Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual 217
May 2019
Battery Installation/Replacement
Advisory Regarding Battery Installation
Memory for the CPU in the Controller Module includes:
Volatile memory (SDRAM) and
Non-volatile memory (Flash)
Only volatile memory requires battery backup.
Care during Installation
HC900 controller comes with an insulator tab which keeps the front battery disconnected from the
controller during the transportation. User should not remove the insulator tab and install the rear battery
until controller is powered and initialized providing Red Flash count. If this is not followed during
installation, significantly higher current drawn will occur to the batteries (40 mA) and this will greatly
reduce battery life.
Once volatile memory is initialized, in the absence line power the SDRAM draws low current from
batteries ~86 uA.
Below table provides details of current drawn from batteries by different variants of HC900 Controller:
900C30, 900C30S, 900C50, 900C50S
When CPU is initialized and at the 86 microamp level, the battery will retain energy over an extended
period. At the 6 mA level, the battery will retain sufficient energy to maintain the content of SDRAM for
approximately 30 days.
900C70, 900C70S, 900C75, 900C75S
When CPU is initialized and at the 86 microamp level, the battery will retain energy over an extended
period. At the 9 mA level, the battery will retain sufficient energy to maintain the content of SDRAM for
approximately 22 days.
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