40
1VAL050601-MB Rev C
APPENDIX C
ELECTRONIC CONTROL BOARD
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 the replacement of capacitors be performed every 15 years for tropical climates and
20 years for an average yearly temperature of less than 122°F.
POWER CONSIDERATIONS
The control board power supply recharge unit adapts any voltage within the specified range of the board to
maintain 80 V across the capacitors. The following voltage thresholds must be reached to complete the speci-
fied operations:
1. The capacitor voltage threshold for an Open operation is 49 volts.
2. The capacitor voltage threshold for a Close-Open operation is 72.5 volts.
3. The capacitor voltage threshold for a Open-Close-Open operation is 78 volts.
Apx. Table 3 CB Operations Vs. Available Capacitor Charge
CAPACITOR CHARGE
CIRCUIT BREAKER POSITION
CLOSE OPEN
Energy sufficient for O-CO operations Open allowed Close allowed
Energy sufficient for CO operations Open allowed Close allowed
Energy sufficient for O operations Open allowed Blocked in open position
Energy insufficient for any operation Blocked in closed position or CB
opened (depending on dip switch
setting - I1004)
Blocked in open position
Provided by Northeast Power Systems, Inc. (NEPSI)
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