7
AUTOMATIC COOLING FAN
The cooling fan in the WF-9800-AD Series Converter-Chargers is incremental and is controlled
by the current drawn out of the converter to the applied load. The on-board microprocessor
increases fan speed as the total load increases and decreases fan speed as the load decreases.
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Unlike traditional temperature-controlled fans, the load-controlled fan provides better
component cooling by avoiding temperature spikes which can lead to premature
component failure.
OVER-TEMPERATURE PROTECTION
If the internal temperature of the converter exceeds a critical point, it will shut down. This
protects the unit from excessive heat that may damage sensitive components. The unit will
restart once the temperature inside has dropped.
ELECTRONIC CURRENT LIMITING
In the event that the output current exceeds the maximum rating for the WF-9800-AD Series
Converter-Charger, the output current will remain constant, but the output voltage will begin to
drop. If this occurs, the unit will recover once loads are reduced.
SHORT-CIRCUIT PROTECTION
Should a short circuit occur in the RV, the WF-9800-AD Series Converter-Charger will drop the
voltage output to zero volts. If the short-circuit condition is removed and no other fault conditions
are detected, the converter will resume normal operation. However, short- circuit conditions are
dangerous, and an RV will require inspection by a qualied service technician.
DC FUSES (12 VOLTS)
The DC fuse receptacle on the rear panel of the WF-9800-AD Series Converter-Charger has
space for one or two Reverse Battery Protection fuses (see Figure 2 above). These fuses should
be replaced with ATC or ATO automotive type fuses, such as Littelfuse type 257 or Bussmann
type ATC. Each converter model requires a different Amperage value fuse as follows:
• WF-9835-AD – (1) 40A
• WF-9845-AD – (2) 30A
• WF-9855-AD – (2) 35A
Figure 2
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