Orion System SA E-BUS Controller - Manual (Page 54)

Zone
Zone
Troubleshooting
SA E-BUS Controller Technical Guide 54
Using LEDs To Verify Operation
The SA E-BUS Controller is equipped with 4 LEDs that can be used as
very powerful troubleshooting tools. See Figure 31 below for the LED
locations. The LEDs and their uses are as follows:
REC
- This LED will light up to indicate system communications.
POWER
- This LED will light up to indicate that 24 VAC power has
been applied to the controller.
STATUS 1 - This is the diagnostic blink code LED. It will light up
and blink out diagnostic codes. STATUS 1 LED also represents the tens
column in the address blink code.
STATUS 2
- This is the diagnostic blink code LED. It will light up and
blink out diagnostic codes. STATUS 2 LED also represents the ones
column in the address blink code.
POWER LED Operations
When the SA E-BUS Controller is powered up, the POWER LED should
light up and stay on continuously. If it does not light up, check to be
sure that you have 24 VAC connected to the controller, that the wiring
connections are tight, and that they are wired for the correct polarity. The
24 VAC power must be connected so that all ground wires remain com-
mon. If after making all these checks, the POWER LED does not light
up, please contact WattMaster Controls Technical Support for assistance.
REC LED Operations
When power is applied to the controller, the REC LED will also light
up. If this is a Stand Alone System (one controller only on the loop) or
an Interconnected System (several SA E-BUS Controllers tied together
without a CommLink), the REC LED will glow continuously. The REC
LED will fl icker when you are connected to the SA E-BUS Controller
and you are entering setpoints with the Modular Service Tool or one of
the System Managers. It will also fl icker if this is a Networked System.
If this is a Networked System (the system has a CommLink installed),
the REC LED should fl icker rapidly, indicating that the system is com-
municating. A “fl icker” is defi ned as a brief moment when the LED
turns off and then back on. It may be easier to see this “fl icker” if you
cup your hand around the LED.
If the REC LED does not operate as indicated above, fi rst check the
address switch setting. Verify the address switch as outlined in the Di-
agnostic LEDs Operations section on page 55. See Figure 29 on page
36 for complete address switch setting instructions.
NOTE: STATUS 1 LED represents the tens position and STATUS
2 LED represents the ones position of the controller address. If the
address of the controller is set to 59 with the address switch, fi rst
STATUS 1 LED will blink 5 times, and then STATUS 2 LED will
blink 9 times.
If the address switch setting is correct and the REC LED still does not
behave as indicated above, check to be sure the operator’s interface is
connected correctly. If you are using the Modular Service Tool, verify
that it is plugged in securely to the DIN connection on the SA E-BUS
Controller. If you are using one of the System Manager Operator’s
Interfaces, see the SA E-BUS Controller Operator Interfaces Technical
Guide or the System Manager TS Operator Interfaces Technical Guide
for a connection diagram.
If the REC LED still does not behave correctly, check the voltages at
the communications terminal block. Be sure the Controller is powered
up for this test. Unplug the communications terminal block from the
controller and check the DC voltage between T and SHLD and between
R and SHLD. Check the voltage with a digital multimeter set to DC
volts. The voltage should be between 3.0 to 3.2 VDC between SHLD
and either T or R. If the voltage is not in this range, you probably have
a damaged driver chip that must be replaced.
For driver chip replacement instructions, please see the Orion Controls
SA E-BUS Controller Component & System Wiring Technical Guide for
more information or contact the factory for further assistance.
LED Diagnostics
Figure 31: SA E-BUS Controller Diagnostic LED Locations