4
Instruction Booklet
IB156002EN
Effective January 2022
Eaton HCU2/HCUn active harmonic
filter installation manual
EATON
www.eaton.com
Safety precautions
Installation, wiring, testing, and service must be performed in
accordance with all local and national electrical codes.
WARNING
LOCKOUT/TAGOUT ALL ELECTRICAL SOURCE CIRCUITS FEEDING THE
UNIT(S) IN THE OPEN POSITION BEFORE BEGINNING WIRING OR
TERMINATIONS. FAILURE TO FOLLOW THE INSTRUCTIONS COULD
RESULT IN SEVERE BODILY INJURY OR DEATH. ONLY QUALIFIED
PERSONNEL FAMILIAR WITH THE OPERATION AND CONSTRUCTION OF
THIS EQUIPMENT SHOULD INSTALL, ADJUST, MODIFY, AND SERVICE
THIS EQUIPMENT.
WARNING
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH.
• APPLY APPROPRIATE PERSONAL PROTECTIVE EQUIPMENT (PPE) AND
FOLLOW SAFE ELECTRICAL WORK PRACTICES. SEE NFPA 70E IN THE
USA, CSA
®
Z462, OR APPLICABLE LOCAL STANDARDS
• THIS EQUIPMENT MUST BE INSTALLED AND SERVICED ONLY BY
QUALIFIED ELECTRICAL PERSONNEL
• DO NOT EXCEED THE DEVICE’S RATINGS FOR MAXIMUM LIMITS
• GROUND EQUIPMENT USING THE GROUND CONNECTING POINT
PROVIDED BEFORE TURNING ON ANY POWER SUPPLYING
THIS DEVICE
• TURN OFF ALL POWER SUPPLYING THIS DEVICE AND THE
EQUIPMENT IN WHICH IT IS INSTALLED BEFORE WORKING
ON THE DEVICE OR EQUIPMENT
• AFTER REMOVING POWER, WAIT FOR 15 MINUTES TO ALLOW THE
CAPACITORS TO DISCHARGE PRIOR TO OPENING THE DOORS OR
REMOVING COVERS
• ALWAYS USE A PROPERLY RATED VOLTAGE SENSING DEVICE TO
CONFIRM POWER IS OFF
• REPLACE ALL DEVICES, DOORS, AND COVERS BEFORE TURNING ON
POWER TO THIS EQUIPMENT
• CAREFULLY INSPECT THE INTERIOR FOR TOOLS LEFT BEHIND BEFORE
CLOSING AND SEALING THE DOOR FAILURE TO FOLLOW THESE
INSTRUCTIONS WILL RESULT IN DEATH OR SERIOUS INJURY
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN DEATH OR
SERIOUS INJURY.
WARNING
POTENTIAL COMPROMISE OF SYSTEM AVAILABILITY, INTEGRITY,
AND CONFIDENTIALITY
• CHANGE DEFAULT PASSWORDS AT FIRST USE TO HELP PREVENT
UNAUTHORIZED ACCESS TO DEVICE SETTINGS AND INFORMATION
• DISABLE UNUSED PORTS/SERVICES AND DEFAULT ACCOUNTS,
WHERE POSSIBLE, TO MINIMIZE PATHWAYS FOR MALICIOUS
ATTACKS
• PLACE NETWORKED DEVICES BEHIND MULTIPLE LAYERS OF CYBER
DEFENSES (SUCH AS FIREWALLS, NETWORK SEGMENTATION, AND
NETWORK INTRUSION DETECTION AND PROTECTION)
• USE CYBER SECURITY BEST PRACTICES (FOR EXAMPLE,
LEAST PRIVILEGE, SEPARATION OF DUTIES) TO HELP PREVENT
UNAUTHORIZED EXPOSURE, LOSS, MODIFICATION OF DATA AND
LOGS, INTERRUPTION OF SERVICES, OR UNINTENDED OPERATION
• RESTRICT UNIT ACCESS TO AUTHORIZED PERSONNEL ONLY
Introduction
The product can be provided in either of two types, an Harmonic
Correction Unit (HCU2) or Neutral Harmonic Correction Unit (HCUn).
Both types are to be installed as described in this manual. These
products are both referred to as an active filter in this manual.
Harmonic correction unit
Harmonic Correction Units (HCU2) are static power electronic
products that employ digital logic and IGBT semiconductors to
synthesize a current waveform that is injected into the electrical
network to cancel harmonic currents caused by nonlinear loads.
HCU2 employ current transformers to measure the load current to
determine the content of harmonic current present. By injecting
the synthesized current, network harmonic currents are greatly
mitigated, thus reducing the heating effects of harmonic current
and reducing voltage distortion.
HCU2 also have the ability to correct for poor displacement power
factor (DPF) and for mains current balancing. DPF correction can
be provided for either leading (capacitive) or lagging (inductive)
loads that cause poor DPF. Mains current balancing is achieved by
measuring the negative sequence current present and injecting the
inverse negative sequence current to balance the current for the
upstream network.
Multiple enclosure styles are available. Chassis mount open chassis
designs can be installed in other types of enclosures such as motor
control centers (MCC).
Neutral harmonic correction unit
Neutral Harmonic Correction Units (HCUn) are static power
electronic products that employ digital logic and IGBT
semiconductors to synthesize a current waveform that is injected
into the electrical network to cancel harmonic currents caused by
nonlinear loads. HCUn employ current transformers (CT) to measure
the load current to determine the content of harmonic current
present. By injecting the synthesized current, network harmonic
currents are greatly mitigated, thus reducing the heating effects of
harmonic current and reducing voltage distortion.
HCUn also have the ability to correct for poor displacement power
factor (DPF) and for mains current balancing. DPF correction can
be provided for either leading (capacitive) or lagging (inductive)
loads that cause poor DPF. Mains current balancing is achieved by
measuring the negative sequence current present and injecting the
inverse negative sequence current to balance the current for the
upstream network.
NEMA
T
1 and IP00 enclosure styles are available. Chassis mount
open chassis designs can be installed in other types of enclosures
such as motor control centers (MCC).
Eaton’s HCUn can be powered by three-phase conductors to provide
corrective current for Line-to-Line connected loads or by three-phase
conductors and neutral to provide correction for Line-to-Line and
Line-to-Neutral connected loads. The amount of correction can be
selected to provide neutral current for up to three times the phase
current correction. The neutral wiring must be sized appropriately
based on the selected neutral current correction.
