Danfoss VLT AQUA Drive FC 200 Instruction Manual page 95

VLT AQUA High Power Instruction Manual
20-81 PID Normal/Inverse Control
Option:
*
[0]
[1]
20-82 PID Start Speed [RPM]
Range:
*
0
20-93 PID Proportional Gain
Range:
*
0.50
20-94 PID Integral Time
Range:
20.00 s
Function:
Normal
Normal
Inverse
quency to decrease when the feedback is greater than the
setpoint reference. This is common for pressure-controlled sup-
ply fan and pump applications.
Inverse
quency to increase when the feedback is greater than the
setpoint reference.
Function:
[0 - 6,000 RPM] When the adjustable frequency drive 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 adjustable frequency drive 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.
Function:
[0.00 = Off - 10.00] This parameter adjusts the output of the adjustable frequency
drive's PID controller based on the error between the feedback
and the setpoint reference. The quick PID controller response is
obtained when this value is large. However, if a value that is too
large is used, the adjustable frequency drive's output frequency
may become unstable.
Function:
* [0.01 - 10,000.00 = Over time, the integrator adds (integrates) the error between
Off s] the feedback and the setpoint reference. This is required to en-
sure that the error approaches zero. Quick adjustable frequency
drive speed adjustment is obtained when this value is small.
®
MG.20.P1.22 - VLT is a registered Danfoss trademark.
4. How to program the adjustable frequency
[0] causes the adjustable frequency drive's output fre-
[1] causes the adjustable frequency drive's output fre-
NOTE
This parameter will only be visible if par. 0-02 is
set to [0], RPM.
drive
4
95