Capítulo 3: Mantenimiento Centrado en la Fiabilidad (Reliability Centred Maintenance, RCM) Centred Maintenance, RCM)
3.2. Mantenimiento y RCM
Support
The battery system on Vx610 (supporting a battery capacity of 1800 mAH) keeps track of the remaining charge in the battery by communicating with the battery monitor chip and reading the charge register. The cells come out of the factory about 30% - 50% charged, and they are then assembled into the battery pack together with the monitor chip. The monitor chip does not read the status of the battery’s charge. Battery conditioning also calibrates the monitor chip.
The battery conditioner calibrates the monitor chip by putting the battery pack into a known state, fully charged as determined by a charging current less than .1c with the battery voltage greater than 8.0 volts. The conditioner sets the current monitor register to the largest value and then it discharges the battery. When the
APPLICATION PROGRAMMING ENVIRONMENT
System Mode Battery Support
battery is fully discharged, determined by the battery voltage falling below 6.0 volts, the conditioner then clears the charge counter and fully charges the battery.
When the battery is fully charged as determined by the conditions above, the conditioning cycle ends and the terminal returns the battery status screen.
On Vx670 terminal, the DS2438 Smart Battery Monitor automatically keeps track of the amount of current entering and leaving (charging and discharging) the battery cells. It is capable of measuring and keeping track of total charging and discharging current, as well as instantaneous current. These values are kept in EEPROM registers in the DS2438 chip and are available to the OS. The ISL6253 battery charger automatically charges the battery. The charger chip is enabled when the battery voltage falls below 8.0 volts and disabled when the charging current falls below 40 mA.
Without the battery pack, the printer cannot be used even if it is connected to AC power. Removing the battery pack while printing and connected to AC power causes a printer mechanism error. Refer to Printer, Battery, and Radio Interaction for more information.
The System Mode Battery Support menus are listed in Table 12:
NOTE The Vx810 and the Vx700 units do not operate from a battery and must be connected to an external power source to operate. The battery status is removed from the System Mode menus.
Table 12 System Mode Battery Support
Display Action
At startup, the terminal displays a copyright notice screen that shows the terminal model number, the version of the Vx5xx/Vx6xx system firmware stored in the terminal’s flash memory, the date the firmware was loaded into the terminal, the copyright notice, and the battery status.
This screen appears for three seconds, during which time you can enter system mode by simultaneously pressing F2 and F4.
To get battery status menu from the System VERIFONE OMNI
System Mode Battery Support
Battery Conditioner
The cells and a monitor chip are then assembled into the battery pack. The monitor chip does not know how charged the battery is. The battery conditioner calibrates the monitor chip by putting the battery pack into a known state, fully charged as determined by a battery voltage greater than 8.0 volts and a charging current less than 40mA for over 1 minute. The conditioner then sets the current monitor register to the largest value and discharges the battery. When the battery is fully discharged, determined by the battery voltage falling below 6.5 Volts, the conditioner reads the amount of current discharged and calls that value as full charge capacity. The conditioner then clears the charge counter and fully charges the battery. When the battery is fully charged as determined by the conditions above, the conditioning cycle ends and the terminal will return to the battery status screen.
This screen shows the status of the battery.
To initiate the battery conditioner/cycler/caliber, press F4.
The battery conditioner will check if the terminal is powered by the external power pack. If the power pack is not attached, System Mode will report an error. System Mode will charge, discharge, and then charge the battery again.
During this process, the battery hardware charge counter will be calibrated; the battery’s full capacity will be determined and saved.
Note: For Vx670 terminals, you will also see the information SN and INITIALIZED.
This screen is displayed during the battery conditioning.
The line in column 1 of row 3 rotates to show that the system is still active and operating.
Pressing the CANCEL key will abort the conditioning and return to the battery status screen.
Table 12 System Mode Battery Support (continued)
Display Action
APPLICATION PROGRAMMING ENVIRONMENT
Timers
The battery initializer, initializes the full charge and remaining charge registers the battery pack. It does it by constantly monitoring the battery charging current.
When the initializer detects that the battery charger chip has stopped charging the battery, it checks the battery’s full charge register. If the value in the full charge register is less than 1700, the initializer sets the full charge register to 1700;
otherwise, the initializer does not change the full charge register. Then the initializer writes the full charge register value into the remaining charge register.
Timers
Timers are hardware (and “soft”) devices that can generate interrupts for driving the background processes of device drivers. In Verix V, timers are used to provide COM port baud clocks and schedule interval-timed background processing.Timers