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4.0 Troubleshooting
©2002 Xantrex Technology Inc. All Rights Reserved.
P/N 975-0049-01-01 Rev A 10/2002
Potential Problem Loads for UPS Applications (continued)
General Issues (continued)
Cell Phones
Some cellular telephones experience interference in the
form of a clicking sound.
Consumer Electronics
AM radios, citizen band, amature radio, and wireless
intercom systems tend to pick up inverter noise,
especially on the lower half of their band. Inexpensive
tape recorders are likely to experience noise as well.
Avoid starting large loads when using sensitive electronic
devices.
Waveform Issues
Ceiling Fans
Most large-diameter, slow turning fans run correctly, but
generate more noise than when connected to utility
power. High speed fans tend to operate normally.
Clocks
The unit’s crystal controlled oscillator keeps the
frequency accurate to within a few seconds a day;
however, external loads in the system may alter the unit’s
output waveform causing clocks to run at different
speeds. There may be periods where clocks keep time
correctly and then mysteriously do not. This is because
most clocks do not draw enough power to trigger the load
sensing circuit when in SEARCH mode. In order to
operate, especially with no other loads present, the unit’s
load sensing circuit will have to be defeated (i.e., turn off
the SEARCH Mode).
Dimmer Switches
Most dimmer switches lose their ability to dim the lights
and operate only in the fully ON or OFF position. Newer
dimmer switches controlled by microprocessors tend to
work better in these applications.