Komatsu PC490-11, Инструкция по установке и эксплуатации

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REMARK
• When engine starting switch (1) is turned to OFF (A)
position, the engine stops, but the machine's main
power supply is not turned off immediately.
This is a time lag provided for the controller to memo-
rize the operation status and then terminate the sys-
tem. While this process continues, the main power is
maintained. The power holding time varies depending
on the operation condition.
• Also when the cooling fan is used for a cleaning pur-
pose, the machine's main power supply is not turned
off immediately, even if engine starting switch (1) is
turned to OFF (A) position.
This time lag is provided to protect the hydraulic cir-
cuit, and in this case, the machine's main power is
maintained for 7 seconds.
• If the starting switch key is turned to OFF (A) position
while the engine is still hot, guidance (2) may be dis-
played on the machine monitor. To cool down the en-
gine before stopping, run it at low idle for approximate-
ly 5 minutes, because it may cause damage to the de-
vices.
• After the engine is stopped, DEF in DEF injector and
pump is automatically purged and returned to the tank
to prevent malfunction of the devices caused by freez-
ing of DEF or deposition of urea.
For this reason, the device operates for a few minutes
even after the starting switch key is turned off, but this
is not an abnormality.
Do not turn OFF the battery disconnect switch while
the devices are operating to purge. After the purge is
completed, the devices stop automatically.
MACHINE OPERATIONS AND CONTROLS OPERATION
3-188