Data Sheet

UC10.241, UC10.242
UC-Series
24V, 15A, CAPACITOR-BASED DC-UPS
9. PC-MODE
The PC-mode always turns the output off for at least 5s after a buffer event lasting longer than 1s, independent of
whether the 24V may have recovered during this time. This function ensures that the PC gets a restart signal. To
enable a safe shut-down of the system, the forced turn off of the output is delayed with a constant time of 70s.
To activate the PC-mode, connect the two pins marked with “PC-mode” together on the signal connector together.
If the reset is to be controlled by the PC and not the DC-UPS, a wiring option called “external controlled delayed shut-
down” is available. See section 23.8 for details.
Fig. 9-1 PC-Mode -
Buffer event ends before buffer capacitors are discharged and buffer event is
shorter than 70s
>1s
Power Supply Output
DC-UPS Output
full
empty
Capacitor
Ready
Contact
closed
open
Buffering
Contact
closed
open
5s
70s
Example A:
The buffer event is longer than 1s
and ends before the buffer capacitors
are fully discharged.
After 70s of the beginning of the
buffer event, the output of the DC-
UPS will be switched off for 5s.
Fig. 9-2 PC-Mode -
Buffer event discharges the buffer capacitors before the input recovers
Power Supply Output
DC-UPS Output
full
empty
Capacitor
Ready
Contact
closed
open
10/27
Buffering
Contact
closed
open
5s
Example B:
The buffer event lasts longer than the
buffer capacitors can supply the
output.
The buffer capacitors are fully
discharged before the input voltage
recovers.
The DC-UPS output will turn-on
earliest 5s after the power supply
output voltage has recovered.
May 2016 / Rev. 2.2 DS-UC10.241-EN
All parameters are specified at 24V, 10A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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