L IBERTY W ELDCELL F EATURES
S OFT S TART ( OPTIONAL )
The Variable Frequency Drive (VFD) allows the motor ramp up to speed rather than across the line
starting contactors. This eliminates starting amperage spikes as well as inertial effects of the blower.
In non-VFD systems, these spikes can be as high as eight times the full load amps.
P RESSURE T RACKING ( OPTIONAL )
The Variable Frequency Drive (VFD) inside the control panel allows the Liberty Weldcell to track the
usage of the filters. This allows the unit to automatically increase the speed of the motor to
compensate for the additional air restrictions caused from dirty filters. This feature is an automatic
feature and cannot be disabled.
This feature alone can save 55% of the energy costs over the life of the filters.
E CONOMIZER TM
The economizer is a standard feature on the Liberty Weldcell. When the unit is in automatic mode,
the economizer will start the unit automatically when the user begins welding. When the user has
stopped welding, the unit will shut the unit down automatically. Fifteen minutes after the end of the
welding arc, unit will go into Sleep mode. If the user begins welding within that fifteen minutes time
frame, the timer will be reset and recommence when the welding ends again.
S LEEP F UNCTION ( OPTIONAL )
The sleep function can be set as described in the Option Mode. The sleep function is set to last 5 minutes by default. When the fifteen minutes Economizer TM timer ends, sleep mode is activated.
During this time, the VFD ramps down the speed of the motor to about 20% of the maximum speed.
During this time, the drive uses only 2% of the energy, but is able to maintain the blower speed and
eliminates much of the power required at the unit start up
R EDUCED M AINTENANCE ( OPTIONAL )
The Liberty Weldcell uses the Variable Frequency Drive (VFD) to manage the motor's operating
speed. This in turn controls the airflow inside the unit and allows for more efficient operation through
the Pressure Tracking feature. This reduces the impaction of dust upon the filters inside the unit and
Copyright © Clean Air Industries , Inc.
Liberty WeldCell User Manual, August 2023
Page 37 of 66
Made with FlippingBook - PDF hosting