TCI HGP - Manual (Page 20)

F I T L E R A N D F U S E M O N I T O R O P E R A T I O N
Filter and Fuse Monitor Operation HGP IOM Manual 20
Filter and Fuse Monitor Operation
HGP Filter Overview
The Harmonic Guard Passive (HGP) Filter provides a low impedance path for the major harmonic
currents demanded by Variable Frequency Drives (VFDs). This greatly reduces the amount of
harmonic currents flowing through the electrical power distribution system, bringing those harmonic
currents in line with the IEEE-519 standard for harmonic distortion mandated by an increasing number
of utilities.
The HGP Filter includes branch fuses on the harmonic trap circuit capacitors. These fuses are included
in the design to prevent damage to the capacitors in the event of excessive harmonic trap current if the
filter is misapplied.
HGP Fuse Monitor Overview
The HGP Fuse Monitor Option is used in conjunction with the HGP filter to monitor the status of the
HGP branch circuit capacitor fuses and optional contactor. If a blown fuse condition is detected the
HGP Fuse Monitor Option will energize a SPDT relay contact. Additionally, the Fuse Monitor Option
is used to indicate the state of the optional contactor that allows users to remove the capacitors from
the circuit, eliminating the possibility of leading power factor. Finally, the Fuse Monitor Option
provides the additional benefit of detecting drive input voltage phase reversal and loss of phase.
The HGP Fuse Monitor can be connected to a programmable digital input available on most modern
VFDs and/or Programmable Logic Controllers (PLCs). Once the status of the HGP Fuse Monitor is
routed to a programmable digital input the status of the Fuse Monitor can be relayed on the VFDs or
PLCs integrated communications field bus or Industrial Ethernet network interface.
Figure 2 – HGP Filter and Fuse Monitor Option Block Diagram