Danfoss VLT AQUA Drive Operating Instructions Manual page 87

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