Danfoss FC 100 Series Operating Instructions Manual page 88

How to Programme the Frequ...
20-71 PID Performance
Option:
[0] Normal Normal setting of this parameter will be suitable for
*
[1] Fast
20-72 PID Output Change
Range:
0.10 [0.01 -
*
0.50 ]
7 7
20-73 Minimum Feedback Level
Range:
-999999.000
ProcessCtrlU-
nit
*
20-74 Maximum Feedback Level
Range:
999999.000
ProcessCtrlU-
nit
*
20-79 PID Autotuning
Option:
[0] Disabled
*
[1] Enabled
88
Function:
pressure control in fan systems.
Fast setting would generally be used in pumping
systems, where a faster control response is desirable.
Function:
This parameter sets the magnitude of step change
during autotuning. The value is a percentage of
full speed. I.e. if maximum output frequency
inpar. 4-13 Motor Speed High Limit [RPM]/
par. 4-14 Motor Speed High Limit [Hz] is set to 50Hz,
0.10 is 10% of 50Hz, which is 5Hz. This parameter
should be set to a value resulting in feedback
changes of between 10% and 20% for best tuning
accuracy.
Function:
[Applica- The minimum allowable feedback
tion level should be entered here in User
dependant] units as defined in
par. 20-12 Reference/Feedback Unit. If
the level falls below
par. 20-73 Minimum Feedback Level,
autotuning is aborted and an error
message will appear on the LCP.
Function:
[Applica- The maximum allowable feedback
tion level should be entered here in User
dependant] units as defined in
par. 20-12 Reference/Feedback Unit. If
the level rises above
par. 20-74 Maximum Feedback Level,
autotuning is aborted and an error
message will appear on the LCP.
Function:
This parameter starts the PID autotuning sequence.
Once the autotuning has successfully completed
and the settings have been accepted or rejected by
the user, by pressing [OK] or [Cancel] buttons on
the LCP at the end of tuning, this parameter is reset
to [0] Disabled.
MG.11.AD.02 - VLT
®
VLT HVAC Drive Operating Instructions
20-81 PID Normal/ Inverse Control
Option:
[0] Normal Normal [0] causes the frequency converter's output
*
[1] Inverse Inverse [1] causes the frequency converter's output
20-82 PID Start Speed [RPM]
Range:
Applica-
tion
depend-
ent
*
20-83 PID Start Speed [Hz]
Range:
Applica-
tion
depend-
ent
*
20-93 PID Proportional Gain
Range:
0.50
*
®
is a registered Danfoss trademark
Function:
frequency to decrease when the feedback is greater
than the setpoint reference. This is common for
pressure-controlled supply fan and pump applica-
tions.
frequency to increase when the feedback is greater
than the setpoint reference. This is common for
temperature-controlled cooling applications, such as
cooling towers.
Function:
[Applica- When the frequency converter is first
tion started, it initially ramps up to this output
depend- speed in Open Loop Mode, following the
ant] 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.
NOTE
This parameter will only be visible
if par. 0-02 Motor Speed Unit is set
to [0], RPM.
Function:
[Applica- When the frequency converter is first
tion started, it initially ramps up to this output
depend- frequency in Open Loop Mode, following
ant] the active Ramp Up Time. When the
output frequency 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.
NOTE
This parameter will only be visible
if par. 0-02 Motor Speed Unit is set
to [1], Hz.
[0.00 - 10.00 ]
Function: