CONTROL CENTER
CONTROL CENTER
FEATURES
TORQUE LIMITING
SWITCHING SYSTEM (Optional)
The torque limiting switching system
consists of two SPDT mechanical
switches and two factory calibrated
adjusting screws. The green screw
adjusts the torque limit in the open
direction, and the red screw adjusts
the torque limit in the closed direc-
tion. The switches independently
respond to predetermined loads in
both the open and closed travel
directions by sensing the movement
of the worm shaft, and interrupting
the electrical power to the motor.
The switches can operate at any
point of actuator travel.
CLEAN AND EASY
ACCESS TO ALL
FIELD WIRING AND
ADJUSTMENTS
Bray has specifically
engineered the R
4
Control Center for
customer–friendly
convenience. Designed
like a junction box, the
R
4
offers by far the
easiest access to
terminal block wiring,
cam adjustments and
switch installation.
Accessories are easily
added, either before
installation or after
installation. There-
fore, the time required
for field start-up and
adjustment is greatly reduced,
and maintenance can be per-
formed with assured ease and
safety.
Bray’s unique design, modu-
lar system of components and
accessories, and innovative
features combine to best meet
today’s industrial requirements.
TRAVEL LIMIT SPDT SWITCHES
(A)
Bray has provided two SPDT
switches as standard. These durable,
high quality switches are mechani-
cally isolated and electrically indepen-
dent. The dedicated circuits eliminate
any voltage crossover between the
switches. This switch combination is
used for both open and closed
positions of the valve and requires
only one cam for each direction of
valve travel. Bray’s design provides
synchronicity between motor control
and position display. Switches are
easily accessible without interference
from other components. Each switch
is marked with open or close labels
and the cams are color coded, green
for open and red for close, eliminat-
ing the possibility of making wrong
adjustments of travel limits or field
wiring errors.
AUXILIARY SWITCHES
(Optional)
Independent dry-contact SPDT
switches are available to indicate
travel position to remote customer
control circuits.
AUTOMATIC POWER
CUTOUT SWITCH (B)
The R
4
is supplied with a SPDT
mechanical switch which cuts power
to the motor when the handwheel
is engaged for manual operation.
This switch also functions as a safety
emergency shutdown device that
immediately stops the actuator motor
even if electrical power is still being
applied to the motor.
CERTIFICATIONS / APPROVALS
Bray has gained UL, CSA and CE
certifications on most intermittent
and continuous duty units. These
certifications insure that the R
4
has
been designed to the highest quality
requirements and most stringent
safety standards worldwide.
Sub-
stantial resources have been
invested to assure our customers
that the
R
4
is the best actuator on
the market and will remain so.
Red
Round
Rotary
Reliable
4
R
R
4
APPLICATIONS
The R
4
is the ideal choice for process
control applications involving:
• Automation and computer systems
• Butterfly, ball, plug and other
rotary valves
• Dampers, switches, safety and
flow-control devices
• Machine and fixture indexing
• Hostile environments demanding
excellent moisture, chemical and
corrosion resistance
• Long service life and rugged
reliability
INDUSTRIES
Bray’s R
4
Electric Actuators are used
in a wide range of industries world
wide, including:
Chemical, Pharmaceutical, Petroleum
Refining and Oilfield, Microelectronics,
Pulp and Paper, Water and Waste
Water Treatment, Brewing, Food
Processing, Beverages, Power,
Marine, Mining, Textile and HVAC.
™
Torque Limit Switches shown with
mounting bracket sectioned for clarity.
4
(61 Seiten)
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