Hold-up time – Rockwell Automation 1606-XLE960DX-3N Power Supply Reference Manual User Manual
Page 7
All parameters are specified at 24V, 40A, 3x480Vac, 25°C ambient and after a 5 minutes run-in time, unless noted otherwise.
Rockwell Automation Publication 1606-RM024A-EN-P — April 2014
7
Bulletin 1606 Switched Mode Power Supplies
8. Hold-up Time
1606-XLE960DX-3N
Hold-up Time typ.
2.0ms 40A, resistive load, see Fig. 8-2
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8
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1
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Fig. 8-2
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0
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4
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20A, resistive load
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6
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3
.
p
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Hold-up Time min.
1.6ms 40A, resistive load, see Fig. 8-2
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4
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5
4
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1
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n
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m
Fig. 8-2
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2
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3
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m
20A, resistive load
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9
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Fig. 8-1 Hold-up time, definitions
The energy is stored in the output capacitor. As
soon as the input is turned off, 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 defined as the period of time
when the input is turned off and until the output
voltage falls below 24V –15% (20.4V). This value is
defined 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
24V
12V
18V
14V
V
OUT
22V
16V
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
8.0
5.0
8.5 9.0ms
40A, constant power load, typ.
40A, resistive load, typ.
T
40A, constant power load, min.
40A, resistive load, min.
20.4V
Note: At no load, the hold-up time can be up to one minute. The green DC-ok LED is on at this time.