10
Rockwell Automation Publication 1606-RM117A-EN-P - July 2020
Hold-up Time
The hold-up time is the time during which the output voltage of a power supply
remains within specification following the loss of input power. The hold-up
time is output load dependent. At no load, the hold-up time can be up to
several seconds. The green DC OK lamp is also on during this time.
Attributes
Values
Notes
AC 100V
AC 120V
AC 230V
Hold-up Time
Typ
13 ms
23 ms
107 ms
At 12V, 5 A
Typ
36 ms
55 ms
219 ms
At 12V, 2.5 A
Min
10.5 ms
18 ms
85 ms
At 12V, 5 A
Min
28.5 ms
43 ms
175 ms
At 12V, 2.5 A
Figure 12 - Hold-up Time Versus Input Voltage
Figure 13 - Shut-down Behavior, Definitions
0
20
40
100
120 ms
90
120
155
190
230V AC
Input Voltage
Hold-up Time
60
80
a) 12V 2.5 A typ
b) 12V 2.5 A min
c) 12V 5.0 A typ
d) 12V 5.0 A min
a
b
c
d
- 5%
Hold-up Time
Zero Transition
Output
Voltage
Input
Voltage
