Selector Guide & Performanc Specifications Computer Grades Types CGS, CGH, CG, HES, CGR, CGO Low Type Temperture Vdc Range Range CGS / CGH -40 ºC to +85 ºC Life Test High Low High Fq. High Long Low Hours @ ºC Cap ESR Imped. Ripple Life Cost 10 to 500 2000 +85 Good Good 10 to 450 2000 +85 Good Good Good Good CG -40 ºC to +85 ºC HES -40 ºC to +105 ºC 350 to 400 2000 +105 Good Good Good Good Good Good CGR -40 ºC to +105 ºC 7.5 to 200 2000 +105 Good Good Good Good Good Good CGO -40 ºC to +85 ºC 5 to 55 2000 +85 Best Good Good Good Best Comment Max cap, best value Standard life and ripple Max cap, long life Max ripple, low ESR Motor control, ultra high ripple High voltage Wide temperature range, MIL -C-39018/04, 06, 10 equivalent Good Lowest ESR Storage: From –55 ºC to maximum operating temperature up to 200,000 feet above sea level Test Conditions Surge Test: Connect capacitor in series with resistor as follows: C = 0 to 2500 µF R = 1000 Ω C = 2500 to 25,000 µF R = 500 Ω C = ≤ 25,001 µF R = 100 Ω Subject the series combination to rated surge voltage. For capacitors rated at +85 ºC, apply surge voltage for 30 seconds. Allow capacitor to discharge through resistor. Apply voltage again after 9.5 minutes. Repeat 10 minute cycle for 24 hours. For capacitors rated at +105 ºC, apply voltage for 30 seconds and off for 5.5 minutes for 1,000 cycles. Following surge test, allow capacitors to cool to room temperature and measure DCL. DCL is not to increase from initial requirement and no electrolyte shall have leaked. Vibration: Clamp capacitor to a vibrating platform and subject it to simple harmonic motion with a maximum peak-to-peak amplitude of 0.06” and maximum acceleration of 10 g. Vary the frequency linearly between 10 and 55 Hz. Entire range of 10 to 55 Hz must be traversed in one minute. Vibrate capacitor for 1-1/2 hours with the direction of motion being parallel to the axis of the capacitor. Then move the capacitor so the direction of motion is perpendicular to the axis of the capacitor and continue the vibration for an additional 1-1/2 hours. During the last 30 minutes of the test connect the capacitor to a bridge and observe for 3 minutes. There will be no evidence of loosening of the capacitor element within the case when shaken by hand following the test. No indication of intermittent contact, open or shorting is allowed during the 3 minute observation period. Load Life Test: Use a circulating air oven set to capacitor(s) maximum operating temperature. Seperate capacitors to maintain temperature –0 ºC +3 ºC. Apply rated VDC for rated life ±12 hours using regulated power supply free from turn-on / turn-off voltage transients. At end of test, return capacitors to room temperature for 24 hours (minimum). Container Seal: Following the vibration test, each capacitor for seal tightness as follows: Subject the capacitors to two successive temperature cycles in circulating air. One temperature cycle is: A. 85 ºC for 30 minutes B. 25 ºC for 30 minutes C. -40 ºC for 30 minutes D. 25 ºC for 30 minutes Following the second cycle, immerse the capacitor in 90 to 95 ºC water for five minutes. A failure is a continuous chain of bubbles when immersed. DCL is not to exceed initial requirement. Capacitance must not be less than 85% of initial measured value. ESR must not be greater than: Type % of Initial Requirement CGS / CGH 175 CG / HES 175 CGR 100 CGO 175 Vent Test: Apply reverse DC voltage to a capacitor at 15 to 25 A. If the capacitor is open or shorts and the vent has not operated, test additional capacitors. The vent must operate and there must be no explosion. Full Ripple Life Test: Use a circulating air oven as in Load Life Test. Apply DC voltage with rated ripple current from AC source and reduce DC voltage unit sum of DC voltage and peak AC voltage equals capacitor’s rated voltage. At end of life test return capacitors to room temperature for 24 hours (minimum). Capacitance, ESR and DCL must meet Load Life Test requirements. Shelf Life: Capacitors stored more than 5 years should be checked for DCL to see if they meet requirements. Apply rated VDC for 30 minutes through a 1000 Ω resistor to bring DCL within limits. Shelf Life Test: Use a circulating air oven as above for rated shelf life ±6 hours. Allow capacitors to cool to room temperature and stabilize or a minimum of 16 hours. Capacitance, ESR and DCL will meet initial re- Mounting: The preferred mounting for large computer grade capacitors is in the vertical position with the pressure relief vent up or horizontal with the pressure relief valve up. Be sure to allow 1/2 inch (minimum) clearance to permit the vent to operate. Voltage Reversal: Capacitors will withstand a maximum 1.5 VDC reverse bias. CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830 • www.cde.com Selector Guide & Performanc Specifications Computer Grades CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830 • www.cde.com Selector Guide & Performanc Specifications Computer Grades CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830 • www.cde.com