Superior Electric STABILINE WHR22 Series, Instructions Manual

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4
2.3. THEORY OF OPERATION
These units regulate AC voltage by automatically
adjusting POWERSTAT
®
Variable Transformers to
maintain constant output voltage.
The solid-state control unit detects the line to line
output voltage and continually compares it with output
and accuracy settings selected by the user. If the line to
line voltage is out of specifications, the control unit
drives the POWERSTAT variable transformer, by
means of a synchronous motor, to the required new
position.
3.0.
INSTALLATION
3.1. TRANSPORTING THE REGULATOR
Due to its weight and size, proper lifting procedures
must be followed when transporting the unit and
moving it into the location where it is to be installed.
The proper method for moving these units is to place a
forklift under the base. A heavy frame is provided in
this area to allow lifting the unit in this manner without
damage. The 26 inch (559 mm) wide enclosures can
also be lifted by removing the top cover and using the
lifting eyes provided in the sides of the cabinet.
3.2. MECHANICAL INSTALLATION
The voltage regulator is designed for floor mounting.
When mounting the unit, allow a minimum clearance of
4 inches (100 mm) behind the unit for proper
ventilation. All internal components and wiring
connections are accessible through the front panels. A
3 foot (1000 mm) area in front of the unit should be
kept clear for installation and service.
3.3. ELECTRICAL INSTALLATION
All WHR Series voltage regulators are designed to be
hard-wired to the input power and the load using copper
wire. When these units increase low input voltage to
give nominal output voltage, the input current is
substantially higher than the output current. Maximum
rated input and output currents for each unit are given
in the enclosed rating charts. Select a wire size that is
adequate to carry the maximum rated current as
specified by local and national code requirements.
The front panel(s) of the voltage regulator must be
removed to allow access to the input and load
terminals. To remove a panel, use a flat blade
screwdriver to release the ¼ turn fasteners, which hold
the front panel in place, and lift the panel off the base.
A full range of knockouts are provided in the base and
the rear panel of the unit for wire entry and exit.
The location of the power connections varies
depending on the options provided. On units with an
input circuit breaker, input connections are made
directly to the circuit breaker. On units without any
options, the input connections are located on the
POWERSTAT variable transformer. The input power
connections are labeled L1, L2 and NEUT for the three
hot lines and common. Load connections are labeled
T1, T2, and NEUT for the corresponding output lines
and are made to the POWERSTAT variable
transformer on units without any options.
In some cases the unit consists of more then one
enclosure. In these cases each enclosure will be
labeled “L” for input and “T” for output. In installing
multiple enclosure units refer to the second page of the
schematic supplied for point to point connections.
4.0.
START UP
Set the Output Voltage Range toggle switch on the
control module to the 240 volt position to match your
application. The Output Voltage Adjustment and the
Sensitivity potentiometers are set at the factory for
nominal output voltage and approximately 2%
accuracy, and should not be readjusted until the
voltage regulator is initially energized.
After all input and output connections are completed
and checked, place the front panel(s) in position and
tighten the fasteners.
Energize the regulator power source and, if provided,
place the voltage regulator's circuit breaker in the "ON"
position. The voltmeter should indicate the output
voltage (approx. 240 volts), and the POWER pilot lamp
and the CONTROL pilot lamp should be lit. This
indicates the voltage regulator is operating properly.