WFCO WF-9800 Series User Manual
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If the input from shore power is 105 Vac-130 Vac to the receptacle,
check the reverse battery protection fuse on the front plate of the
WF-9800 deckmount converter. Visually inspect the fuses for any
breaks/opens. If the fuses do not appear to be open, use a tester to
check for continuity.
RECEPTACLE
AC OUTPUT
(Power Center)
DC
OUTPUT
Reverse
Battery
Protection
Fuses
M
O
D
E
L
:
W
F
-9
8
X
X
MODEL LABEL
AC INPUT
SHORE POWER
AC OUTPUT
(30 A OR 50 A)
SERIAL LABEL
.
If the reverse polarity fuses are blown, it means the RV battery was
accidentally connected in reverse, either at the battery or at the
converter. Reconnect properly, then replace the fuse with the same
type and amp rating as the original “Littelfuse ” Type 257 automotive-
style fuse.
IMPORTANT: These fuses protect the converter from damage in the
event that the RV battery is accidentally connected in reverse. A reverse
battery connection, even for a second, is the only reason that these fuses
will blow
TM
TM
Converter Operation Modes
All WFCO power converters are automatic three-stage switching
power supplies. The converter senses which mode it needs to be in by
checking the RV system voltage.
The three modes/stages of operation include:
Absorption mode/Normal operation
Nominal battery charge and supplies power to appliances
Bulk mode/Charge mode
Fast battery charge and supplies power to appliances
Float mode/Trickle charge
Trickle battery charge during storage
Absorption Mode: During this mode, the converter output is in the
13.6 Vdc range. This is the normal operation mode. This mode
provides the 12 Vdc and current required by the 12 Vdc RV appliances,
as well as slow charging the battery.
Bulk Mode: In this mode, the output voltage of the converter will
switch to 14.4 Vdc for a maximum of four hours. If the converter
cycles between “Absorption and Bulk mode,” there could be a shorted
battery cell or other issues.
Float Mode: In this mode, the converter is charging the battery with
a trickle voltage of 13.2 Vdc. When the converter senses a demand
(by turning on lights), the converter automatically returns to the
“Absorption mode”.
Ground
FUSE
FUSE
POS
NEG -
+
RED
BLACK
ATC Style
“Littelfuse ” Type 257 fuse
®
Troubleshooting WF-9800 Series Converter
®