variance between the reference/
[30]
setpoint and the actual process mode. This variance is
[31]
compensated by the PID regulator by means of the output
frequency being regulated up or down in relation to the
[32]
variance between the reference/setpoint and the feedback
[33]
signal.
[34]
[35]
The integrated PID regulator in the frequency converter
[36]
has been optimised for use in process applications. This
[37]
means that there are a number of special functions
[38]
available in the frequency converter.
Previously it was necessary to obtain a System to handle
[39]
these special functions by installing extra I/O modules and
[40]
programming the System. With the frequency converter
the need to install extra modules can be avoided. The
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