Danfoss VLT Aqua Drive FC 202 Operating Instructions Manual page 80

7. How to programme the frequency converter
20-21 Setpoint 1
Range:
0.000
20-81 PID Normal/Inverse Control
Option:
[0]
[1]
7
20-82 PID Start Speed [RPM]
Range:
*
0
20-93 PID Proportional Gain
Range:
0.50
80
* [Ref par.3-02 -
MIN
Ref par. 3-03 UNIT
MAX
(from par. 20-12)]
* Normal
Inverse
[0 - 6000 RPM]
* [0.00 = Off - 10.00]
MG.20.M2.02 - VLT
Function:
Setpoint 1 is used in Closed Loop Mode to enter a setpoint ref-
erence that is used by the frequency converter's PID Controller.
See the description of Feedback Function
NB!
Setpoint reference entered here is added to any
other references that are enabled (see par. group
3-1*).
Function:
Normal [0] causes the frequency converter's output frequency
to decrease when the feedback is greater than the setpoint ref-
erence. This is common for pressure-controlled supply fan and
pump applications.
Inverse
[1] causes the frequency converter's output frequency
to increase when the feedback is greater than the setpoint ref-
erence.
Function:
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 here is
reached, the frequency converter will automatically switch to
Closed Loop Mode and the PID Controller will begin to function.
This is useful in applications in which the driven load must first
quickly accelerate to a minimum speed when it is started.
NB!
This parameter will only be visible if par. 0-02 is
set to [0], RPM.
Function:
This parameter adjusts the output of the frequency converter's
PID Controller based on the error between the feedback and the
setpoint reference. Quick PID Controller response is obtained
when this value is large. However, if too large a value is used,
the frequency converter's output frequency may become un-
stable.
®
is a registered Danfoss trademark
®
VLT AQUA Drive
Operating Instructions
, par. 20-20.