Daktronics AB-1600-1.5,2.5 - Manual (Page 26)

3-10 Electrical Installation
3.9 Display Voltage Monitoring
Turn on the power to the display and configure the display to have 50% of the lamps on per
module. This can be done by either:
1. creating a static sequence with alternate columns on, or
2. selecting the sequence from the appropriate controller manual under the
diagnostics section.
Record the readings on both power reports provided in Appendix C. Send one of the
completed power report forms to Daktronics Customer Service and keep one report form for
your own records.
Line and lamp voltage should be monitored every six months or whenever a significant
change occurs in the area which could affect line voltage (e.g., additional business moves into
the area or perhaps the power company installs a new transformer). To alter lamp brightness
and/or lamp life, refer to Section 4.2.
3.9.1 Line Voltage
Take a line voltage reading of all phases with the display running and record the
results. For the phase with the highest reading, record line voltage over a period of
24 hours (minimum).
If there are any reasons to suspect large voltage fluctuations, a recorder should be put
on at least one phase of the power for a period of one week while the display is being
operated normally. Contact Daktronics Customer Service department with respect to
this recording.
If you don’t have the proper equipment to accurately monitor the line voltage, you
may:
Have the local power company take the readings.
Rent the equipment from a local service company.
Have Daktronics customer service recommend the proper equipment.
Rent the equipment from Daktronics.
If the line voltage is above 120 volts, changing the transformer configuration will
increase lamp life. Refer to the lamp life chart in Section 3.7 to determine the
estimated lamp life after determining the lamp voltage from the above voltage
monitoring test.
If the measured input line voltage is over the particular transformer rated input
voltage, increased voltage will be delivered to the lamp which in turn will greatly
reduce lamp life. Connecting the 7V buck winding will reduce lamp voltage and
increase lamp life.
Lamp life of a Marquee-type display is estimated to be 17,000 hours with a line
voltage of 120 volts at the 120 volt tap on the transformer. Lamp life of a Sports-type
display is estimated to be 5,466 hours with a line voltage of 120 volts connected to
the 10V Boost tap on the transformer. Lamp life results will also vary with
programming style and use of dimming mode.