Ocs Battery Charging Cycle - HORNER APG XL10 PRIME OCS User Manual

21.5 OCS Battery Charging Cycle

There are various charging states that are executed based on battery temperature, level of battery
charge, and self-test results. The battery temperature can be determined by checking the CPU
temperature in the controller System Menu: View Battery Status or by monitoring System Register
%SR195.
The battery temperature is equal to the CPU temperature minus 30°C.
NOTE: Refer to Table 20.1 for charge states and definitions.
1. When power is applied to the OCS, the unit always goes to State 11; Waiting, for the first
two minutes.
2. After two minutes have expired, the OCS will begin charging the battery based on battery
temperature. In this step, charging will ensue even if the battery is already fully charged.
In this step charging does not ensue if the battery temperature is outside of the acceptable
hot or cold limits.
3. The battery is charged fully to 4.2 volts in the Normal Charging or Cold Charging states or to
4.1 volts in the Hot Charging state.
4. Once fully charged to 4.2 volts, state 0, the Wait Discharging state is executed, state 12. The
battery is allowed to discharge to 4.0 volts for however long that takes. Powering up the
OCS will reset the charge cycle to step 1.
5. If the battery was charged to 4.1 volts under state 2, Hot Charging; 4.1 volts is maintained
until Normal or Cold Charging can be executed.
Note: If the battery voltage is too low, less than 2.5 volts, or if the battery is missing, charging is
suspended. In this condition, the OCS unit fails self-test. Diagnostics will show a battery
warning. %SR55.13 will be ON.
Note: If the battery is not missing and the voltage is 2.5 volts or greater but will not fully charge in 8
to 40 hours, the charge cycle is suspended for 5 minutes and then tried again.
Note: Because the OCS is designed to maintain the Real Time Clock for a year or more in a powered
down state, this translates as; the battery requires up to 8 to 40 hours of recharging time in a
year.
J u l y 6 , 2 0 2 2
MAN1029-10-EN_EXL10_XL10P_UM
P a g e 175 | 195