Rockwell Automation 1794-L34 FlexLogix Controller System User Manual - Manual (Page 98)

Publication 1794-UM001G-EN-P - January 2007
98 Maintain the Battery
Estimating Battery Life When the battery is about 95 percent discharged, the controller
provides the following warnings:
• On the front of the controller, the BATTERY LED turns on
(solid red).
• A minor fault occurs (type 10, code 10).
To prevent the battery from leaking potentially dangerous chemicals,
replace the battery at least as often as:
To estimate how long the battery will support the memory of
the controller:
1. Determine the temperature (° C) 1 in. below the
FlexLogix controller.
2. Determine the percentage of time that the controller is
powered off per week.
ATTENTION
To prevent possible battery leakage, even if the BATTERY LED is
off, replace the battery according to this schedule:
EXAMPLE
If a controller is off:
• 8 hr/day during a 5-day work week
• all day Saturday and Sunday
Then the controller is off 52% of the time:
1. total hours per week = 7 x 24 = 168 hours
2. total off hours per week = (5 days x 8 hrs/day)
+ Saturday + Sunday = 88 hours
3. percentage off time = 88/168 = 52%
If the temperature 1 in.
below the controller is: Replace the battery within:
0° to 35° C No required replacement
36° to 40° C 3 years
41° to 45° C 2 years
46° to 50° C 16 months
51° to 55° C 11 months
56° to 60° C 8 months