EnForcer™ SCR
Service Manual
I.B. 1561
24
CAUTION: To prevent arcing and burning at the connector or a possible battery explosion, press the
START/STOP pushbutton first to stop the charge cycle before removing a battery that is currently on charge.
WATCHDOG CIRCUITS
There are two watchdog circuits on the Enforcer SCR control board – the Override Watchdog and the Reset Watchdog.
Each has an associated orange LED, located on the bottom half of the right edge of the board. The LEDs can be readily
observed by opening the door and looking at the board edge on. The status of the Override Watchdog is indicated by
LED1 – the upper LED; the status of the Rest Watchdog is indicated by LED2 – the lower LED.
OPERATION OF RESET WATCHDOG AND OVERRIDE WATCHDOG
OVERRIDE WATCHDOG
The Override Watchdog monitors the operation of the charge cycle and the Start/Stop pushbuttons and overrides the
main microprocessor if a fault condition is detected. The SCRs are turned off and held off when an override occurs.
NORMAL OPERATION
LED1 flashes once a second to indicate that the microprocessor is operating correctly.
FAULT INDICATION
LED1 flashes at 6-8 times per second to indicate that a fault has been detected.
CONDITIONS THAT CAUSE FAULTS
Total charge time: If the charge time exceeds 19 hours (this includes successive refresh cycles), the Override Watchdog
will operate.
Start / Stop button: If the Start/Stop button is pressed while the charger is charging and the main microcontroller does not
shut off the output within ½ second, the Override Watchdog will operate.
Note that when the Override Watchdog operates, the main processor may still attempt to start a charge cycle. Since the
SCRs are held off, a “DC fuse” error will eventually result. Continuous “DC fuse” faults are sometimes an indicator of an
Override Watchdog operation.
FAULT RECOVERY
The only way to recover from any override watchdog fault is to cycle control board power.
Please note: If a battery has been connected to a charger for a long period after the charge cycle has completed, the
successive refresh cycles may cause the 19 hour charge time limit to expire. The Override Watchdog will operate and
prevent the main processor from starting a charge cycle. A “DC fuse” fault will result.
RESET WATCHDOG
The Reset Watchdog will reset the main processor in the event of a processor fail or lock-up.
NORMAL OPERATION
LED2 flashes every second for 2 minutes after control board power up. The Reset Watchdog is not enabled during this 2
minute start-up. After two minutes, LED2 stays on steady. The Reset Watchdog is now monitoring the main processor.
For normal operation, LED2 will remain on steady.
FAULT INDICATION
If the main processor locks-up or does not operate as expected, the Reset Watchdog will reset the main processor after
an 8 second delay. The control board will re-boot and resume normal operation. If a battery is connected to the charger,
the control board will go into random delay before starting the charge cycle. LED2 will flash every 4 seconds indicating a
Reset has occurred since the last control board power up.
Содержание Millennium-E
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Страница 156: ...EnForcer SCR Service Manual I B 1561 42 SCHEMATIC DIAGRAM ES3 ...
Страница 157: ...EnForcer SCR Service Manual I B 1561 43 ES3 ASSEMBLY DRAWING ...
Страница 159: ...EnForcer SCR Service Manual I B 1561 45 INTERIOR VIEWS ...
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