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ROC800-Series Instruction Manual
3-30
Power Connections
Revised Jul-14
Battery Reserve
Battery reserve is the amount of time that the batteries can provide
power without discharging below 20% of their total output capacity.
The battery reserve should be a minimum of five days, with ten days
of reserve preferred. Add 24 hours of reserve capacity to allow for
overnight discharge. Space limitations, cost, and output are all factors
that determine the actual amount of battery capacity available.
To determine the system capacity requirements, multiply the system
current load on the batteries by the amount of reserve time required, as
shown in the following equation:
System Requirement = Current Load in Amps * Reserve Hours = _____ Amp Hours
Caution
When using batteries, apply in-line fusing to avoid damaging the
ROC800.
To make battery connections:
1.
Perform the backup procedure described in
Preserving
Configuration and Log Data
in
Chapter 6, Troubleshooting
.
2.
Remove the BAT+ and BAT– terminal block connector from the
socket.
3.
Install a fuse at the input power source.
4.
Insert each bared wire end into the clamp beneath the BAT+ and
BAT– termination screws (refer to
Figure 3-5
).
5.
Screw each wire into the terminal block.
6.
Review
Restarting the ROC800
in
Chapter 6, Troubleshooting
.
7.
Re-apply power to the ROC800.
Note
:
Refer to
Table 3-2
concerning LEDs.
3.5.3 Replacing the Internal Battery
The internal Sanyo 3 volt CR2430 lithium backup battery located on the
CPU provides backup of the data and the Real-Time Clock when the
main power is not connected. The battery has a one-year minimum
backup life while the battery is installed and no power is applied to the
ROC800. The battery has a ten-year backup life while the backup
battery is installed and power is applied to ROC800 or when the battery
is removed from the ROC800.
Recommended replacement lithium/manganese dioxide batteries
include:
Table 3-23. Replacement Battery Types
Part
Battery, Lithium, 3V
Size
24 mm (0.94 in) diameter x 3 mm (0.12 in) height