6.1 Discharging Storage Unit Capacitors
Make sure ED2.0 Control Power is removed before attempting to discharge the
capacitors. See paragraph below.
The actuator control board provides access through KM1003 for discharging the Storage Unit
capacitors. Make sure the control board power is removed before attempting to discharge the
capacitors.
PROCEDURE:
A 10 kΩ capacitor discharge resistor is mounted on the circuit board. Discharging is done by
jumpering KM1003 pins 4 and 5. The time constant is 66 minutes. An external resistor can be
used for quicker discharging, but the discharge current should be restricted to 10A maximum.
This means that no lower than 10 Ω external resistances should be used to perform capacitor
discharging. In this case an external 10 Ω, 25 watt resistor can be connected to KM1003 Pins 4
and 6. Approximately 20 seconds is needed to discharge the capacitors using the 10 Ω external
resistor.
6.2 Capacitor Life
The standard 0.1 farad electrolytic capacitors are designed to be operated in the temperature
range of -40°F to 185°F (-40°C to 85°C). The end-of-life corresponds to the point at which the
capacitance decreases by 20% or more.
It is recommended that replacement of capacitors be performed every 15 years for tropical cli-
mates and 20 years for an average yearly temperature (in the outdoor breaker enclosure) of
less than 122°F. Extreme temperature capacitors are available as an option. These optional
capacitors are rated for operation between -67°F and 221°F. (-55°C to 105°C)
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