UF40.241
UF-Series
24V,
40A,
160
MS
,
B
UFFER
M
ODULE
5.
S
ELECTION OF THE
B
ACK
-
UP
T
HRESHOLD
V
OLTAGE
The buffer behavior can be selected with the back-up jumper selector between “Fixed Mode” and “Variable Mode”.
Fixed Mode:
(Jumper in position „2-3“ or „22.5V fixed”)
If the supply output voltage falls below 22.5V, buffering starts and the supply voltage will be kept at this level.
This adjustment is recommended:
- when power supplies other than the DIMENSION Q-series are used
- with back-feeding loads
- when the buffer module is placed close to the load or
- whenever in doubt.
Variable Mode:
(Jumper in position „1-2“ or „V
IN
– 1V”)
Buffering starts if the supply voltage decreases by more than 1V. Buffering ends when supply voltage increases by
more than 1V
Voltage changes slower than 0.54V/s will be ignored if the voltage is above 22.5V. Below 22.5V buffering starts
immediately.
This adjustment is recommended for any application where 22.5V is too low for the application or when the buffer
module is placed close to the power supply.
The factory setting is fixed mode, A missing jumper means also fixed mode.
6.
B
UFFER
T
IME
The buffer time (sometimes also called autonomy time) is the maximum period of time for which the capacitor can
maintain the required output current. The buffer time mainly depends on the output current in buffer mode.
To increase the buffer time any given number of buffer modules can be connected in parallel.
Buffer time
Min.
160ms
At 22.5V, 40A
Min.
320ms
At 22.5V, 20A
Typ.
250ms
At 22.5V, 40A
Typ.
500ms
At 22.5V, 20A
Typ.
62s
At 22.5V, 0.1A
Fig. 6-1
Buffer time, typ.
Fig. 6-2
Buffer time for small buffer currents,
typ.
Buffer Current, typ.
0
0 0.3
3s
10
30
20
40A
0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.4
Buffer Time
Buffer Current, typ.
0
3
18s
0.5
1.5
1.0
2.0A
6
9
12
15
Buffer Time
Oct. 2016 / Rev. 1.0 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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