CONTROLLER STARTUP
11
EN1B-0022 IE10 R0717
Sylk™ Bus
The CPO-VAV2A controller has one Sylk port which is a two
wire, polarity insensitive bus that provides both 24VAC power
and communications between a Sylk-enabled sensor and a
Sylk-enabled controller. Using Sylk-enabled sensors saves I/
O on the controller and is faster and cheaper to install since
only two wires are needed and the bus is polarity insensitive.
Sylk sensors are configured using the ComfortPoint Open
Studio.
Figure 23
Sylk™ Bus Connection
Power Supply
The CPO-VAV2A controller is powered by an external NEC
Class 2 transformer. Power is internally looped in T-terminal
and remains looped after T-terminal is unplugged from the
CPO-VAV2A controller.
Figure 24
Powering CPO-VAV2A through an external transformer
Transformer requirements for one CPO-
VAV2A controller
•
Voltage: 24 VAC +/- 10% (50/60Hz)
•
Power: 15 VA
Power consumption by various components
Controller startup
When the controller delivered from the factory is powered up
for the first time, the device instance ID is set to a value
between 1 ~ 30 which is based on the MAC address. If the
MAC address changes, the device instance ID also changes
to match the MAC address. After downloading the application
to the controller, the instance ID is modified to a new value as
defined in the CPO Studio project. Subsequently, the device
instance ID does not change despite the MAC address
changes.
Therefore, to discover this unitary controller from CPO Online
tool with instance ID less than 128, enable the MSTP
channels in the system settings page of plant controller.
See “
Managing system settings
” section from “
CPO Online
User’s Guide
(EN2B 0002 IE10)
”.
Cabling
This Section describes the specifications for cables used in
making connections to the CPO-VAV2A controller.
Cable Routing
All signal cables (input/output, low voltage) are
communication circuits and should therefore be routed
separately from the line voltage. Minimum distance is 4in (100
mm).
Attention
There are no internal fuses inside T-terminal for
looped power supply. The maximum current rating
is 9 Amp. Drawing more current can damage the
product. Connect an external fuse.
TO CPO-VAV2A
DAISY-CHAINING MULTIPLE ZIOS
TO ZIO
S24VAC
N24VAC
FGND
230 VAC
24 VAC
Note
• Includes Sylkbus and actuator.
• Does not include Triac power. (Allow additional
capacity for equipment controlled from Triacs
where required).
Components
Maximum Power (VA)
Control board
8
Sylkbus
3
Actuator
2
Buffer
2
Total
15
Attention
Avoid using joints in sensor cables.
