Bray 75 Series User manual

The
High
Performance
Compan
y
R
SERIES 74
ELECTRIC ACTUATOR
OPERATION AND MAINTENANCE MANUAL
204450

BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
1
TABLE OFCONTENTS PAGE
SPECIFICATION ---------------------------------------------------------------------------------- 2
TRAVEL CAM & LIMIT SWITCHES ADJUSTMENT ------------------------------------------------- 3
MECHANICAL STOPS ---------------------------------------------------------------------------- 4
POTENTIOMETER -------------------------------------------------------------------------------- 4
MODULATING CONTROL BOARD ----------------------------------------------------------------- 5
TROUBLE SHOOTING ---------------------------------------------------------------------------- 6
LUBRICATION, NOTICE & STORAGE ------------------------------------------------------------ 6
PARTS FOR S74 –0890 & 1330 -------------------------------------------------------------- 7,8
PARTS FOR S74 –2210 & 3100 ------------------------------------------------------------- 9,10
WIRING DIAGRAM FOR 110V/220V AC 1-PH / ON/OFF ------------------------------------ 11
WIRING DIAGRAM FOR 110V/220V AC 1-PH / MODULATING ------------------------------ 12
WIRING DIAGRAM FOR 110V/220V AC 1-PH / MODULATING
LOCAL/REMOTE SELECTION SWITCH ----------------------------------------------------- 13
WIRING DIAGRAM FOR 110V/220V AC 1-PH / ON/OFF
LOCAL/REMOTE SELECTION SWITCH ----------------------------------------------------- 14
WIRING DIAGRAM FOR 110V/220V AC 1-PH / 4-20MA OUTPUT SIGNAL ------------------ 15
WIRING DIAGRAM FOR 110V/220V
SAME SWITCH PARALLEL WIRING -------------------------------------------------------- 16
WIRING DIAGRAM FOR 220V/380V/440V 3-PH /WITH REV. STARTER / ON/OFF ----------- 17
WIRING DIAGRAM FOR 220V/380V/440V 3-PH /WITH REV. STARTER / MODULATING ----- 18
WIRING DIAGRAM FOR 220V/380V/440V 3-PH /WITH REV. STARTER
4-20MA OUTPUT / ON/OFF -------------------------------------------------------------- 19
WIRING DIAGRAM FOR 220V/380V/440V 3-PH / 4-20MA
OUTPUT SIGNAL (NOSTARTER) ---------------------------------------------------------- 20
WIRING DIAGRAM FOR 24V DC ON/OFF ----------------------------------------------------- 21
WIRING DIAGRAM FOR 24V AC ON/OFF ----------------------------------------------------- 22
WIRING DIAGRAM FOR 220V/380V/440V 3-PH ON/OFF ----------------------------------- 23
WIRING DIAGRAM FOR 24V DC / MODULATING ---------------------------------------------- 24
WIRING DIAGRAM FOR 24V AC / MODULATING ---------------------------------------------- 25
FOR INFORMATION ON THIS PRODUCT AND OTHER BRAY PRODUCTS
PLEASE VISIT US AT OUR WEBPAGE - www.bray.com

Model Max Torque Speed (90°) Motor Motor Speed RPM 220V 380V 440V
No. In/Lbs (Nm) 60 Hz 50 Hz Power 60 Hz 50 Hz Run Start Lock Run Start Lock Run Start Lock
S74-0890 8850 (1000) 46s 55s 180W 1720 1450 0.6A 0.8A 1.8A 0.4A 0.6A 1.0A 0.4A 0.6A 1.0A
S74-1330 13,300 (1500) 46s 55s 220W 1720 1450 0.8A 1.0A 2.8A 0.6A 0.8A 1.6A 0.6A 0.8A 1.2A
S74-2210 22,100 (2500) 58s 70s 220W 1720 1450 0.8A 1.0A 1.5A 0.4A 0.6A 1.0A 0.4A 0.6A 1.0A
S74-3100 31,000 (3500) 58s 70s 300W 1720 1420 1.2A 1.4A 2.5A 0.6A 0.8A 1.5A 0.6A 0.8A 1.5A
Three Phase
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
2
SPECIFICATIONS
Model Max Torque Speed Motor Motor Speed RPM 12V DC/AC 24V DC/AC
No. In/Lbs (Nm) (90°) Power 12V 24V Run Start Lock Run Start Lock
S74-0890 8850 (1000) 46s 220W — 1800 — — — 7.0A 8.0A 30.0A
S74-1330 13,300 (1500) 46s 220W — 1800 — — — 7.5A 8.0A 30.0A
S74-2210 22,100 (2500) 58s 220W — 1800 — — — 7.5A 8.0A 30.0A
S74-3100 31,000 (3500) 58s 300W — 1800 — — — 15.0A 15.0A 26.0A
12V / 24V
RUN - Full load running current
START - Initial start-up/surge current
LOCK - Locked rotor/stalled current
Model Max Torque Speed (90°) Motor Motor Speed RPM 110V AC 220 - 240V AC
No. In/Lbs (Nm) 60 Hz 50 Hz Power 60 Hz 50 Hz Run Start Lock Run Start Lock
S74-0890 8850 (1000) 46s 55s 180W 1720 1450 3.2A 12.0A 10.0A 1.6A 4.0A 4.0A
S74-1330 13,300 (1500) 46s 55s 220W 1720 1450 4.0A 14.0A 10.0A 2.0A 3.6A 5.0A
S74-2210 22,100 (2500) 58s 70s 220W 1720 1450 4.0A 12.0A 6.0A 2.0A 4.0A 3.0A
S74-3100 31,000 (3500) 58s 70s 300W 1720 1420 4.0A 14.0A 5.0A 2.2A 4.0A 3.0A
Single Phase
DUTY CYCLE RATINGS
ALL SIZES ON/OFF DUTY 30%
S74-0890 & 1330 MOD. DUTY 75%
S74-2210 & 3100 MOD. DUTY 50%

BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
3
LS4 - Aux. switch cam factory set at full closed position.
Can be set at an intermediate position if required.
LS3 - Aux. switch cam factory set at full open position.
Can be set at an intermediate position if required.
LS2 - Close travel switch cam.
Rotate cam clockwise to decrease closed
position and vice versa.
LS1 - Open travel switch cam.
Rotate cam clockwise to increase full open
position and vice versa.
LS4
LS3
LS2
LS1
LS4
LS3
LS2
LS1
TORQUE CAM ADJUSTMENT (FACTORY SET)
S74-0890 & 1330
TS1 - Counter-clockwise: Lowers torque value trip setting.
Clockwise: Increases torque value trip setting.
TS2
TS1 TS1 - Counter-clockwise: Lowers torque value trip setting.
Clockwise: Increases torque value trip setting.
TORQUE CAM ADJUSTMENT (FACTORY SET)
S74-2210 & 3100
TS1 - Counter-clockwise: Increases torque value trip setting.
Clockwise: Lowers torque value trip setting.
TS1 - Counter-clockwise: Increases torque value trip setting.
Clockwise: Lowers torque value trip setting.
TS2
TS1
TRAVEL CAM & LIMIT SWITCH ADJUSTMENT
(ALL SIZES)
LS1 & LS2 - Open and Close travel switch cams can be
set to users preferred Open & Close valve positions.
The motor is powered via the travel switches normally
open (N.O.) contacts the cam depresses the switch lever
Closed
Direction
Open
Direction
Closed
Direction
Open
Direction
to allow motor to run. Adjusting cam so that switch lever
is not depressed will stop motor.
LS3 & LS4 - Are voltage free aux. travel indication switch
cams and can be set at any position between 0 and 90
degrees to provide remote position indication. Travel
cams can be adjusted with a 2.5mm hex key.

4
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
MECHANICAL STOPS
FOR ELECTRIC OPERATION:
Please refer to “Travel Cam & Limit Switch Adjustment”
The motor should be stopped by the end of travel limit
switches (LS1 & 2) being activated by their respective
cams.
FOR MANUAL OPERATION:
1) Slacken the locknuts & back-out the socket head
travel stop bolts.
2) Adjust open (LS1) & close (LS2) travel limit switch
cams to desired end of travel positions.
3) Using handwheel drive actuator to it’s fully open
position (confirm that open travel position switch is
activated). Turn handwheel one half turn opening
actuator more. With hex key, screw open travel bolt
in until it comes to a stop against internal stop pad.
4) Secure bolt by tightening locknut against housing.
5) Repeat steps 1 to 4 for close travel bolt.
POTENTIOMETER
Potentiometers turn with transmission shafts, and can
provide a feedback signal for position indication.
Potentiometer terminals 1, 2, 3 are wired to terminal
blocks 5, 6, 7.
When a valve is closed: 5,6 — 1K Ohm
6,7 — 0K Ohm
When a valve is opened: 5,6 — 0K Ohm
6,7 — 1K Ohm
For modulating controllers, potentiometer terminals 1, 2,
3 are wired to terminal blocks 8, 9, 10.
When a valve is closed: 8,9 — 5K Ohm
9,10 — 0K Ohm
When a valve is opened: 8,9 — 0K Ohm
9,10 — 5K Ohm
CLOSE
OPEN

5
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
MODULATING CONTROL BOARD: INTERFACE
A
Terminal Block
Green Lamp (Open Indicator)
Red Lamp (Closed Indicator)
Sensitivity Switch is set in
position 3 at factory.
Pos. 1 being most sensitive
Pos. 0 being least sensitive
(Closed angle trim pot)
Output
B
1
2
3
4
5
6
7
8
VR2
9
10
11
12
Input
Power
N
L
0
1
2
3
4
5
6
7
8
9
(Open angle trim pot)
Standard factory
setting is #1,4,& 8 ON
#2,3,5,6 &7 OFF.
87654321
ON
Yellow Lamp
(Power Light)
* S1 ~ S8 D.I.P. Switch
VR1
Input Signal
4~20mA
1~5V DC
2~10V DC
Output Signal
4~20mA
2~10V DC
Comparison
Part
Control Part
Driving Part
Control Object
AC Motor
Control Volume
Valve 90°
270°VR
(5K Ohm)
Feedback
Signal
*D.I.P.SWITCH S ETTINGS (WARNING:Disconnect power
supply prior to changing settings)
S1,2 Select Input Signal:
4-20mA, 1-ON, 2-OFF
1-5VDC, 1-OFF, 2-OFF
2-10VDC, 1-OFF, 2-ON
S3,4,5 Select Output Signal:
2-10VDC, 3-ON, 4-OFF. 5-ON
4-20mA, 3-OFF, 4-ON, 5-OFF
S6 Valve fully closed on 4mA or 1V or 2V Input
Signal and full open on 20mA or 5V or 10V
Input Signal, 6-OFF (for reverse operation
switch 6-ON)
S7,8 Position on loss of incoming control signal:
Valve will fully close –7-ON, 8-OFF
Valve will fully open –7-OFF, 8-ON
Valve will stop where it is –7-ON, 8-ON
If reverse operation (4mA to open, 20mA
to close) reverse 7 & 8 positions.
VR TRIM POT ADJUSTMENT
VR2 (Close Travel) Turn fully clockwise, provide
close signal, then turn pot. counter clockwise 3 to 6
turns until red light stays on.
VR1 (Open Travel) Turn fully counter clockwise,
provide open signal, then turn pot. clockwise 3 to 6
turns until green light stays on.

6
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
Problem Possible cause Solutions
Motor does not operate
Check supply power and voltage are correct. Check by meter.
Any blisters on the capacitor? If so replace.
Is the gear train locked-up? Remove motor to check.
Motor stops running Is power supply short circuited? Check wiring.
Any foreign objects in pipeline? Check for obstructions.
Unable to fully open/close Loose/Misaligned cam? Adjust/Tighten using wrench.
Bent valve stem? Replace valve stem.
Mechanical stop adjustment incorrect? Check position of stops.
Valve stops operating when motor Gear worn out? Replace gear.
is running. Sleeve adapter worn out or broken? Replace sleeve adapter.
Broken valve stem or actuator Replace valve stem or actuator
transmission shaft. transmission shaft?
Abnormal control for operating two or Controlling circuit connected in Refer to the wiring diagram.
more actuators simultaneously. tandem or parallel?
Motor overheats. Incorrect voltage? Check by meter.
Valve torque too high? Replace with larger actuator.
High working frequency? Check duty cycle.
Is motor stem or bearing binding? Replace the binding parts.
Occasional on/off actuator failure. Simultaneous input power on/off. Check if the selection switch is
normal.
Vibration when valve is closed. Motor brake spring fatigued or Replace spring or Teflon.
Teflon worn?
ACTUATOR TROUBLESHOOTING CHART
LUBRICATION
The gearbox of the Bray actuator is enclosed, and it has
already been lubricated sufficiently with high tempera-
ture lubricant at the factory sufficient for use for up to two
years.
IMPORTANT NOTICES & MAINTENANCE
Notices:
1. Make sure the voltage is correct before power-up.
2. Turn power off before conducting any mainte-
nance.
3. Seal the casing and conduit entrance after wiring
to prevent dust or water contamination.
4. The angle of electric actuator installation must
between 0~180 degree. Do not install upside
down or below the horizontal.
5. Do not install when hazardous or explosive gases
may be present.
6. The frequency of open and close operation is
restricted to every 5 minutes. Avoid too high a
cycle frequency.
7. When more than one electric actuator needs to
operate simultaneously, please connect with
individual cables & not in parallel.
8. Connect the ground wire to PE inside the electric
actuator.
9. The warranty period of our product is one year.
Storage:
1. The actuator should be placed in a clean and dry
place, and protected from the weather and
extreme vibration.
2. If actuator needs be stored outside, it must be
protected from excess moisture, dust, and
weather.

7
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
SERIES 74
SIZE: 0890 & 1330 (1 OF 2)
1 SCREW
2 MOUNTING PLATE
3 WINDOW PROTECTION COVER
4 HOUSING COVER
5 WINDOW
6 SCREW
7 SCREW
8 BRAKE SPRING COVER
9 BRAKE SPRING
10 MOTOR BRAKE (PTFE)
11 MOTOR
12 SCREW
13 CAPACITOR
14 MOUNTING BRACKET
15 SCREW
16 SCREW
17 FIXED PLATE
18 MOUNTING BRACKET
19 TERMINAL BLOCK
20 SCREW
21 LIMIT SWITCH
22 MOUNTING BRACKET
23 SCREW
24 SET SCREW
25 TRAVEL CAM
26 BEARING
27 1st GEAR
28 DRIVE KEY
29 2nd GEAR
30 BEARING
31 BEARING
32 SNAP RING (C TYPE)
33 DRIVE KEY
34 3rd GEAR
35 BEARING
36 SCREW
37 MOUNTING PLATE
38 SCREW
39 4th GEAR
40 BEARING
41 SNAP RING (C TYPE)
42 5th GEAR
43 BEARING
44 DRIVE KEY
45 SHAFT
46 BEARING
47 BEARING
48 INNER GEAR
49 SCREW
50 POSITION INDICATOR
51 BEARING
52 PLANET GEAR
53 POSITION INDICATOR SHAFT
54 BEARING
55 SNAP RING (C TYPE)
56 BEARING
57 OUTPUT DRIVE
58 SPRING PIN
59 O-RING
60 BEARING
61 BEARING
62 NUT
63 WASHER
64 SOCKET END SET SCREW
65 0-RING
66 BEARING
67 WORM WHEEL SHAFT
68 HAND WHEEL
69 DRIVE KEY
70 SCREW + WASHER
71 COVER PLATE
72 OIL SEAL
73 SOCKET HEAD SCREW
74 HOUSING BASE
75 OIL SEAL

BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
SERIES 74
SIZE: 0890 & 1330 (2 OF 2)
76 SCREW*
77 TORQUE LIMIT SWITCH*
78 MOUNTING PLATE*
79 SPACER*
80 TORQUE CAM*
81 SCREW*
82 SNAP RING (E TYPE)*
83 WASHER*
84 SCREW*
85 MOUNTING PLATE*
86 BEARING*
87 BEARING*
88 TORQUE DRIVE SHAFT*
* OPTIONAL
89 WORM SHAFT
90 BEARING
91 SPRING WASHER*
92 BEARING*
93 BUSHING*
94 WASHER*
95 NUT*
96 0-RING*
97 FIXED SEAT*
98 OIL SEAL*
99 SNAP RING (C TYPE)*
100 SOCKET HEAD SCREW*
8

BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
SERIES 74
SIZE: 2210 & 3100 (1 OF 2)
1 SCREW
2 MOUNTING PLATE
3 WINDOW PROTECTION COVER
4 WINDOW
5 HOUSING COVER
6 SCREW
7 MOTOR
8 SCREW
9 MOTOR BRAKE (PTFE)
10 BRAKE SPRING
11 BRAKE SPRING COVER
12 SCREW
13 SCREW
14 POSITION INDICATOR
15 CAPACITOR
16 SCREW
17 MOUNTING BRACKET
18 SCREW
19 MOUNTING PLATE
20 SHAFT
21 BEARING
22 BEARING
23 GEAR
24 GEAR
25 SCREW
26 SHAFT
27 MOUNTING PLATE
28 TRAVEL CAM
29 SET SCREW
30 LIMIT SWITCH
31 SCREW
32 MOUNTING PLATE
33 MOUNTING BRACKET
34 SCREW
35 TERMINAL BLOCK
36 DRIVE KEY
37 BEARING
38 1st GEAR
39 BEARING
40 SHAFT
41 MOUNTING PLATE
42 SCREW
43 BEARING
44 SNAP RING (C TYPE)
45 2nd GEAR
46 BEARING
47 DRIVE KEY
48 BEARING SHAFT
49 BEARING
50 BEARING
51 INNER GEAR
52 BEARING
53 PLANET GEAR
54 BEARING
55 SNAP RING (C TYPE)
56 BEARING
57 OUTPUT GEAR
58 O-RING
59 BEARING
60 SCREW
61 GEAR
62 POSITION INDICATOR SHAFT
63 PIN
64 SCREW
65 COVER PLATE
66 BEARING
67 O-RING
68 BEARINGS
69 HOUSING BASE
70 BEARING
71 WORM WHEEL SHAFT
72 O-RING
73 BEARING
74 MOUNTING PLATE
75 OIL SEAL
76 HAND WHEEL
77 DRIVE KEY
78 SCREW + WASHER
79 SCREW
80 NUT
81 OUTPUT BASE
82 WASHER
83 SCREW
84 BEARING
85 BUSHING
86 SCREW
87 SCREW
88 BEARING
89 OUTPUT WORM GEAR
90 BEARING
91 O-RING
92 OUTPUT BASE FLANGE
93 SCREW
94 OIL SEAL
9

10
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
SERIES 74
SIZE: 2210 & 3100 (2 OF 2)
95 SCREW*
96 TORQUE LIMIT SWITCH*
97 MOUNTING PLATE*
98 SPACER*
99 TORQUE CAM*
100 SET SCREW*
101 SNAP RING (E TYPE)*
102 WASHER*
103 SCREW*
104 MOUNTING PLATE*
105 BEARING*
106 BEARING*
107 TORQUE DRIVE SHAFT*
108 SPRING*
109 BEARING*
* OPTIONAL
110 BUSHING*
111 O-RING*
112 MOUNTING PLATE*
113 SCREW
114 O-RING
115 WASHER
116 WASHER
117 OIL SEAL*
118 WORM WHEEL
119 COVER PLATE
120 BUSHING
121 BEARING
122 SPRING
123 SCREW*

11
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
DIAGRAM ABBREVIATIONS
1. MC1 and MC2: Electromagnetic Contactor
2. C.S.: Control Switch
3. Duty Cycle: our standard modulating type S74-1330
is 75% duty cycle and S74-3100 is 50% duty cycle.
4. PE - Actuator grounding connection.
5. LS1 & 2 - Open & Close travel limit switches.
LS3 & 4 - Aux travel indication swithes (voltage free
contacts)
6. TS1 & 2 - Open & Close overtorque switches (optional)
WIRING DIAGRAM S74 - 890 & 1330 SIZES 110V / 220V AC 1-PH / ON-OFF SERVICE
134567ABCDEF
NL
Power Supply
110/220V
1-PH
LS1 LS2
ACTUATOR
CS
Note: Typical field wiring shown
with dashed lines.
PE
TS1 TS2
LS3 LS4
NC
COM
OPEN CLOSE
COM
NO
NC
COM
NO NC
COM
NO
NCNO
COM
NCNO
COM
NCNO
M
C
Heater
Fully closed ind. Lamp Fully open ind. Lamp
G
(optional) (optional)
Actuator drawn for it's fully
closed postion (close travel
switch "LS2" has been
tripped.)
Connect to remote position
indication circuit, if required.

12
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
WIRING DIAGRAM S74 - 890 & 1330 SIZES 110V / 220V AC 1-PH / MODULATING SERVICE
1234567
8910 11 12
N
L
+
-
5K
AB
CDE
Modulating Control Board
110/220V AC
LS4
LS3
Note:
(1) Input Signal :
4-20mA or
1-5V or
2-10V.
(2) Output Signal :
4-20mA or
2-10V.
LS2
LS1
TS2
TS1
F
4321
M
90/180 DC
F
BA
Position Feedback Signal
-
+
INT POT
NO NC
COM
NO NC
COM
NO NC NO NC
COM
NO NC
COM
NO NC
COM
COM
Connect to remote position
indication circuit if required.
Heater
Input Signal
(Use shielded wire &
ground shield on one
end only.)
Power Supply
(optional) (optional)

13
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
WIRING DIAGRAM S74 110V / 220V AC 1-PH / MODULATING SERVICE
LOCAL / REMOTE SELECTOR SWITCH
5K
Modulating Control Board
TS1
Pot.
LS1 LS2
7
N
L
6
5
4Heater
Switch (1)
Switch (2)
Remote
Local
Close
Open
GRO
Lamp
(open)
Lamp
(close)
Lamp
(power)
_
A
D
C
B
F
E
12111098
TS2
M
C
123
RY1
-
+
-
+
(Optional) (Optional)
Input Signal
4-20mA or
2-10V or 1-5V.
Output Signal
4-20mA or 2-10V.
Power Supply
110/120V
1-PH.
+
Connect
to remote
position
indication
circuit if
required.
LS3
LS4

14
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
WIRING DIAGRAM S74 110V / 220V AC 1-PH / ON-OFF SERVICE
LOCAL / REMOTE SELECTOR SWITCH
134567
PE
RG
O
M
C
S2
S1
Remote
Open Close
Close Open
LS1LS2
Lamp (power)
Heater
Lamp (open)
Lamp (closed)
(optional)
TS2
(optional)
TS1
B
LS3
A
LS4
F
E
D
C
Local
GLN
Power Supply
110V/220V
Customer's
remote control
switch.
Connect to remote position
indication circuit, if required.

15
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
WIRING DIAGRAM S74 110V / 220V AC 1-PH / 4-20MA OUTPUT SIGNAL
134567ABCDEF
NG L
Power Supply
110V/220V
1-PH
TS1 TS2
LS3 LS4
ACTUATOR
Fully open indicator (Lamp) Fully closed indicator (Lamp)
PE
LS1 LS2
89
4-20mA
Output Signal
(optional)
M
(optional)
R13
R14
*R14 adjusts 4mA
*R13 adjusts 20mA
(optional)
Heater
Customer's
remote control
switch.
Open Close
Connect to remote position
indication circuit, if required.

16
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
WIRING DIAGRAM S74 110V / 220V SAME SWITCH CONNECTION WIRING
1
3
4
5
6
C
1
5
4
3
6
B
1
5
4
3
6
A
Full close
close
open
Full open
close
open
close
open
Ra1
Rb1
Rb2
Ra2
Rb3
Ra3
close
open
R
110V/220V
Power
L
N
Single phase
7
7
7
WARNING - Do not wire multiple
single phase on/off duty actuators
in parallel with common contacts.
Example shown for three single
phase actuators, two (A & B) being
in their closed position & the third
one (C) being fully open.
NOTE: Three sets of relay contacts
are used, if they were all connected
to one set of contacts the resultant
parallel configuration would cross
feed the motors and damage them.
Ra-1 to 3 N.O. contacts on R
Rb-1 to 3 N.C. contacts on R
Full close
Full open
Full close
Full open
Actuator "A"
Actuator "B"
Actuator "C"
Relay
Coil

17
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
WIRING DIAGRAM S74 220V / 380V / 440V 3-PH / ON-OFF SERVICE
LOCAL / REMOTE SELECTOR SWITCH
A
B
C
E
F
LS1 LS2
D
W
V
U
Heater
Switch (1)
Switch (2)
Remote
Local
Close
Open
GRO
Lamp
(open)
Lamp
(close)
Lamp
(power)
110V
1
3
4
TS1 TS2
M
MC1-a
MC2-a
MC2-a
MC2-a
MC1-a
MC1-a
MC2-b MC1-b
MC1 MC2
open
close
LS4
LS3
Power Supply
220V/380V
440V 3-PH
L1
L2
L3
Customer's
remote
control
switch.
Connect
to remote
position
indication
circuit if
required.

18
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
WIRING DIAGRAM S74 220V / 380V / 440V 3-PH / MODULATING SERVICE
67 11
12
+
-
5K
Modulating Control Board
LS1
Potentiometer
Output Signal
4-20mA
or 2-10V.
TS1 TS2
LS2
W
V
U
Heater
Switch (1)
Switch (2)
Remote
Local
Close
Open
M
GRO
Lamp
(open)
Lamp
(close)
Lamp
(power)
Power Supply
220V/380V
Note:
1. Change over any two lines of three phase lines power supply when the power lamp is off.
2. When you select the local control, you need to control the actuator by switch (2).
3. Input Signal: 4-20mA, or 2-10V, or 1-5V
4. Output Signal: 4-20mA or 2-10V
440V 3-PH
110V
-
+
MC2-a
MC1-a
MC2-a
MC2-a
MC1-a
L1
L2
L3
MC1-a
MC1-b
MC2-b
MC1 MC2
C
B
A
F
E
D
Input Signal
(Use shielded wire &
ground shield on one
end only.)
Connect
to remote
position
indication
circuit if
required.
LS3
LS4

19
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
WIRING DIAGRAM S74 220V / 380V / 440V 3-PH / ON-OFF SERVICE
LOCAL / REMOTE SELECTION SWITCH / 4-20mA OUTPUT SIGNAL
A
B
C
E
F
(optional) (optional)
LS1 LS2
D
W
V
U
Heater
Switch (1)
Switch (2)
Remote
Local
Close
Open
GRO
Lamp
(open)
Lamp
(close)
Lamp
(power)
110V
1
3
4
TS1 TS2
M
MC1-a
MC2-a
MC2-a
MC2-a
MC1-a
MC1-a
MC2-b MC1-b
MC1 MC2
R13
R14
*R13 adjusts 20mA
*R14 adjusts 4mA
8
9
4-20mA
output
signal
(optional)
open
close
Customer's
remote
control
switch.
Connect
to remote
position
indication
circuit if
required.
Position
feedback
signal
card.
LS3
LS4
Power Supply
220V/380V
440V 3-PH
L1
L2
L3