SYLK™ I/O DEVICES
31-00028—02 6
Electrical Shock Hazard.
Can cause severe injury, death or property
damage.
Disconnect power supply before beginning wiring
or making wiring connections, to prevent electrical
shock or equipment damage.
NOTES:
— For multiple controllers and devices operating
from a single transformer, the same side of the
transformer secondary must be connected to
the same power input terminal in each control-
ler. Controller and device configurations will
not necessarily be limited to three devices, but
the total power draw, including accessories,
cannot exceed 100 VA when powered by the
same transformer (U.S. only). For power and
wiring recommendations, See “Power” on
page 3. The earth ground terminal (terminal 3)
must be connected to a verified earth ground
for each controller or device in the group (see
Fig. 6 on page 7).
— All loads on the controller and device must be
powered by the same transformer that powers
the controller and device themselves. A con-
troller can use separate transformers for con-
troller power and output power.
— Keep the earth ground connection (terminal 3)
wire run as short as possible.
— Do not connect the universal input COM termi-
nals, analog output COM terminals or the digi-
tal input/output COM terminals to earth
ground. Refer to Fig. 4–Fig. 6 for wiring exam-
ples.
The 24 Vac power from an energy limited Class II power
source must be provided to the controller and device. To
conform to Class II restrictions (U.S. only), the transformer
must not be larger than 100 VA.
Fig. 4 depicts a single controller using one transformer.
IMPORTANT
Power must be off prior to connecting to or remov-
ing connections from the 24 Vac power (24
Vac/24 Vac COM), earth ground (EGND), and 20
Vdc power (20 Vdc) terminals.
IMPORTANT
Use the heaviest gauge wire available, up to
14 AWG (2.0 sq mm), with a minimum of 18 AWG
(1.0 sq mm), for all power and earth ground wiring.
Screw-type terminal blocks are designed to accept
up to one 14 AWG (2.0 sq mm) conductor or up to
two 18 AWG (1.0 sq mm) conductors. More than
two wires that are 18 AWG (2.0 sq mm) can be con-
nected with a wire nut. Include a pigtail with this
wire group and attach the pigtail to the terminal
block.
IMPORTANT
If the controller and device are used on Heating
and Cooling Equipment (UL 1995, U.S. only) and
the transformer primary power is more than 150
volts, connect terminal 2, (the 24 Vac common [24
VAC COM] terminal) to earth ground (see Fig. 5).
For these applications, only one controller and
device can be powered by each transformer.
NOTES:
— Unswitched 24 Vac power wiring can be run in
the same conduit as the L
ONWORKS® cable.
— Maintain at least a 3 in. (7.6 cm) separation
between Triac outputs and LONWORKS® wiring
throughout the installation.
Fig. 4. Power wiring details for one controller
per transformer.
Fig. 5. Transformer power wiring details for one
controller used in UL 1995 equipment (U.S. only).
More than one controller and device can be powered by a
single transformer. Fig. 6 shows power wiring details for
multiple controllers.
CONNECT POWER TO
TERMINALS 1 AND 2
EARTH
GROUND
(TERMINAL 3)
TRANSFORMER
OUTPUT
DEVICE
POWER
M23557
Δ
P
1
2
3 4 5 6
7 8
1 0 9 2 3 4 5 6 7 8 0 9
1 1 1 1 1 1 1 1 1 2 1
1
2
3 4
5
6
7 8
0
9
2
2 2
2 2
2
2
2 2
3
3
1
2
3 4
5
6
7 8
0
9
3
3
3
3 3
3 3
3 4
COM
24 VAC
M23558A
EARTH
GROUND
(TERMINAL 3)
TRANSFORMER
OUTPUT
DEVICE
POWER
ΔP
1
2
3 4 5 6
7 8
1 0 9 2 3 4 5 6 7 8 0 9
1 1 1 1 1 1 1 1 1 2 1
1
2
3 4
5
6
7 8
0
9
2
2 2
2 2
2
2
2 2
3
3
1
2
3 4
5
6
7 8
0
9
3
3
3
3 3
3 3
3 4
EARTH
GROUND
1
LINE VOLTAGE
GREATER
THAN 150 VAC
IF THE CONTROLLER IS USED IN UL 1995 EQUIPMENT AND THE
PRIMARY POWER IS MORE THAN 150 VOLTS, GROUND 24 VAC COM
SIDE OF TRANSFORMER SECONDARY.
1
COM
24 VAC
CONNECT POWER TO
TERMINALS 1 AND 2
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