8
Short-term delivery l Subject to technical modifications
8.1 DUTY CYCLE
0
2,5
5
7,5
10
-20
0
20
40
60
t/°C
Region 1
100% ED
Region 2
50% ED
I/A
Duty cycle dependent upon load current and ambient temperature
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:
duty cycle
uninterrupted charging and discharging
• Region 2:
50% duty cycle
Five successive charge-discharge cycles permitted
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:
Capacitor energy in J x Efficiency
5000 J x 0,9
Back-up time in sec. =
38 Sek. =
Output current x Output voltage
5a x 23,5V
8.3 CAPACITOR LIFE
NOTE
Capacitor life is temperature-dependent!
The life has been reached when the capacity has dropped to 70% of the nominal capacity.
