5
Series 70 Electric Actuator
Operation and Maintenance Manual
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 and customer switches
“instantaneously” to run Closed, the Open relay will
take time to ‘drop-out’ and 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 field wirings are not affected by
adding I.R.B.
S70 120VAC I.R.B., auxiliary switch, heater, and torque
switch option are UL certified units.
NOTICE
The conduit connections must be properly sealed to
maintain 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 voltage 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 Adjustment
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 electric motor. The travel stops have an
adjustment range of approximately 10-degrees.
S70 On/Off Actuator with Interposing Relay Board (I.R.B.)
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