Hammond Power Solutions Mini Power Center Installation Guide
INSTALLATION, OPERATION AND MAINTENANCE GUIDE
FOR INDOOR/OUTDOOR SINGLE PHASE
FOR INDOOR/OUTDOOR SINGLE PHASE
Mini Power Center
Mini Power Center
Indoor/Outdoor
Mini Power Center
(with Encapsulated Transformer)
Single Phase
Up To 25 kVA
*Note: This guide is Trilingual
(English, French, Spanish)*
Literature No.: IOMGPC1PH
Issue Date: September 2011
Safety Precautions
(1) Do not lift or move a Mini Power Center without proper equipment and
experienced personnel.
(2) Do not install the Mini Power Center until a full inspection has been
completed.
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are recommended.
(4) Connections should only be in accordance with the nameplate diagram
or connection drawings.
(5) Make sure all power is disconnected before attempting any work on the
Mini Power Center.
(6) Make certain all ground connections are complete and tightened before
energizing the Mini Power Center.
(7) Do not attempt to change any taps - primary or secondary, while the
Mini Power Center is energized.
(8) Do not change connections when the Mini Power Center is energized.
(9) Do not adjust or remove any accessories or cover plates while the
Mini Power Center is energized.
CONTENTS
General Information 3
Handling 3
Receiving & Inspection 3
Storage 3
Installation 3
Ventilation 4
Accessibility 4
Sound Levels 4
Cable Connections 4
Grounding 4
Inspection Before Energization 5
Operation 5
Maintenance 5
Dimensions 6
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INSTALLATION, OPERATION AND MAINTENANCE
OF MINI POWER CENTERS
GENERAL
Mini Power Centers are manufactured to provide
optimum performance for a lifetime of uninterrupted
service. Careful attention to the following instructions
is recommended for safe and reliable operation.
Installation, operation and maintenance of Mini
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persons, familiar with electrical apparatus and the
potential hazards involved.
Warning: Danger! There is the potential of electric
shock whenever working in or around electrical
equipment such as transformers. Power must be
shut off before any work is conducted on a Mini
Power Center.
As with any electrical device, Mini Power Centers
must be installed according to the requirements
of the national, and local electrical codes. Refer
to ANSI/IEEE C57-94 may also be referred to for
recommended installation, application, operation and
maintenance of dry-type transformers.
STORAGE
Mini Power Centers that will not be immediately
installed and energized, should be stored in a clean
dry environment away from any environmental
airborne contaminants.
It is recommended that Mini Power Centers be
stored in a heated building, in the original shipping
packaging.
INSTALLATION
All Mini Power Centers are supplied with a Type
3R enclosure. Type 3R units may be installed indoor,
or outdoor where applicable.
For any outdoor location, the appropriate
applicable codes must be followed including cable
installation and hardware suitable for outdoor service.
Water tight couplings must be used at the knockouts.
Mini Power Centers must be located in an upright
position on walls, posts, beams or other locations
capable of supporting their weight.
HANDLING
Mini Power Centers are shipped palletized. The
units on pallets can either be lifted via a forklift truck or
hoisted by the lifting lugs provided.
Appropriate lifting equipment should be used
relative to the size of each Mini Power Center. No
attempt should be made to lift or move a Mini Power
Center from any points on the unit other than those
indicated.
Please Note: Remove the shipping bolts located
at the top mounting holes as well as the one(s) located
at the bottom before removing it from the pallet.
RECEIVING INSPECTION
Immediately after receiving the Mini Power
Center, it should be inspected for any transit damage
and for correctness against the shipping documents.
The unit should be examined for any breaks in its
packaging, dented or damaged enclosures or missing
parts from the packing list.
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immediately with the carrier and a second copy of
all pertinent information relative to the order and the
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Mounting Instructions (refer to page 6)
1. Select an installation location that is on a noncombustible surface.
2. The mounting location must allow for air
circulation around the transformer for cooling
purposes. Please refer to the minimum
distances stated in the ventilation section.
3. Using measurement from the table provided,
drill the top two mounting holes on the mounting
surface.
4. Lift the Mini Power Center into position and
install the top two mounting bolts.
5. With the Mini Power Center hanging on the top
two mounting bolts, level the unit, then mark and
drill the lower mounting hole(s) into the mounting
surface.
6. To provide Type 3R protection (protection from
falling rain), the Mini Power Center must be
mounted vertically with the control panel at the
bottom.
7. Install the lower mounting bolts into the lower
mounting holes.
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VENTILATION
CABLE CONNECTIONS
Mini Power Centers are required to be installed
in an area where they can be cooled by means of
the free circulation of air where the average ambient
temperature is 30°C (86°F) and should not exceed
40°C (104°F) at any time.
Adequate ventilation is essential for Mini Power
Centers to meet their nameplate kVA capability. All
Mini Power Centers should be located at least 20 cm
(8 in) away from wall or any other obstructions and 25
cm (10 in) from roofs to allow free, clean circulation of
air.
ACCESSIBILITY
NEC standards require that Mini Power
Centers be accessible for inspection and located
accordingly. However, transformers should not be
located in areas where stored items are likely to
interfere with either natural air convection or the
capability to have them inspected. Passage ways or
other areas where people could be exposed to live
parts during inspection should also be avoided.
Adequate protection should be provided under
any circumstances.
1. Open the wiring compartment by loosening the
cover screw.
2. Terminals should be cleaned and electrical
joint compounds are recommended for use on
all electrical connections.
3. Make the appropriate electrical connection to
suit the desired voltages as per the connection
diagram on the nameplate. This includes the
input connections, and the ground(s).
4. Make certain to insulate any unused wire leads
with marrette connectors and electrical tape.
5. Close the wiring compartment and ensure that
the cover screw is tightly secured.
MINI POWER CENTER
SOUND LEVELS
Mini Power Centers are an electrically energized
apparatus and by their nature emit sound due to their
component materials.
Mini Power Centers are required to meet NEMA
standards for the maximum sound levels permissible.
These sound level standards vary from 40 to 50 DB
and hence, can be an annoyance if located in close
proximity to where people work or reside.
Care should therefore be exercised in selecting
sites for Mini Power Centers particularly to avoid
sensitive areas like hospitals, classrooms, medical or
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The following guidelines may be helpful;
!Units should be mounted away from corners or
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considered to make connections.
!Acoustically absorbing materials could be
considered for walls and ceilings around the unit.
!The location of the unit should be located as far
as practical from areas where sound levels could
be considered undesirable.
The connecting cable size is determined from the
line current rating of the Mini Power Center's primary
and secondary loads. Convenient pre-punched
knockouts are provided on all Mini Power Center
enclosures, to facilitate cable entry. (NOTE: Mini Power
Center cannot be returned if the knockouts have been removed
unless the unit has a manufacturing defect as outlined in the
standard warranty policy.)
GROUNDING
All core and coil assemblies are solidly grounded
to the enclosure internally to ensure that all conductive
metal parts have the same potential.
The Mini Power Center enclosure in turn should
also be securely and effectively grounded as a safety
precaution. This grounding should be in accordance
with national electrical code standards.
- 4 -
INSPECTION BEFORE ENERGIZATION
For the safe and proper operation of the Mini
Power Center, we recommend that the following items
be checked for completeness:
a) The insulation resistance, enclosure to primary,
enclosure to secondary and primary to
secondary, should be greater than 10k ohms.
b) Before energizing and connecting any loads,
please measure and verify the output voltage
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c) Ensure correct phase connections. Refer to the
nameplate vector diagram.
d) The enclosure should be grounded with the
appropriately sized conductor.
e) The clearance and tightness of all electrical
connections should be checked.
f) For single phase 3-wire 120/240 volt loads, care
must be taken to ensure the neutral current does
not exceed 1/2 of the Mini Power Center kVA
rating.
OPERATION
For all relatively normal and clean installations,
Mini Power Centers will operate satisfactorily under
normal conditions of energization and load.
For your reference, fully loaded Mini Power
Centers may be very warm to the touch, particularly on
the top of the unit.
Standards permit the temperatures of the
enclosure to be 65°C over ambient. This represents
normal loading and should not be of concern.
Mini Power Centers are designed to operate
continuously at their full nameplate kVA rating.
ANSI C57.96 provides guidance for loading
transformers under different conditions including:
If the Mini Power Center is experiencing increased
temperatures, the following load characteristics
should be considered immediately:
!Rigorous motor starting loads or other impact
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that application is required.
!Over-excitation of unit due to excess supply line
voltage or current.
!Ambient temperatures above standard.
!Overload beyond ANSI C57.96 guidelines.
!Harmonic distortions of the supply line voltage
and currents.
MAINTENANCE
Under normal operating conditions and
environments, Mini Power Centers do not require
maintenance. However, periodic care and inspection
is a good practice, particularly if the unit is exposed to
extreme environmental conditions.
Peripheral inspection and external dust and
dirt removal may be carried out while the Mini Power
Center is in operation. However, access covers must
not be opened under energized conditions.
The accumulation of ice or snow will not
adversely affect the operation of Mini Power Centers.
However, the accumulation of dust or dirt will affect the
cooling of the Mini Power Center and may become a
potential fire hazard.
Internal maintenance must be performed with a
Mini Power Center de-energized, isolated and with
the terminals grounded.
The ground connection should be checked to
ensure a low impedance connection.
!Ambient temperatures that are varied from the
ambient temperatures required for transformer
operation.
!Short time overload as it relates to time and
temperature and the corresponding loss of life of
the transformer.
!Overload that results in a reduction of life
expectancy of the transformer.
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A
B C
A
front
kVA
Dimensions
(inches)
A B C
5 6.000 30.313 31.938
7.5 8.000 30.313 31.938
10 8.000 32.563 34.188
15 8.000 32.563 34.188
25 9.000 39.938 41.563
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