20-21 Setpoint 1
Range: Function:
0.000
*
[Ref
MIN
par.3-02 - Ref
MAX
par. 3-03 UNIT (from par. 20-12)]
Setpoint 1 is used in Closed Loop Mode to enter a setpoint reference that is used by the frequency converter’s
PID Controller. See the description of
Feedback Function
, par. 20-20.
NB!
Setpoint reference entered here is added to any other references that are enabled (see par.
group 3-1*).
20-81 PID Normal/Inverse Control
Option: Function:
[0]
*
Normal
[1] Inverse
Normal
[0] causes the frequency converter’s output frequency to decrease when the feedback is greater than
the setpoint reference. 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 reference.
20-82 PID Start Speed [RPM]
Range: Function:
0
*
[0 - 6000 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 here is reached, the frequency con-
verter 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.
20-93 PID Proportional Gain
Range: Function:
0.50
*
[0.00 = Off - 10.00]
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 unstable.
20-94 PID Integral Time
Range: Function:
20.00 s
*
[0.01 - 10000.00 = Off s]
The integrator adds over time (integrates) the error between the feedback and the setpoint reference. This is
required to ensure that the error approaches zero. Quick frequency converter speed adjustment is obtained when
this value is small. However, if too small of a value is used, the frequency converter’s output frequency may
become unstable.
8.2.10. 22-** Miscellaneous
This group contains parameters used for monitoring water/ wastewater applications.
22-20 Low Power Auto Set-up
Option: Function:
When set for
Enabled
, an auto set up sequence is activated, automatically setting speed to approx. 50 and 85%
of rated motor speed (par. 4-13/14,
Motor Speed High Limit
). At those two speeds, the power consumption is
automatically measured and stored.
Before enabling Auto Set Up:
VLT
®
AQUA Drive
Operating Instructions
8. How to programme the frequency converter
MG.20.M4.02 - VLT
®
is a registered Danfoss trademark
87
8
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