PF1350 TECHNICAL MANUAL REV 1 2/06/14
3.2 OPERATING
INSTRUCTIONS
1. Connect the unit to a source of AC power between 90 & 267 Vrms and 47-63Hz.
NOTE: for full power operation, input must be at least 105V
. Conformance with
IEC safety standards limits the input to 250Vac. See section 2 of this manual for
specific wiring information.
2. Set the PF1350 front panel controls as follows:
RANGE =
As
desired
for
load
(Note: button in is high range)
FREQ
=
To desired value of 50, 60, or 400Hz
VOLTS =
Fully
Counter
Clockwise
(CCW)
With loads connected and switched off (recommended), turn on the front panel switch
and allow a few seconds for the power supply to stabilize. Use the VOLTS adjust
controls to set the desired output voltage as indicated on the display.
3. To shut down, turn of front panel power switch.
NOTE: once the unit is switched off, a period of 10 seconds must be allowed before
the unit is switched back on. Failure to do so may cause tripping of upstream circuit
breakers.
It is also possible to have the output voltage set at zero, and then to turn on the load
switch. The voltage can then be increased to the required operating point by adjusting
the VOLTS control clockwise. This method works best with linear loads and may be
desirable for certain applications.
3.3 OPERATING
CONSIDERATIONS
The output voltage and frequency may be varied at any time while the unit is loaded.
It is recommended that the load be disconnected (off) while changing the range setting.
This will prevent potentially damaging transients from reaching the load.
These AC power supply models are based on electronic circuits that utilize various
power semi-conductors. As such, there is a limit to the amount of current that can be
supplied.
Certain loads may draw short duration, very high peak currents that may activate
protection circuits within the AC power supply. The Model PF1350 incorporates two
distinctive over current circuits. The first responds to massive overloads like short
circuits. This circuit can respond in a few tens of microseconds. Once activated, the AC
output of the power supply is disabled and the front panel fault LED is illuminated. To
recover from this type of overload, the input power must be cycled off for about 30
seconds.
