Data Sheet

UB20.241
UB-Series
24V, 20A, DC-UPS
23.5. PARALLEL USE TO INCREASE OUTPUT CURRENT
Two DC-UPSs with two individual power supplies, two battery modules and one decoupling module can be used to
build a system with higher output current.
Fig. 23-4 Wiring example for parallel use to increase the output current
+ +
- -
Power
Supply
DC 24V, 20A
Output
AC Input
L N PE
Load
+
-
YR40.241
+ -
OUT
+ -
IN 1
+ -
IN 2
Ready
Buffering
Inhibit
UB20.241
DC-UPS
IN OUT
++
-
-
Inhibit
+ -
Ready
Buffering
BAT
+
-
Replace Battery
(13)
(12)
(11)
+
-
UZK24
Battery
Module
Center-tap
Temp.
Sensor
UB20.241
DC-UPS
IN OUT
++
-
-
Inhibit
+ -
Ready
Buffering
BAT
+
-
Replace Battery
(13)
(12)
(11)
+
-
UZK24
Battery
Module
Center-tap
Temp.
Sensor
+ +
- -
Power
Supply
DC 24V, 20A
Output
AC Input
L N PE
Buffering
23.6. PARALLEL USE FOR REDUNDANCY
Use the same schematic as for parallel use for higher output current Fig. 23-4 and follow additional the following
recommendations:
a) Use separate input fuses for each power supply.
b) Set the power supply into “Parallel use” mode if available.
c) Use a redundancy module to decouple the two power sources.
d) Monitor the individual sources. Therefore, use the alarm contacts of the power supplies.
e) It is desirable to set the output voltages of all power supplies to the same value (± 100mV) or leave it at the
factory setting.
Feb. 2016 / Rev. 2.1 DS-UB20.241-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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