50 ● gForce Ultra User Manual 10-2014
7.5 VFD Drive
There are tremendous energy saving and application advantages available by applying
a VFD drive to compressor cooling. Variable speed control offers the ability to match
the cooling capacity to the actual need. Costs are reduced through direct energy
savings of operating at a lower speed. The drive can operate a variable capacity
compressor over a wider range. Other advantages of the VFD are limiting the number
starts and reduced start system shock thus reducing peak energy demand and system
wear. Below is a figure showing the VFD control display and some general instructions
required to charge the unit and monitor any alarms.
The local control panel (LCP) for the VFD drive is the combined display and keypad on
the front of the unit. The LCP has several user functions:
Start, stop, and control speed when in local control mode
Display operational data, status, warnings and cautions
Programming frequency converter functions
Manually reset the frequency converter after a fault when auto-reset is inactive
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