Technical data

7-10
Power Supplies
7
Output Power
700 watts total continuous from all outputs. 850 watts, 30 seconds peak for 300 mS at
10% maximum duty cycle
Output Isolation
There is a common +5, -12 and +12 volt return.
Output Noise
Total periodic and random deviation (PARD) noise found on the outputs of the power
supply is a maximum of 100 mV P-P, or 1.0% from 0 to 10 MHz, whichever is less, when
measured with any resistive load within the power supply’s operating range.
Power Fail Signal
This signal is Low True. The Power Fail signal indicates the loss of DC power by
switching to a standard TTL logic low (0) at least 5 milliseconds prior to the loss of
regulation (+5 volt output at least at 4.75 volts) with supply operation at Vac = 90 and
the load = 680 TO 700 watts, or Vac = 178 at the same DC load. It must sink at least
48 mA at no more than 0.6v.
Overload Protection
All DC outputs must have a method to protect the power supply from overloads. The
output attempts to recover when the Enable is cycled Off then On. Cycling of the AC
input Off then On may cause the power supply to attempt recovery. The power supply
may also attempt recovery when the overload condition is removed.
Short Protection
All DC outputs must have a method to protect the power supply from shorts between
the + and - terminals of each output and also protect itself from a short between the +
terminal of the +12v output and the - terminal of the -12v output. The output attempts
to recover when the Enable is cycled Off then On. Cycling of the AC input Off then On
may cause the power supply to attempt recovery. The power supply may also attempt
recovery when the short condition is removed.
AC/DC Power Supply Operation
When one each of an AC input and a DC input supply are installed together, they
operate with the following characteristics.
1). When adding the second power supply to the system, AC or DC, it can be plugged
into a backplane of a running system before the input power cord is attached and not
cause the running power supply to fault.
Table 7-4. 700 Watt DC Power Supply Specifications (Continued)