Duty Cycle; Calculation Of Back-Up Time; Capacitor Life - Michael Riedel Rdcusv C Serie Betriebsanleitung

8.1

DUTY CYCLE

10
7,5
I/A
5
Region 1
100% ED
2,5
0
-20 0
8.2

CALCULATION OF BACK-UP TIME

For long back-up times the current consumption of the system of approx. 130 ma must be considered!
Example RDCuSV 5C5:
Back-up time in sec. =
8.3

CAPACITOR LIFE

Duty cycle dependent upon load current and ambient temperature
Region 2
50% ED
Only the charging and discharging cycles of the capacitors are relevant for the duty
cycle. If the back-up module is completely charged and working in standby mode the
unit will not heat up. This case is hence thermally equivalent to a unit that is switched off.
• Region 1:
• Region 2:
20 40 60
t/°C
Capacitor energy in J x Efficiency
Output current x Output voltage
NOTE
Capacitor life is temperature-dependent!
The life has been reached when the capacity has dropped to 70% of the nominal capacity.
duty cycle
uninterrupted charging and discharging
50% duty cycle
Five successive charge-discharge cycles permitted
5000 J x 0,9
38 Sek. =
5a x 23,5V
Short-term delivery
8
l Subject to technical modifications