SERIES 70 ELECTRIC ACTUATOR
Installation, Operation, and Maintenance Manual
20 of 48
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7.3
S70 On/Off Actuator with Interposing Relay Board (I.R.B.)
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
NOTE:
The host controller should use a one second time delay for command signal
reversal.
CAUTION
Apply voltage to only one direction terminal at a time.
Auxiliary Switches
I.R.B.
Interposing Relay Board
Figure 2 -
S70 with I.R.B.
FIELD WIRING
ACTUATOR
SINGLE PHASE
POWER SUPPLY
GROUND
N
L
OPEN
BLUE
CLOSE
OPEN
CLOSE
(SEE NOTE 5)
FOR HEATER OPTION ONLY
RED
YELLOW OR
BLACK
O
C
N
MOTOR
YELLOW
YELLOW
RED
RED
RED
RED
BLUE
OVERRIDE SW
CLOSE
OPEN
RED
HEATER (OPTIONAL)
BLUE
BLUE
BLUE
BLUE
GREEN
CAM
RED
CAM
N.C.
COM
N.O.
N.C.
COM
N.O.
OPEN
CLOSE
COM
COM
N.C.
N.O.
N.C.
N.O.
CL
OP
N
MC
MO
INTERPOSING RELA
Y
1
2
3
4
5
6
7
8
9
Actuator shown in closed position
Figure 3 -
Sample field wiring diagram for Series 70 actuator with I.R.B.
Actuator specific wiring diagram located inside actuator cover.
Field Wiring
Actuator
