Electrical
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4 Electrical
The following electrical requirements are required and must be met over the
environmental ranges as defined in Chapter 7
(unless otherwise noted).
4.1 AC Input – REQUIRED
Table 4-1 lists AC input voltage and frequency requirements for continuous operation.
The power supply shall be capable of supplying full-rated output power over two input
voltage ranges rated 90-135 VAC and 180-265 VAC rms nominal. The correct input
range for use in a given environment may be either switch-selectable or auto-ranging.
The power supply shall automatically recover from AC power loss. The power supply
must be able to start up under full loading at 90 VAC.
Note: [OPTIONAL] 115 VAC or 230 VAC only power supplies are an option for specific
geographical or other requirements.
Table 4-1: AC Input Line Requirements
Parameter Minimum Nominal
1
Maximum Unit
Vin (115 VAC) 90 115 135 VAC
rms
Vin (230VAC) 180 230 265 VAC
rms
Vin Frequency 47 - 63 Hz
NOTE:
1. Nominal voltages for test purposes are to be within ±1.0V of nominal.
4.1.1 Input Over Current Protection (Required)
The power supply is required to incorporate primary fusing for input over current
protection to prevent damage to the power supply and meet product safety
requirements. Fuses should be slow-blow-type or equivalent to prevent nuisance trips.
4.1.2 Inrush Current (Required)
Maximum inrush current from power-on (with power-on at any point on the AC sine)
and including, but not limited to, three line cycles, shall be limited to a level below the
surge rating of the AC switch if present, bridge rectifier, and fuse components.
Repetitive ON/OFF cycling of the AC input voltage must not damage the power supply
or cause the input fuse to blow.
4.1.3 Input Under Voltage (Required)
The power supply is required to contain protection circuitry such that the application of
an input voltage below the minimum specified in the Table 4-1, must not cause
damage to the power supply.
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