Rockwell Automation 1756-SPESMNRMXT GuardLogix Controllers User Manual - Manuel (Page 143)

Rockwell Automation Publication 1756-UM020I-EN-P - August 2012 143
Appendix
B
Maintain the Battery
GuardLogix 1756-L6 xS primary controllers and 1756-LSP safety partners
contain a lithium battery which may need to be replaced. GuardLogix 1756-L7 xS
controllers and 1756-L7SP safety partners do not have a battery.
Estimate Battery Life Battery life is dependent upon chassis temperature, project size, and how often
you cycle power to the controller. Battery life is not dependent upon whether or
not the controller has power.
Before BAT Indicator Turns On
Use this table to estimate the worst case time before the BAT indicator turns red.
Topic Page
Estimate Battery Life 143
When to Replace the Battery 145
Replace the Battery 145
Store Replacement Batteries 147
Table 52 - Battery Indicator Estimate (worst-case)
Temperature 2.54 cm
(1 in.) Below Chassis
Power Cycles per
Day
Project Size
1 MB 2 MB 4 MB 8 MB
0…40 °C (32…104 °F)
3 3 years 3 years 26 months 20 months
2 or less 3 years 3 years 3 years 31 months
41…45 °C (105…113 °F)
3 2 years 2 years 2 years 20 months
2 or less 2 years 2 years 2 years 2 years
46…50 °C (114…122 °F) 3 or less 16 months 16 months 16 months 16 months
51…55 °C (123…131 °F) 3 or less 11 months 11 months 11 months 11 months
56…60 °C (132…140 °F) 3 or less 8 months 8 months 8 months 8 months
EXAMPLE Under the following conditions, the battery will last at least 20 months
before the BAT indicator turns red:
• Maximum temperature 2.54 cm (1 in.) below the chassis is 45 °C
(113 °F).
• Power is cycled three times per day.
• The controller contains a 8 MB project.