Daktronics AB-1600-1.5,2.5 - Manual (Page 28)

Electrical Installation 3-4
3.3 Checking Line Voltage & 24-Hour Voltage Monitoring
Prior to display installation a two-part voltage check should be performed. This is a necessary step
taken to maximize lamp life. By looking-up the line voltage on the table in this sub-section, estimated
lamp life may be calculated and, if necessary, steps can be taken to extend it.
In Appendix C are two forms titled “Display Power Report.” Three different voltage readings are
recorded on this form.
1. Line voltage, which is addressed in this sub-section.
2. 24-hour monitoring, which also is addressed in this sub-section
3. Lamp voltage, which is checked after the display is powered-up for the first time.
When complete, one of the “Display Power Report” forms must be sent to Daktronics Customer
Service. The other form is for the customer’s records.
To complete the line voltage check, take a line reading of each phase and record the results on each of
the power reports in Appendix C. Then place a voltage monitor on the phase with the highest reading
for 24 hours. The maximum and minimum voltages recorded should also be recorded on each of the
power reports.
If lacking the proper equipment to accurately monitor line voltage consider the following options.
•
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 there is any reason to suspect large voltage fluctuations, place a recorder on the line for on at least
one phase of the power for one week while the display is being operated normally. Contact Daktronics
Customer Service with respect to this recording.
Display brightness and lamp life are generally determined assuming an average incoming line voltage of
230 volts AC at 60 hertz. If the line voltage varies from that value, both lamp life and brightness will be
affected. Lamp life results will also vary with programming style and use of dimming mode.
Á Lamp life predictions are for lamps operating in a laboratory with continuous operation in a
stable temperature and mechanical environment. Actual values will differ from predicted life
because of switched operation, varying temperature, mechanical vibrations due to wind, traffic
and sign service and actual hours of operation. Data is that of the manufacturer.