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Operating instructions

ManualsBrandsAnalytic Systems ManualsConsumer electronicsPWS120
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Troubleshooting
(General)
PROBLEM: ON/OFF switch does not illuminate when turned on.
Probable Cause Suggested Remedy
No AC power available. Check AC outlet for power.
AC input fuse is blown. Replace the fuse with a fuse of the correct rating.
PROBLEM: AC input fuse blows as soon as power is turned on
Probable Cause Suggested Remedy
Input voltage is low Check input voltage
The unit is in current limit due to a large reactive
load or the output terminals are shorted together
Check that the output terminals are not shorted together.
Remove the load and check the output voltage. If it is normal,
then the load is too much for the power supply.
PROBLEM: The output voltage drops as soon as the load is applied.
Probable Cause Suggested Remedy
The unit is going into current limit. Reduce the load current to less than the rated current limit.
Devices such as motors, compressors, relays and lamps can have
high inrush or starting currents. Please ensure these currents do
not exceed the current limit rating of the power supply.
The unit (PWS240) is shut down due to over temp Check that the fan has not failed or the vent openings are not
blocked.
DEFECTS OR DAMAGE
If after checking all of the above and the problem persists, you may assume the unit is defec-
tive or damaged and it must be returned for repair.
WHEN USING THE POWER SUPPLY WITH RADIO TRANSCEIVERS
• This power supply generates, uses and can radiate RF energy as per limits laid down
under class “B”, Part 15 of FCC rules. Position the radio, antenna and power supply
to minimize any received spurious noise from the power supply and excess RF energy
from the transmitter. Ideally, for a 100 watt HF installation, the antenna should be
at least 40 to 50 feet from the power supply to eliminate the effects of transmitter
energy on the power supply and induced noise from the power supply to the receiver.
• If the supply fails to turn on, check that the transceiver is off. The supply may turn
on with a lower load (transceiver in the receive mode) but may not turn on if the