Phase Technologies - Model APX Series - Low Harmonics Phase Converting Variable Frequency Drive
IEEE 519 is an industry standard that sets allowable limits of harmonic voltage and current on utility systems. As the use of variable frequency drives (CFD) has increased, the negative impact of the harmonics they generate has resulte din more electric utilties enforcing compliance with IEEE 519. Harmonic distortion is generated by non-linear loads such as power switching devices. This harmonic distortion creates problems for the utility and other customers on the electrical distribution system. Problems can include overheating of the distribution transofmer, failure of senstive equipment and a general degradation of power quality. A variety of harmonic mitigation solutions are available for three-phase poewr systems. However, when standard VFDs are used as phase converters, the harmonics on the single-phase line are more difficult to control due to the prevalence of the third harmonic. Single-phase harmonic filters are expensive and marginally effective.
Keypad Display
The advanced, easy-to-use programmable features are controlled through an intuitive interface with a backlit 32 character LCD text display and a keypad that has the familiar look and feel of an HOA pump control.
Constant Pressure
The APX can provide smooth, steady control of pressure in response to fluctuating demand for water through the use of digital pressure sensor switches.
Type 3R Outdoor Enclosure
APX drives are readily available in an affordable factory outdoor enclosure.
No Oversizing Required
Standard VFDs need to be doubled, even tripled in size when used as phase converters to ensure that the input diode bridge and capacitor on the DC buss can handle the single-phase current. APX Series drives are purpose-built for phase conversion so there is no need to oversize.
