TCi HarmonicGuard Series, Инструкция по установке, эксплуатации и обслуживанию

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HGL IOM Manual - Rev. B 21
HarmonicGuard
®
Low Capacitance
Contactor Option (C)
Filter and Fuse Monitor Operation
HGL Filter Overview
The HarmonicGuard ® Low Capacitance (HGL) 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 HGL 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.
HGL Fuse Monitor Overview
The HGL Fuse Monitor Option is used in conjunction with the HGL filter to monitor the status of the
HGL branch circuit capacitor fuses and optional contactor. If three-phase power with correct phase
sequence is presented to sense terminals of fuse monitor, the SPDT relay contact will change state as
illustrated in Table 2. 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. The HGL Fuse Monitor Option will energize a SPDT relay contact if line power is applied
to the filter, the fuses are intact, and the optional contactor was energized and closed. Finally, the Fuse
Monitor Option provides the additional benefit of detecting drive input voltage phase reversal and loss
of phase.
The HGL 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 HGL 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. The Fuse Monitor
is available on 480V and 600V HGL filters.