Document
: LH-A136-15-OB-OPM-DR-1.00
Page 23 of 37
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3.2
Electrical
The power distribution system used must provide adequate protection against excess line current and leakage
currents to earth.
Electrical Characteristics for ONE A136-15-OB
At 100V AC Input
At 240V AC Input
Parameter
Unit
Rating
nom.
Max.
Parameter
Unit
Rating
nom.
Max.
Input current
A
12
30
Input current
A
5.00
12.5
Input freq.
Hz
50 – 60
65
Input freq.
Hz
50 – 60
65
Power
W
1200
3000
Power
W
1200
3000
3.2.1 Circuit Protection
Each section of the screen should be protected by a Circuit Breaker to protect against high fault currents, and a
Residual Current Device (RCD) to detect earth leakage currents.
3.2.2 Earth Leakage Considerations
Each panel of the system has earth leakage current contributions from ten switched-mode power supplies and one
SCHAFFNER/RFI filter. The total earth leakage current per panel can be up to 5.75mA at 240V. If a 30mA RCD is
used, then the maximum number of panels per section should be safely limited to 5.
3.2.3 Inrush-current and Over-current Considerations
The inrush current of the switched mode power supplies used to provide LED and logic power to each panel is
specified by the manufacturer as 97.5A at 115volts and 195A at 230volts for duration of 3ms. However, maximum
current in the steady-state for a panel is considerably less: 12.5A at 240 volts and 30A at 100 volts. The circuit
breaker used to control a section of the screen must be able to handle the short-term inrush current at switch-on,
without causing unnecessary disconnection of the supply, and be able to detect excess currents due to faults within
the equipment, during normal operation.
3.2.4 Earthing
Each panel is separately connected to the AC power distribution system’s earth through the appliance coupler. All
exposed panel metalwork (main frame) is also connected to this earth.
If the framework is earthed only through each panel (i.e. through the panel’s mounting bolts), there is a possibility of
electrical damage if a wiring fault occurs, or if an electrical discharge, such as lightning strike, hits the panels. Under
these circumstances, the current discharge path will be through the panel to earth rather than through the framework
to earth. When permanently installed on a metal framework, the framework itself should be directly connected to
earth also.
3.2.5 EMC Statement
Installations should be located at least 30 meters from other sensitive systems or installations and if situated in close
proximity to a roadway it may create interference to vehicle radio communications.
3.2.6 FCC Statement
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to
radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own expense.
*Note: Modifications not authorized by the manufacturer may void users authority to operate this device.
