Bray 70 Series Operation And Maintenance Manual

BRAY Series 70 Electric Actuator
Operation and Maintenance Manual
5
The back feeding of one actuator by another one wired in
parallel is eliminated by using the I.R.B.
If actuator is running Open & customer switches
“instantaneously” to run Closed, the Open relay will take
time to ‘drop-out’ & the Close relay will take time to ‘pull-in’
this time lapse is ~ 40ms. The time delay provided by the
I.R.B. will protect the switches and gears from the controller’s
instantaneous command signal reversal.
Current draws and eld wirings are not affected by
adding I.R.B.
S70 120VAC I.R.B., auxiliary switch, heater, and torque
switch option are UL certied units.
NOTICE
The conduit connections must be properly sealed to main-
tain the weatherproof integrity of the actuator enclosure.
MultiPle actuatOr (Parallel) Wiring
CAUTION
Do not connect more than one S70 actuator which do
not have I.R.B. installed to a single SPDT switch. A volt-
age is present on the opposite winding to the powered
one. If this winding is connected to another as shown in
the INCORRECT diagram it will interfere with the motor
performance. Use a multiple pole switch as shown in the
CORRECT diagram.*
actuatOr diagraM WithOut i.r.b.
CAUTION
Do not reverse motor instantaneously when it is still running.
Reversing direction to actuator motor when it is running can
cause damage to motor, switches and gearing. Directional
control switching can be done by PLC in 20ms or by a
small relay in 46ms. Therefore time delay of 1s has to be
incorporated into the control scheme to avoid damage.
traVel liMit SWitch and Mechanical traVel StOP
a
djuStMent
CAUTION
The electrical travel switches must be set to activate
(depress) prior to reaching the mechanical travel stops.
The cams are color coded (green for open, red for closed).
NOTE: Manual travel stops are designed to prevent manual
overtravel from turning the handwheel, not to stop the elec-
tric motor. The travel stops have an adjustment range of
approximately 10-degrees.
!
!
!
TP TP TP TP
OPEN
MOTOR
CLOSE
CAPACITOR CAPACITOR
CLOSE
MOTOR
OPEN
SPDT
CONTACT
INCORRECT
TWO SPDT
CONTACTS
CAPACITOR
CLOSE
MOTOR
OPEN
CAPACITOR
MOTOR
OPEN
CLOSE
CORRECT
No. 1 No. 2 No. 2No. 1
1
22 22
33
3
3
111
S70 On/Off actuatOr With interPOSing relay bOard (i.r.b.)

Bray 70 Series Specifications

General

Brand	Bray
Model	70 Series
Category	Controller
Language	English