Data Sheet

QT20.241, QT20.241-C1
Q-Series
24V, 20A, THREE PHASE INPUT
Apr. 2017 / Rev. 2.1 DS-QT20.241-EN
21.3. UF20.241 - BUFFER MODULE
20/27
rocess.
This buffer unit is a supplementary device for DC 24V power supplies. It delivers power
to bridge typical mains failures or extends the hold-up time after turn-off of the AC
power. In times when the power supply provides sufficient voltages, the buffer unit
stores energy in the integrated electrolytic capacitors. In case of mains voltage fault, this
energy is released again in a regulated p
The buffer unit does not require any control
wiring. It can be added in parallel to the load
circuit at any given point. Buffer units can be
added in parallel to increase the output ampacity
or the hold-up time.
DC
Buffer
Unit(s)
Power
Supply
Load
AC
+
-
21.4. YR40.241 - REDUNDANCY MODULE
The YR40.241 redundancy module is equipped with two input channels (20A each), which
are individually decoupled by utilizing MOSFET technology. The output current can go as
high as 40A.
Using MOSFET instead of diodes reduces the heat generation and the voltage drop
between input and output. The YR40.241 does not require an additional auxiliary voltage
and is self-powered even in case of a short circuit across the output.
Due to the low power losses, the unit is very slender and only requires 36mm width on the
DIN-rail.
Fig. 21-6 Typical 1+1 Redundant configuration for
20A with one dual redundancy module und two
power supplies
Fig. 21-7 Typical N+1 Redundant configuration for 60A with two dual
redundancy modules and four power supplies
L1
L2
PE
L3
20A
Load
Failure
Monitor
I I I I I I
L1 L2 L3 PE
+ +
- -
QT20.241
24V,20A
DC-
OK
L1 L2 L3 PE
+ +
- -
QT20.241
24V,20A
DC-
OK
YR40.241
Redundancy
Module
Output
Input
1
Input
2
+
-
+
-
+
-
Failure
Monitor
60A
Load
I I II I I I I I
L1
L2
PE
L3
L1 L2 L3 PE
+ +
- -
QT20.241
24V,20A
DC-
OK
L1 L2 L3 PE
+ +
- -
QT20.241
24V,20A
DC-
OK
Input
1
Input
2
YR40.241
Redundancy
Module
Output
+
-
+
-
+
-
L1 L2 L3 PE
+ +
- -
QT20.241
24V,20A
DC-
OK
L1 L2 L3 PE
+ +
- -
QT20.241
24V,20A
DC-
OK
Input
1
Input
2
YR40.241
Redundancy
Module
Output
+
-
+
-
+
-
I I I
All parameters are typical values specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after
a 5 minutes run-in time unless otherwise noted.
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