10
Operation
Once configured, programmed and powered up, the controller requires very
little user intervention.
Controls and Indicators
The following sections describe the controls and indicators found on the card.
Alternately, you may remove the RS-485 terminal block from the card to isolate
the card from the network without disrupting network communications to other
controllers.
Status LEDs
Two Status LEDs are located on the bottom left side of the controller. They are
used to indicate the following:
Communications
– This yellow LED flashes whenever the controller is commu-
nicating with other controllers over the RS-485 network connection.
Ready
– This green LED indicates the controller has power and is operating
normally. The LED will flash on and off at one second intervals.
Isolation Lamps
Two Isolation Lamps are located below the RJ–12 connector on the right side of
the controller. These lamps serve three functions:
◆
Removing the lamps will open the RS-485 circuit and isolate the controller
from the network.
◆
If one, or both, lamps are lit, it indicates the network is improperly phased.
This means that the ground potential of the controller is not the same as other
controllers on the network
◆
If the voltage or current on the network exceeds safe levels, the lamps operate
as fuses to protect the controller from damage.
Power Jumper
The power jumper, shown in Illustration 8, can be used to remove power from
the controller. This should be done anytime connections are made or changed on
the controller. Removing the jumper opens the 24 VAC supply circuit.
Resetting the Controller
If the controller appears to be operating incorrectly, or is not responding to
commands, you may need to reset the controller.
