SECTION 7 WSPC USER INTERFACE MANUAL
65
VSD PACKAGE SETTINGS
When a VSD compressor is connected to the WSPC,
additional VSD related adjustments are available on
the Admin display. See Figure 7-13. These values,
located in the right side of the screen are only
displayed when a VSD machine is connected. In
most cases, the factory settings are satisfactory for
normal compressor operation.
Should modification of the parameters be necessary,
adjust the VSD Package Settings in the same
manner as described in Assigning Digital Inputs on
page 62. VSD Package Settings
The VSD Package Settings are described below (ref.
Figure 7-14):
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 range of
operation. Enter the desired frequency multiplied by
10 (e.g., 814 for 81.4 Hz).
Motor Protect Amps—Maximum amp setting for
VSD operation. This should be set for the LOWER of:
1. Maximum motor amps. This is FLA times
service factor, unless a specific SFA is
shown. For 460V/60Hz motors connected
400V/60Hz, multiply the 460V nameplate rat-
ings by 1.15.
2. Rated drive current. This is shown on the
drive nameplate. This will usually be the limit
for most 460V compressors.
Slow Acc/Dec—Setting for controlling VSD
acceleration and deceleration. The factory settings
are based on standard motors, and this setting is 0. If
a special motor is applied, this setting may be
increased to eliminate drive overvoltage during
deceleration. Slower settings will reduce system
stability, and may require additional air storage.
Figure 7-14: VSD Package Settings
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