Technical data

7-6
Power Supplies
7
Fast Transient Test
The following power Fast transient pulse parameters, per EN55101-4 does not
adversely affect the power supply’s operation.
Voltage, -/+ 4000 V
tBurst, 15 msec
fBurst, 2.5 KHz
tRep, 300 ms
Injection, Asynchronous, Coupling, On L1, L2 and E
Duration, 1 minute
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 AC 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 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 also
attempts 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.
Table 7-3. 700 Watt AC Power Supply Specifications (Continued)