Table 1-3 Low-voltage power supply Main DC voltage Sub- voltage Behavior +24V +24VA ● Constantly supplied ● Stopped during Sleep mode +24VB ● Interrupted when the rear door open ● Stopped during Sleep mode +24VC ● Interrupted when the cartridge door open ● Stopped during Sleep mode +3.3V +3.3VA ● Constantly supplied +3.3VB ● Constantly supplied +3.3VC ● Constantly supplied ● Stopped during Sleep mode Table 1-4 Low-voltage power supply functions.
Function Applied Sleep mode V Power supply voltage detection N/A Automatic power OFF V Automatic power ON/OFF N/A Active OFF V Inactive OFF V Network mode N/A Power switch illumination V Low-voltage power supply failure detection V Power save mode N/A Overcurrent/overvoltage protection The low-voltage power supply has a protective function against overcurrent and overvoltage to prevent failures in the power supply circuit. If the DC power is not being supplied from the low-voltage power supply, the protective function might be running. In such case, turn off the power switch and disconnect the power cable.
Do not connect the power cable or turn on the power switch again until the cause is found. If the DC power is not being supplied from the low-voltage power supply, the protective function might be running. In such case, turn off the power switch and disconnect the power cable. Do not connect the power cable or turn on the power switch again until the cause is found. ENWW Engine control system 7