KMC Controls KMD-5210, Инструкция по установке и эксплуатации

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KMD–5210 Installation and Operation
Revision E
Operation
Applying power
27
SECTION 3
Operation
This section provides general operating instructions for your
KMD-5210 LAN Controller. Included are a description of the
Isolation Bulbs, the LED status display, and instructions for resetting
the controller. Carefully review this information as it applies to the
task at hand.
Applying power
The KMD-5210 LAN Controller is automatically powered when the power
supply module is connected and plugged in. Verify all external connections
are complete before applying power to the controller.
If an error in an EIA–485 network is indicated by a glowing lamp near one of
the EIA–485 connectors, remove power and troubleshoot the circuit before
you reapply power to the controller. (See
Isolation Bulbs in the following
section.)
Lights and
indicators
The controller provides a number of different status and diagnostic indicators.
These are described in this section.
Isolation bulbs
Located near each EIA–485 connector you will find two small glass bulbs.
These serve as protective isolation devices for the Tier 2 and BACnet MS/TP,
EIA–485 networks. The bulbs serve three functions:
◆
When illuminated they indicate improper network phasing. Improper
phasing occurs when the ground potential of the controller is higher than
the phase or the ground potential of other controllers on the network.
◆
The bulbs protect the controller from damage by limiting the input
signal. If voltage or current exceeds safe operating conditions, the bulbs
will act as fuses and open the connections between the controller and the
network.
◆
By removing the bulbs from their sockets you can isolate the controller
from the associated network.
The illustration
Isolation bulbs
on page 28 locates the isolation bulbs on the LAN
Controller.