Lighting Controls Blue Box LT Series Installation, Operation & Maintenance Manual page 62

62
HARDWARE TROUBLESHOOTING (Continued)
2 . If address is displayed, a problem exists somewhere
along the bus .
• Troubleshoot the bus using the "Bus splitting tech-
nique" for a powered bus – refer to the "System
Diagnostics Tools" section of the O&M
• If a "0" is displayed, address the card using the
"AUTO-ADDRESSING" screen and define it in
the "Bus Map" screen
3 . If unable to read the address,
and read address again .
• If address is displayed, a problem exists some-
where along the bus
• If a "0" is displayed, address the card through the
"AUTO-ADDRESSING" screen and define it in
the "Bus Map" screen
• If address is not displayed still, control card needs
to be replaced; contact LC&D for a replacement .
DTC TROUBLESHOOTING
If the DTC shows no display, follow the steps below:
Check for power to the DTC .
4 . Vary contrast to the darkest setting .
• Open low-voltage panel door . On the back of the
display clock, the "contrast" dial can be used to
vary the display contrast
• Using a small Phillips screw driver to turn the con-
trast dial:
- Clockwise to turn up the contrast
- Counter-clockwise to turn down the contrast
5 . Power cycle the DTC .
• Disconnect the clock cable on the back side of the
clock display that connects to the control card
• Re-connect cables and wait for a few seconds for
the clock display to show up
6 . Disconnect master panel from the bus:
• Disconnect both Cat . 5 cables connected to the
master panel and wait for a few seconds
• If the display shows up, the problem on the bus
exists with the Cat . 5 cabling
THE BLUE BOX LT HARDWARE TROUBLESHOOTING
power cycle the card
7 . Replace clock cable with a new one
• Disconnect clock cable
• Replace with a new cable and wait a few seconds
for display to show up
8 . If replacing the clock cable does not fix the problem,
DTC needs to be replaced; contact LC&D for a re-
placement .
If the DTC displays the message: "Upload in Progress, " the
clock is either in the middle of a software upgrade or it
was interrupted and got stuck . The fix to this problem is
to re-upload the DTC software, if this does not correct
the problem, the DTC will need to be replaced . Contact
LC&D for a replacement .
TRANSFORMER TROUBLESHOOTING
The transformer should have 120/277 V ac on the prima-
ry side and the secondary side should have 20 V between
the two outer terminals and 10 V between the center and
either outer terminal .
1 . If the voltage on the primary side is not 120/277 Vac,
• Check to see if the breaker is in the ON position
and that there is voltage from the breaker to the
transformer
2 . If the voltage on the primary side is correct (120/277
Vac) and any of the devices in the panel are not re-
ceiving appropriate voltage:
• Check the voltage on the secondary side terminals
3 . If there is a 120/227 Vac supply from the breaker to
the transformer, but not sufficient or steady voltage
supply on the secondary side:
• Transformer needs to be replaced: contact LC&D
for a replacement .