Hold-up time
The hold-up time is the time during which the output voltage of a power supply unit remains within the specification after a loss of input power. The hold-up time depends on the output load. Without load the hold-up time can be several seconds. The green DC-OK LED also lights up during this time.
  | 
  | AC 100 V  | AC 120 V  | AC 230 V  | 
  | 
|---|---|---|---|---|---|
Mains failure Hold-up time  | Typ.  | 26 ms  | 27 ms  | 28 ms  | At 24 V, 10 A, see Fig. Hold-up time over input voltage  | 
Typ.  | 51 ms  | 53 ms  | 55 ms  | At 24 V, 5 A, see Fig. Hold-up time over input voltage  | |
Min.  | 21 ms  | 22 ms  | 22 ms  | At 24 V, 10 A, see Fig. Hold-up time over input voltage  | |
Min.  | 41 ms  | 42 ms  | 44 ms  | At 24 V, 5 A, see Fig. Hold-up time over input voltage  | 
Fig.8: Hold-up time over input voltage; switch-off behavior, definitions