Lamar Technologies Activator 282 - Manual (Page 9)

8
will reduce from 30 minutes to 15 minutes for a second cycle, and then to
two minutes for subsequent cycles.
If, when switched from ‘Off’ to ‘On’, the battery voltage rises rapidly from its Open
Circuit Voltage (OCV) to a voltage above 28 volts, this high voltage surge may be
due to the battery not accepting charge. With Lead Acid batteries, this indicates
that the battery is sulfated. NiCad batteries may also exhibit this under certain
conditions of corrosion at the cell linkages. When rising to maximum
immediately, the voltage seen is only a “Chemical” voltage.
When this occurs, a sulfated Lead Acid battery requires a Conditioning Charge
and a Nickel Cadmium battery requires service.
(See the BAD-1 Manual referred to in paragraph 1.)
4.0 BATTERY CHARGING PROTECTION
The Activator 282 protects the battery with an over temperature cutout, and a
charge cutout if the voltage does not continue to rise.
4.1 OVER TEMPERATURE CUTOUT
Charging a battery generates heat within the battery. The generation of excess
heat, especially with a low rate charge such as with the Activator 282, is often an
indication of a problem battery. This can include a shorted cell, but can also
occur during a long conditioning charge or if the battery is charged in a high
ambient temperature environment. The heat generated internally is conducted to
the cell interconnections and then to the terminals of the battery.
The Activator 282 has a temperature detector with a heat detecting tab thermally
connected to the Activator 282 quick disconnect receptacle and hence to the
terminal pins of the battery.