20-12 Reference/Feedback Unit
Option: Function:
[21] l/min
[22] l/h
[23] m³/s
[24] m³/min
[25] m³/h
[30] kg/s
[31] kg/min
[32] kg/h
[33] t/min
[34] t/h
[40] m/s
[41] m/min
[45] m
[60] °C
[70] mbar
[71] bar
[72] Pa
[73] kPa
[74] m WG
[75] mm Hg
[80] kW
[120] GPM
[121] gal/s
[122] gal/min
[123] gal/h
[124] CFM
[125] ft³/s
[126] ft³/min
[127] ft³/h
[130] lb/s
[131] lb/min
[132] lb/h
[140] ft/s
[141] ft/min
[145] ft
[160] °F
[170] psi
[171] lb/in²
[172] in WG
[173] ft WG
[174] in Hg
[180] HP This parameter determines the unit that is used
for the setpoint reference and feedback that the
PID Controller will use for controlling the output
frequency of the frequency converter.
20-21 Setpoint 1
Range: Function:
0
ProcessCtrlUnit*
[-999999.999 -
999999.999
ProcessCtrlUnit]
Setpoint 1 is used in Closed
Loop Mode to enter a
setpoint reference that is
used by the frequency
20-21 Setpoint 1
Range: Function:
converter’s PID Controller.
See the description of
20-20 Feedback Function.
NOTICE
The setpoint reference
entered here is added
to any other references
that are enabled (see
parameter group 3-1*
References).
20-81 PID Normal/ Inverse Control
Option: Function:
[0] Normal The frequency converter’s output frequency
decreases when the feedback is greater than the
setpoint reference. This is common for pressure-
controlled supply fan and pump applications.
[1] Inverse The frequency converter’s output frequency
increases when the feedback is greater than the
setpoint reference.
20-82 PID Start Speed [RPM]
Range: Function:
Size
related*
[ 0 -
par. 4-13
RPM]
When the frequency converter is first
started, it initially ramps up to this output
speed in Open Loop Mode, following the
active Ramp Up Time. When the output
speed programmed is reached, the
frequency converter automatically switches
to Closed Loop Mode and the PID
Controller begins to function. This is useful
in applications in which the driven load
must first quickly accelerate to a minimum
speed when it is started.
NOTICE
This parameter is only visible if
0-02 Motor Speed Unit is set to [0]
RPM.
20-93 PID Proportional Gain
Range: Function:
2 * [0 - 10 ] The proportional gain indicates the number of
times the error between the set point and the
feedback signal is to be applied.
If (Error x Gain) jumps with a value equal to what is set in
20-14 Maximum Reference/Feedb. the PID controller tries to
change the output speed equal to what is set in
parameter 4-13 Motor Speed High Limit [RPM]/4-14 Motor
How to programme the freque...
VLT AQUA Drive FC 202 Operation Instructions
102 MG20P402 - Rev. 2013-12-16
55
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