
800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA / CARIBBEAN
5
SY Actuator Wiring Diagram, SY1…5-24 – Multiple Wiring
SY1…12-110 (220) – Multiple Wiring
Observe class 1 and class 2 wiring restrictions.
Transformer sizing = SY actuator draw X 1.25 (safety margin)
(Ex. SY2-24 requires 3.0A x 1.25 = 3.75A,
3.75A X 24 VAC = 90VA Transformer).
Indicates an action or condition that may cause irreversible damage to the
actuator(s) or associated equipment.
Equipment damage!
Power consumption and input impedance must be observed.
Isolation relays are required in parallel applications.
The reason parallel applications need isolation relays is that the motor uses
two sets of windings, one for each direction. When one is energized to turn
the actuator in a specific direction a voltage is generated in the other due to
the magnetic field created from the first. It’s called back EMF.
This is OK with one actuator because the voltage generated in the second
winding isn’t connected to anything so there is no flow; it has no magnetic
effect on the motor.
On parallel applications without isolation, this EMF voltage energizes the
winding it is connected to on the other actuators in the system, the actuators
are then trying to turn in both directions at once. The EMF voltage is always
less than the supply voltage due to the resistance of the windings, so while
the actuator still turns in the commanded direction, the drag from the other
reduces the torque output and causes overheating.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, may result in
minor or moderate injury. It may also be used to alert against unsafe practices.
Warnings and Cautions appear at appropriate sections throughout this
manual. Read these carefully.
Hazard Identification
INSTALLATION NOTES
G Ground
1 Common
3 Open
4 Closed
5
6
7
HTR
A
B
C
D
E
F
LS3
A-C
(Open Indication)
LS4
D-F
(Closed Indication)
Contact Rating: 5A 250 VAC Max.
G Ground
1 Common
3 Open
4 Closed
5
6
7
HTR
A
B
C
D
E
F
LS3
A-C
(Open Indication)
LS4
D-F
(Closed Indication)
Contact Rating: 5A 250 VAC Max.
SY2…12-110 (220)
SY2…12-110 (220)
Open
Close K1-B
K1-A
Actuator A
Actuator B
120 or 230 VAC
N L1
H L2
NOTES
•Caution: Power Supply Voltage.
• Isolation relays must be used in parallel connection of multiple actuators
using a common control signal input. Should be DPDT.
• "H" (L2) cannot be connected to terminal #3 and #4 simultaneously.
•Required: Terminal #7 needs to be field wired to enable heater circuit.
SY1 -24
A
B
C
E
F
Contact Rating: 5A 125 VAC Max.
3A 250 VAC Max.
A-B (Open Indication)
LS4
LS3
A-E (Closed Indication)
SY1-110 (220)
A
B
C
E
F
Contact Rating: 5A 125 VAC Max.
3A 250 VAC Max.
A-B (Open Indication)
LS4
LS3
A-E (Closed Indication)
SY1 Contact Arrangements
G
G
K1
W549_11
24V AC Transformer
Line
Voltage
G Ground
1 Common
3 Open
4 Closed
5
6
7 HTR
A
B
C
D
E
F
LS3
A-C
(Open Indication)
LS4
D-F
(Closed Indication)
Contact Rating: 5A 250 VAC Max.
SY2…5-24
G Ground
1 Common
3 Open
4 Closed
5
6
7 HTR
A
B
C
D
E
F
LS3
A-C
(Open Indication)
LS4
D-F
(Closed Indication)
Contact Rating: 5A 250 VAC Max.
SY2…5-24
K1
Open
Close K1-B
K1-A
Actuator A
Actuator B
G
G
*
*
Wirin
or
ontrol Valves
On/Off
24V
110/120/230
50904 - 02/12 -
ubject to change.
Belimo Aircontrols
U
A
, Inc.