Adaptive AlphaXpress 2020, Operation And Maintenance Manual

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1-4 A
LPHA
X
PRESS
2020 RGB F
RONT
A
CCESS
F
ULL
-M
ATRIX
D
ISPLAYS
S
IGN
O
PERATION AND
M
AINTENANCE
M
ANUAL
(PN 1523610201
REV
.
B
)
Introduction
S
YSTEM OVERVIEW
1
Environmental control system
To protect the sign components from overheating, two or three fans are mounted in each of the sign's modular cases. A thermostat
dedicated to each fan controls the operation of each fan independently.
• Internal circulating fan - The internal circulating fan(s) turns on when the internal temperature of the sign reaches
43°C (+/- 4.5°C) 110°F), and turns off when the internal temperature falls below 27°C (+/- 5C°) 80°F).
• External air ventilation housing fan - The external air ventilation housing fan turns on when the internal temperature of the sign
reaches 54°C (+/- 4°C) 130°F), and turns off when the internal temperature falls below 38°C (+/- 5°C) 100°F).
Electrical system
The electrical supply system is responsible for supplying the necessary power to operate the LED sign system. The sign housing AC
and DC electrical system consists of the following components:
• DC power supply
• Thermostat controlled AC fans
Electrical distribution (DC)
Attached to the back panels in the sign housings are the power supply plates containing two 24VDC switching redundant power
sharing supplies. The electronic power supplies convert the 120VAC to the required DC voltage to power all of the electronics in the
sign. DC power to the electronics is redundant and has a primary and secondary source of DC power. Therefore, failure of a single
power supply will not impact sign performance. The controller monitors the status of the power supplies.
Electrical distribution (AC)
The AC input to the sign system consists of 120VAC (see the sales drawings) single-phase service wired to the input AC terminal block
located on the controller plate. AC is internally wired to the DC power supplies and fans. AC power to the power supplies and fans is
controlled by 20 Amp circuit breakers. The quantity of breakers is dependent on the size of the sign.
Depending on the sign size there may be more than one AC power entry. Reference the sales drawing for specifics. Contact Adaptive
support if required.
WARNING
Hazardous voltage. Multiple power sources may be present. Risk of electrical
shock. Disconnect all power sources before servicing.
Power supply plate
Sign controller
plate
AC distribution plate
Customer AC
connection
Power supply plate
Power supply plate
I/O plate
Circulating
fan
Front filter
access
Venting
fan