Mitsubishi Q172CPU User Manual page 54

2 SYSTEM CONFIGURATION
Internal rechargeable
battery
(7) Selection of Q172EX, Q173PX
Item
Q173CPU(N)
Q172CPU(N)
Module selection
(8) Q173CPU(N)/Q172CPU(N) internal rechargeable battery
• Initial charging of the Q173CPU(N)/Q172CPU(N)
Turn on the power supply and charge the internal rechargeable battery for
eight hours or more, before starting to use the Q173CPU(N)/Q172CPU(N).
It is possible to provide backup power for the IC-RAM memory for at least
200 hours by charging the internal rechargeable battery for eight hours or
more, even if it is empty.
If the battery is charged for five days while applying power eight hours a
day, i.e., 40 hours of normal operation, it will be able to provide backup
power for the IC-RAM memory for 1100 hours.
Battery backup by the external battery will be necessary if there is a
possibility that a continuous power off that lasts longer than the continuous
power failure hours for the internal rechargeable battery specified in the
table below may occur, for example when transporting the system on a
ship.
Item
Charging time: 8 hours or more
(Note)
Charging time: 40 hours or more
Synchronous encoder
Serial absolute Incremental
12 modules
8 modules
Q172EX
Guaranteed time (MIN)
2 - 35
Manual pulse generator
3 modules
Q173PX
Continuous power failure time [h]
Actual time (TYP)
200
1100
500
4300