Numatic TTB 4055/100T Owner's Instructions Manual page 44

Signal (LED)
Red LED on
Yellow LED on
Green LED on
Red LED flashing
Under abnormal use:
i.e. leaving the machine without charging for a period of time - we advise that you follow these steps:
Batteries should be recharged every three months. Charge fully the day before you start using the machine again.
Hour Meter
53
First phase (constant current mode)
Second phase (constant voltage mode)
Third phase (constant voltage mode) charge completed
Charging System Error
Unsuitable battery or charging malfunction safety timer exceeded
Internal short circuit, disconnect from power supply
If fuse requires replacing use only Numatic approved part
(221107). 50 Amp fuse.
If the machine will be standing unused for a period of 30 days
or more, then batteries must be fully charged and battery fuse
removed using the Maxi fuse-puller provided, prior to this
period.
Note:
Fitted to the TTB Range is an hour meter allowing you to
monitor the usage of your machine and batteries (Fig.53).
Hour meter provides brush run-time only.
44
Meaning