SPYDER® BACNET® PROGRAMMABLE CONTROLLERS
62-0310—04 6
NOTES:
— For multiple controllers operating from a single
transformer, the same side of the transformer
secondary must be connected to the same power
input terminal in each controller. Controller
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). The
earth ground terminal (terminal 3) must be
connected to a verified earth ground for each
controller in the group (see Fig. 11 on page 6).
— All loads on the controller must be powered by the
same transformer that powers the controller itself.
A controller can use separate transformers for
controller power and output power.
— Keep the earth ground connection (terminal 3)
wire run as short as possible.
— Do not connect the universal input COM
terminals, analog output COM terminals or the
digital input/output COM terminals to earth
ground.
The 24 Vac power from an energy limited Class II power
source must be provided to the controller. To conform to Class
II restrictions (U.S. only), the transformer must not be larger
than 100 VA.
Fig. 10 depicts a single controller using one transformer.
IMPORTANT
Power must be off prior to connecting to or removing
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
Connect terminal 2, (the 24 Vac common [24 VAC
COM] terminal) to earth ground (see Fig. 10).
Fig. 10. Power wiring details for one controller per transformer.
More than one controller can be powered by a single
transformer. Fig. 11 shows power wiring details for multiple
controllers.
NOTE: Controller configurations are not necessarily limited
to three devices, but the total power draw, including
accessories, cannot exceed 100 VA when powered
by the same transformer (U.S. only).
Fig. 11. Power wiring details for two or more controllers per transformer.
M29684A
TRANSFORMER
OUTPUT
DEVICE
POWER
ΔP
1
2
3456
78
109 2345678 09
11 1111111 21
1
2
34
5
6
78
0
9
2
22
22
2
2
22
3
3
1
2
34
5
6
78
0
9
3
3
3
33
33
34
EARTH
GROUND
1
LINE VOLTAGE
GREATER
THAN 150 VAC
WHEN CONNECTIONG POWER TO THE SPYDER BACnet
CONTROLLER, CONNECT THE COM LEG OF THE VAC SECONDARY
CIRCUIT TO A KNOWN EARTH GROUND.
1
COM
24 VAC
CONNECT POWER TO
TERMINALS 1 AND 2
M29685A
120/240
VAC
TRANSFORMER
OUTPUT
DEVICE
POWER
ΔP
1
2
3456
78
109 2345678 09
11 1111111 21
1
2
34
5
6
78
0
9
2
22
22
2
2
22
3
3
1
2
34
5
6
78
0
9
3
3
3
33
33
34
COM
24 VAC
ΔP
1
2
3456
78
109 2345678 09
11 1111111 21
1
2
34
5
6
78
0
9
2
22
22
2
2
22
3
3
1
2
34
5
6
78
0
9
3
3
3
33
33
34
ΔP
1
2
3456
78
109 2345678 09
11 1111111 21
1
2
34
5
6
78
0
9
2
22
22
2
2
22
3
3
1
2
34
5
6
78
0
9
3
3
3
33
33
34
CONNECT POWER TO
TERMINALS 1 AND 2
EARTH
GROUND
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