Bray 70 OPERATING MANUAL
SERIES 70
TUNNEL DAMPER MODEL ELECTRIC ACTUATOR
OPERATION AND MAINTENANCE MANUAL
BRAY Series 70 Tunnel Damper Electric Actuator
Operation and Maintenance Manual
Table of Contents
Safety Instructions - Definition of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.1 Hazard-free use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.2 Qualified Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Principle Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Electrical Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Mechanical Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
CW vs CCW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Elevated Temperature Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Manual Override Operation (Declutchable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Pre-Installation Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Mounting to a Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Travel Limit Switch and Mechanical Travel Stop Adjustment . . . . . . . . . . . . . . . . . . . . . . . . .5
Clockwise Travel Switch adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Counter-Clockwise Travel Switch adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Typical Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Disassembly and Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Appendix A - Basic Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Appendix B - Actuator Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Exploded View Series 70 Tunnel Damper Model Housing Size 12 . . . . . . . . . . . . . . . . . . . . . . . 10
Exploded View Series 70 Tunnel Damper Model Housing Size 30 . . . . . . . . . . . . . . . . . . . . . . . 11
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Operation and Maintenance Manual
SAFETY INSTRUCTIONS - DEFINITION OF TERMS
READ AND FOLLOW THESE INSTRUCTIONS
SAVE THESE INSTRUCTIONS
WARNING
CAUTION
NOTICE
indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
indicates a potentially hazardous situation which, if not avoided, may result
in minor or moderate injury.
used without the safety alert symbol indicates a potential situation which, if
not avoided, may result in an undesirable result or state, including property
damage.
1.1 HAZARD-FREE USE
This device left the factory in proper condition to be safely
installed and operated in a hazard-free manner. The notes
and warnings in this document must be observed by the
user if this safe condition is to be maintained and hazardfree operation of the device assured.
Take all necessary precautions to prevent damage to the
actuator due to rough handling, impact, or improper
storage. Do not use abrasive compounds to clean the
actuator, or scrape metal surfaces with any objects.
The control systems in which the actuator is installed must
have proper safeguards to prevent injury to personnel, or
damage to equipment, should failure of system components
occur.
• Is trained in the proper use and care of personal
protective equipment (PPE) in accordance with
established safety practices
• Is trained in first aid
• In cases where the device is installed in a potentially
explosive (hazardous) location – is trained in the
operation, commissioning, operation and maintenance
of equipment in hazardous locations
WARNING
The actuator must only be installed, commissioned,
operated and repaired by qualified personnel.
The device generates large mechanical force during
normal operation.
1.2 QUALIFIED PERSONNEL
A qualified person in terms of this document is one who
is familiar with the installation, commissioning and operation of the device and who has appropriate qualifications,
such as:
• Is trained in the operation and maintenance of electric
equipment and systems in accordance with established
safety practices
• Is trained or authorized to energize, de-energize,
ground, tag and lock electrical circuits and equipment
in accordance with established safety practices
2
All installation, commissioning, operation and
maintenance must be performed under strict observation
of all applicable codes, standards and safety regulations.
Reference is specifically made here to observe all
applicable safety regulations for actuators installed in
potentially explosive (hazardous) locations.
BRAY Series 70 Tunnel Damper Electric Actuator
Operation and Maintenance Manual
Part NumberiNg SyStem refereNce chart
SerieS torque code SPeed Product Style Voltage trim dir
70 AAA W 113 X Y 536 /Z
houSiNg
Size
Use this chart as a guide to interpret the S70 Tunnel Damper electric actuator part number.
Part Number
12 70-0122-113E0-536 1200 15 120 VAC
12 70-0202-113E0-536 2000 15 120 VAC
30 70-0302-113E0-536 3000 18 120 VAC
30 70-0502-113E0-536 5000 18 120 VAC
INTRODUCTION
The Bray Series 70 Tunnel Damper Electric Actuator is a
quarter turn electric actuator with manual override for use
on any quarter turn valve requiring up to 5000 in.lb of torque.
Operating speeds vary between 15 to 18 seconds.
PRINCIPLE OF OPERATION
The Series 70 Tunnel Damper electric actuator is divided
into two internal sections; the power center below the
switchplate, and the control center above the switchplate.
Below the switchplate the capacitor and gearmotor, with
its spur geartrain, drive a non-backdriveable worm gear
output. The override mechanism for manual operation
is also housed here. Above the switchplate is where user
required, readily accessible components are placed. The
camshaft assembly, limit switches, terminal strips, and
heater are all placed here for easy access. External to the
unit are adjustable mechanical travel stops, the unique
manual override handwheel, and dual conduit entry ports.
The external coating is a high quality polyester powder coat
which has exceptional UV as well as chemical resistance.
ELECTRICAL OPERATION
The motors used in the Bray Series 70 Tunnel Damper electric actuator are permanent induction split capacitor design
(single phase AC power). Travel limit switches are mechanical
form ZZ(DPDT-DB) with contacts rated at 10 amp (0.8 PF),
1/2 HP 125/250 VAC. In cases where the torque capacity of
the unit is exceeded to the point where the motor stalls and
overheats, a thermal protector switch built into the motor
windings will automatically disconnect the motor power.
Once the motor cools sufficiently the thermal protector
switch will reset.
torque
(In.Lbs)
SPeed, ¼ turN
(Seconds)
SuPPly
(Voltage)
MECHANICAL OPERATION
Mechanically, the ratio of the gear motor determines the
speed of the unit. The gear motor utilizes high efficiency
spur gears. 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 linked to
the output shaft. In the declutchable condition the manual
override drives the worm shaft when engaged.
CW VS CCW
Due to the fact that the Series 70 is a rotary actuator, there are
two directions that it can turn to actuate a device: clockwise
and counter-clockwise. Depending on the application the
actuator is going into, and the physical constraints that
application presents, it may be preferential to designate
which direction the actuator turns to open and close. This
is accomplished with the /Z designator, which assigns the
open direction of the actuator: CW for clockwise and CCW
for counter-clockwise. This can be easily determined locally
by looking at which direction the open arrow is pointing
on the actuator hand wheel, and should be kept in mind
when mounting the actuator to the device. To ensure proper
function, the direction of travel should always align with
the arrows on the hand wheel and the /Z designator in
actuator part number.
ELEVATED TEMPERATURE RATINGS
The Series 70 actuator is certified to meet NEMA type 4/4x
specifications. The actuator utilizes a thermally protected,
permanent split-capacitor (PSC) motor coupled to a gear
train, allowing operation after experiencing elevated
ambient temperatures. It has been tested to and complies
with NYCTA Master Specification 15ID dated 7/16/12 –
Dampers and Accessories for Tunnel Ventilation and Station
Smoke Management, certifying it for use after soaking at
an elevated ambient temperature of up to 302°F (150°C)
for a minimum of 1 hour without the use of an insulated
thermal blanket.
W - DESIGNATES THE SPEED
2 15/18 seconds
X - DESIGNATES STYLE
E Basic Unit - Declutchable
Y - DESIGNATES THE VOLTAGE
0
/Z - DESIGNATES DIRECTION OF OPEN TRAVEL
/CW
/CCW
120VAC
Clockwise
Counter-Clockwise
3
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