17
TT-855 12/93
Standard Accessories
Standard Accessories
Current Limiting
The charger is protected from overload by its
current-limiting circuitry. This circuitry continuously
monitors the charger output current and is set to limit the
current to 2 amps from full load to short circuit.
Therefore, no crank disconnect is required when the
plant is exercised.
Reverse Polarity Protection
When the charger is connected to the battery, the
reverse polarity protection circuit determines if the
connection is of the proper polarity. If the polarity is
incorrect, the charger will not turn on when AC input is
connected.
Automatic Float Operation
When the charger is properly connected to the battery
and AC power is applied to the charger, the charger
operates in the constant-current mode until the battery
voltage rises to the preset float level. At the preset float
level, the charger will switch to the constant-voltage
float mode. The charger will operate in constant-voltage
float mode until AC input power is lost or the current
required to maintain the battery at the float voltage
setting exceeds 2 amps.
Temperature Compensation
The charger will provide temperature compensation of
–2 mV/
_
C per cell over the ambient temperature range
of –40
_
C (–40
_
F) to +60
_
C (+140
_
F). This feature will
automatically adjust the float voltage setting to prevent
the battery from being overcharged at high ambient
temperatures and undercharged at low ambient
temperatures.
AC Input Fuse
When AC input is applied, the AC input fuse will open to
protect the power transformer from damage due to a
short circuit condition. The fuse may also open if
subjected to vibration for an extended period of time.
Replace the fuse to return the charger to operation. See
charts in “Specifications” section for fuse value.
DC Output Fuse
The DC output fuse will open and protect the power
transformer from damage if the current limit setting has
been disabled or set to its maximum. It will also open if
the charger output leads are shorted together for an
extended period of time.
Power On Lamp
The Power On lamp is connected across the power
transformer’s primary winding and indicates when AC
power is present.
