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CABLING
Cable lengths and cross sectional areas
Signal type
Cross-sectional
Less than or
equal to 300 Ft.
(100m)
Power
Less than or
supply (24
equal to 16
VAC)
AWG (Greater
than or equal
to 1.5 mm
)
2
Low current
Less than or equal to 20 AWG (Greater than or
signals
equal to 0.5 mm
1
1.E.g. for 0-10 VDC input, NTC20K, PT1000, dry
contact, 0-10 VDC output.
Attention
The maximum length of a signal cable with 24
VAC supply is 550 ft. (170 m). The max. length of
a two-wire, 0-10 Vdc signal cable is 1300 ft. (400
m). The secondary side of the transformer must
not be connected to earth ground.
Installing a fuse on the secondary side of the
transformer is recommended to protect the
devices against incorrect wiring.
MS/TP cable specification
Use Belden 9841 or Equivalent cable with the following
specifications
•
An MSTP EIA-485 network shall use shielded, twisted-pair
cable with characteristic impedance between 100 and 130
ohms.
•
Distributed capacitance between conductors shall be less
than 100 pF per meter (30 pF per foot).
•
Distributed capacitance between conductors and shield
shall be less that 200 pF per meter (60 pF per foot).
•
Foil or braided shields are acceptable.
•
The maximum recommended length of an MS/TP segment
is 1000 meters.
Sylk Bus cable specification
•
Polarity insensitive
•
Can use daisy chain wiring for multiple Sylk devices. If
wire size is too thick for two wires in the terminal, use
pigtails.
EN1B-0022 IE10 R0717
Less than or
Less than or
equal to 500 ft.
equal to 1300 ft.
(170 m)
(400 m)
Less than or
-
equal to 14
AWG (Greater
than or equal to
)
2
Recommended maximum distance
from controller to any Sylk device
Quantity
Single twisted pair, non-
and type of
shielded, stranded or solid
device
18-22 AWG
3 wall
500 ft
modules,
(150 m)
any type
Connection drawings
This section describes example connection drawings of the
CPO-VAV2A controller with:
•
MS/TP bus
•
Sylk bus
•
24 VAC power, and IO connection
12
Standard
thermostat wire, (non-
twisted), shielded or
nonshielded, stranded or
solid
24 AWG
18-24 AWG
400 ft
100 ft
(120 m)
(30 m)
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