WSPC USER INTERFACE Part 2: Administrator Level
70
The VSD Package Settings are described below (ref. Figure 6.14):
Figure 6.14 VSD Package Settings
Flow calibration - The flow indicator sets the nominal (100%) flow value for the
machine operating under typical conditions. This value may be adjusted as
needed for specific applications and operating conditions.
Power calibration - The power indicator sets the nominal (100%) power value
for the machine operating under typical conditions. This value may be adjusted
as needed for specific applications and operating conditions.
Gain control I and Gain control P - A value of 10 is recommended for each of
these controls for almost all end-use applications. Additional stability functions
are built into the controls that make these values non-critical and virtually
eliminate the need for tuning. However, extremely large- or small-volume
systems may benefit from some adjustment. Consult the factory if stability
problems are encountered.
Autoset % - Allows speed adjustments to be made automatically when changes
in the Setpoint pressure are made causing the compressor to operate at its full
rated power capability. This should normally be set to 100. If it is desired to run
the compressor at less than full capacity, simply set this to a lower value. For
example, set the Autoset % to 80 to operate a 50HP compressor at 40HP
maximum. The WS Controller will calculate the necessary speed adjustments
whenever the setpoint is changed. Autoset may be disabled by setting this value
to 0 % allowing the speed to be adjusted manually. However, this is not
recommended and can cause improper machine operation.
Minimum Speed - is normally left at the factory setting, but may be increased.
Enter the desired frequency multiplied by 10 (e.g., 250 for 25.0 Hz).
Maximum Speed - If Autoset is enabled, the maximum speed will be set
automatically as appropriate for the machine and setpoint pressure. If Autoset is
disabled, the frequency will be required to be entered manually to control the
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