Battery & Energy Pack Manual Chapter 4
GFK-2741J Oct 2019
Supercapacitors 32
Chapter 4: Supercapacitors
Supercapacitors are used in industrial controller technology to provide backup for volatile
memory. They provide much higher capacitance than traditional capacitors. They typically
store 10 to 100 times more energy per unit volume than electrolytic capacitors. They may
be charged up quickly, and can deliver current much more quickly than batteries. They can
also withstand repeated charge and discharge cycles.
4.1 CPUs with Supercapacitors
The following CPUs contain supercapacitors:
•
RSTi-EP EPSCPE100
•
RSTi-EP EPSCPE115
4.2 Replacing Supercapacitors
CPUs which contain supercapacitors are typically designed so that the supercapacitors may
be replaced when needed. An alarm is sent to the CPU when the supercapacitors need
replacement. The user manual will inform the user where to locate the supercapacitor
circuit board, and how to remove and replace it. Please refer to the manual for each CPU, as
these details will necessarily be unique for each product.
In non-redundant control systems, shut down the operation or process before removing the
CPU.
CAUTION
Perform all electrical replacements in a suitably clean and dry environment. Clean away all
surface contaminants before opening the electrical circuit enclosure.
Protect the exposed circuitry from electrostatic discharge, as this may destroy or disable
components. Wear a ground-strap while working on exposed circuitry.
Dispose of electrical circuit waste in accordance with local laws and regulations.
WARNING
Supercapacitors retain charge for a significant period. A risk of electrical shock exists while
the supercapacitors are charged up. A discharge could cause either personal injury or
damage to equipment.
Be sure that the unit under repair has been disconnected from its power source for several
minutes (consult the relevant user manual). Do not attempt to replace until the
supercapacitors have discharged completely.
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