User Manual

All parameters are specified at 48V, 20A, 3x480Vac, 25°C ambient and after a 5 minutes run-in time, unless noted otherwise.
Rockwell Automation Publication 1606-RM025A-EN-P — April 2014 7
Bulletin 1606 Switched Mode Power Supplies
8. Hold-up Time
1606-XLE960MX-3N
Hold-up Time typ. 3.1ms 20A, resistive load, see Fig. 8-2
ees ,daol rewop tnatsnoc ,A02 sm7.2 .pyt Fig. 8-2
sm2.6 .pyt
10A, resistive load
daol rewop tnatsnoc ,A01 sm4.5 .pyt
Hold-up Time min. 2.5ms 20A, resistive load, see Fig. 8-2
ees ,daol rewop tnatsnoc ,A02 sm2.2 .nim Fig. 8-2
sm0.5 .nim 10A, resistive load
daol rewop tnatsnoc ,A01 sm4.4 .nim
Fig. 8-1 Hold-up time, denitions
The energy is stored in the output capacitor. As
soon as the input is turned o, the output
capacitor will be discharged and the voltage will
dissipate according to the curves in
Fig. 8-2
The lighter the load, the longer the hold-up time.
half the load means twice the hold-up time.
The hold-up time depends on the load
characteristic. The curves below show the hold-up
time for a load with a resistive and a constant
power characteristic.
The hold-up time is dened as the period of time
when the input is turned o and until the output
voltage falls below 48V
–15%
(40.8V). This value is
dened in the IEC61131-2 as the lower limit for the
supplying voltage.
-15%
Hold-
up
Time
Zero Transition
Output
Voltage
Intput
Voltage
Fig. 8-2 Hold-up time vs. input voltage
48V
24V
36V
28V
V OUT
44V
32V
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
5.5 6.0 6.5 7.0 7.5 8.05.0 8.5 9.0
20A, constant power load, typ.
20A, resistive load, typ.
T
20A, constant power load, min.
20A, resistive load, min.
40.8V
11ms9.5 10 10.5
Note: At no load, the hold-up time can be up to one minute. The green DC-ok LED is on at this time.