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P/N 985555
Operation & Maintenance Recommendations
for Low Voltage General Purpose
V entilated & Encapsulated transformers
CAUTION
Installation and
maintenance
should be
performed only by
qualified personnel.
De-energize the
transformer before
performing any
maintenance or
service work.
CAUTION
Never lift from or
apply force to coils,
terminals or
terminal boards.
CAUTION
Always
permanently and
adequately ground
the transformer
case.
CAUTION
Never make
connections while
the transformer
is energized.
Ventilated
Receiving:
Inspect for external damage during shipment.
Remove covers and panels to inspect for any
damage to internal parts.
Handling:
Ventilated enclosures are designed to be fork or sling
lifted, with enclosure panels in place. Lifting ears are
provided on larger encapsulated units.
Installation and Ventilation:
Select a location complying with all local and national
safety codes, that will not interfere with the normal
movement of people, trucks, equipment and material.
A dent in the enclosure may reduce the insulation
clearances to an unsafe level. Remove shipping bolts
and braces when provided. Ventilated units require
minimum 6” clearance on sides and top. Mount
encapsulated units only on vertical surfaces.
Ventilated Unit Grounding:
Grounding is necessary for safety. Make certain the
grounding jumper between the core/coil assembly
and case is intact, or that the core/coil assembly is
directly grounded from the core clamp through the
flexible lead. Ensure the grounding or bonding meets
the N.E.C. and local codes.
Connections:
Conduit should enter through the conduit access
area only. Refer to the wiring diagram for correct line
and tap connections. Before changing taps on
ventilated units, scrape protective varnish from tap
terminals to expose bare metal. Replace hardware in
the same order it was removed with flat and spring
washers. Make sure all connections are tight.
Encapsulated
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The Total Power
Quality Experts
www.sola-hevi-duty.com
Phone: (800) 377-4384
FAX: (800) 367-4384
CAUTION
Always
de-energize
transformer
before any
inspection or
cleaning.
CAUTION
De-energize
transformer before
removing from
service.
Sound Levels:
Avoid hallways or a corner near the ceiling or floor.
Mount transformers on a floor, wall or structure with
as great a mass as possible. To minimize
sound levels:
A. Use flexible connectors for connections to the
primary and secondary terminals.
B. Tighten all panels to prevent vibration.
Maintenance for Ventilated Units:
Periodic Inspection: For clean, dry locations, annual
inspections should suffice. Where the air is contaminated with dust or chemical fumes, monthly inspections may be required. After the first few inspections,
set up a schedule based on existing conditions. With
the transformer de-energized:
A. Remove enclosure panels.
B. Inspect for loose connections, rust, corrosion
and the general condition of the transformer
C. Look for signs of overheating or of voltage
creepage over insulating surfaces (indicated by
tracking or carbonization).
Cleaning:With a vacuum cleaner, blower, or low
pressure compressed air, clean accumulations of dirt
found on the windings or insulators. Carefully clean
both ends of the winding assemblies and
ventilating ducts.
Removing from Service:
If a ventilated unit must be moved, replace the core
and coil transit bolts plus any shipping braces.
Storage:
Protect the transformer from dust and moisture at
all times.
Accessory Installation:
Wall Mounting Brackets are available for ventilated
transformers, 15 - 75 KVA.
Weather Shields are available for ventilated designs
rated 15 - 500 KVA, making the unit UL-3R listed for
outdoor applications. Encapsulated units are UL-3R
listed without weather shields.
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