13-17-613 Page 49
5.4.2.2.4 Elevation
Accessibility
Maintenance
Distributor
Factory
The next item in the
VFD
menu is
Elevation
.
Elevation
should be set equal to the elevation
above sea level at the compressor site. This parameter is used to de-rate the compressor drive
system at higher elevations where heat dissipation is less effective. There is no de-rating
performed at elevations below 3300 feet (1000 m).
5.4.2.2.5 Min Volt Factor
Accessibility
Maintenance
Distributor
Factory
The next item in the
VFD
menu is the
Min Volt Factor
. The
Voltage Factor
is a calculation of the
DC bus voltage relative to the rated system voltage. If the drive is overloaded or the line voltage is
below the threshold the voltage factor will fall below the minimum volt factor setting. This will
engage the voltage factor limiter to reduce system load. This should be set to the default value of
87%.
5.4.2.2.6 Lag Pressure
Accessibility
Maintenance
Distributor
Factory
The next item in the
VFD
menu is the
Lag Pressure
. The
Lag Pressure
is the maximum
interstage pressure at which the first stage motor will be allowed to start in a two-stage
compressor.
5.4.2.2.7 Lag Start Time
Accessibility
Maintenance
Distributor
Factory
The next item in the
VFD
menu is the
Lag Start Time
. The
Lag Start Time
is the minimum time
that the second stage motor will be run before starting the first stage motor in a two-stage
compressor.
5.4.2.2.8 Pressure Bands
Accessibility
Maintenance
Distributor
Factory
The next item in the
VFD
menu is
Pressure Bands
. The
Pressure Bands
submenu allows the
user to set the pressures P1
– P5 on the VFD. These pressures settings are then used to define
the min and max speeds of VFD 1 and VFD 2.
Содержание AIRSMART
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