Allen-Bradley 1606-XLB480E, Manual, Page: 10 / 26

10 Rockwell Automation Publication 1606-RM104A-EN-P - July 2020
Hold-up Time
The hold-up time is the time during which 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.
DC OK Relay Contact
This feature monitors the output voltage on the output terminals of a running
power supply.
Figure 11 - DC OK relay contact behavior
Type and Conditions AC 100V AC 120V AC 230V References
Hold-up time
Typ at 24V, 10 A 54 ms 54 ms 54 ms See Figure 9
Min at 24V, 10 A 44 ms 44 ms 44 ms See Figure 9
Typ at 24V, 20 A 27 ms 27 ms 27 ms See Figure 9
Min at 24V, 20 A 22 ms 22 ms 22 ms See Figure 9
Figure 9 - Hold-up time vs. input voltage Figure 10 - Shut-down behavior, definitions
0
10
20
30
60 ms
85 120 155 190 230V AC
Input Voltage
40
50
Hold-up Time
24V, 20 A, typ.
24V, 10 A, min.
24V, 10 A, typ.
24V, 20 A, min.
- 5%
Hold-up Time
Zero Transition
Output
Voltage
Input
Voltage
Attributes Descriptions
Contact closes As soon as the output voltage reaches 22V.
Contact opens As soon as the output voltage falls below 22V.
Switching
hysteresis
0.3V typ
Contact ratings
Maximal 60V DC 0.3 A, 30V DC 1 A, 30V AC 0.5 A, resistive load
Minimal permissible load: 1 mA at 5V DC
Isolation voltage See dielectric strength table in Dielectric Strength on page 17 .
22V
open
Output Voltage
closed