Bray 70 Series User Manual

SERIES 70 ELECTRIC ACTUATOR
Installation, Operation, and Maintenance Manual
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The Information contained herein shall not be copied, transferred, conveyed, or displayed in any manner
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 INTRODUCTION
The Bray Series  is a quarter turn electric actuator with manual override for use on
any quarter turn valve requiring up to  lb-in [ N m] of torque Operating
speeds vary between  to  seconds
 Principle of Operation
The Series  actuator is divided into two internal sections the power center below
the switch plate and the control center above the switch plate Below the switch
plate the gear motor with its spur gear train drives a non-backdriveable worm gear
output The override mechanism for manual operation is also housed here Above
the switch plate is where user required readily accessible components are placed
The indicator shaft assembly limit switches terminal strips torque switches heater
and electronic controllers are all placed here for easy access
External to the unit are adjustable mechanical travel stops a large and easy to read
indicator the unique manual override handwheel and dual conduit entry ports The
external coating is a high-quality polyester powder coat which has exceptional UV
protection and chemical resistance
 Electrical Operation
The gear motors used in the Bray Series  are of either permanent split capacitor
(PSC) design (single phase AC power) or permanent magnet (PM) design (DC
power) Travel limit switches are mechanical form (SPDT) with contacts rated at 
Amp ( PF)  HP  VAC
In cases where the torque capacity of the unit is exceeded to the point where the
motor stalls a thermal protector switch built into the PSC motor windings will
automatically disconnect the motor power and prevent overheating Once the motor
cools suciently the thermal protector switch will reset automatically
Optional torque switches are available in all units to prevent the possibility of stalling
the motor thus reducing the possibility of an inoperable thermal cool down period
Torque switches installed by Bray are factory adjusted to the output torque rating
of the unit using electronic torque testing equipment
 Mechanical Operation
Mechanically the ratio of the gear motor determines the speed of the unit The gear
motor utilizes high eciency spur gears with various ratios for the dierent speeds
Initial gear reduction through the spur gears is then transferred to the worm shaft
The final gear reduction and output is through a non-backdriveable worm gear set
Positioning is determined by an indicatorcam shaft which is linked to the output
shaft In the declutchable condition the manual override drives the worm shaft
when engaged

Bray 70 Series Specifications

General

Brand	Bray
Model	70 Series
Category	Controller
Language	English