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T Series Data Sheet
?
For systems, where only a small battery back-up time is
required, battery charging by one T unit may be sufficient; see
also fig. below.
500 Watt AC-DC Converters
threshold level of Power Down. This prevents further
discharge of the battery.
Caution: Lead-acid batteries can generate certain amounts of H 2
and O 2 gas, which can form explosive gas mixtures. Sufficient
+ –
06083a
ventilation must be provided in battery cabinets and installation
rooms.
+
–
48Q/CQ
+
Note: Local regulations must be observed. Further information
Out OK–
about designing battery systems is contained in VDE 0510, part 2.
Fuse
Out OK+
Combination with DC-DC Converters
Vo+
HC+
i
–
The T Series converters are designed to be operated with
DC-DC converter loads. Particularily suitable are 48Q
HC–
Vo–
+
–
48Q/CQ
+
models, as they start working at approx. 38 V, thus avoiding
Out OK–
high currents at ramp-up. But also other series may be used,
L
L
Out OK+
for instance our CQ or P Series.
In a complete power system consisting of several T converters
connected in parallel combined with 48Q/CQ units, it may be
desirable to have one common signal indicating the status of
the whole system.
N
N
D
Sys Out
R
i
+
48Q/CQ
–
Out OK–
–
+
Sys In
Out OK+
The DC-DC converters provide a galvanically isolated signal
Out OK. To obtain a logic AND, all Out OK signals should be
i/Vcr
D set
43.2 k ?
i
–
connected in series; see fig. below:
If in a system with 2 redundant T Series converters Power
Down is desired as one common signal, simply connect the D
pins of the two T converters. Then, Power Down only becomes
active, if both T converters fail, which would result in the bus
R ext
+
–
Temp. sensor T
voltage failing (see fig. below).
+ –
Fig. 36
Disconnecting the loads at low battery voltage in case of
L
N
Vo+
Vo–
R
06082a
+ 48Q/CQ +
–
Out OK–
Out OK+ –
mains’ failure
Storing the System Good Signal
L
N
Sys Out
Sys In D
Sys Out D
R
Overall
System
Good
Power
Down
+ 48Q/CQ +
–
Out OK–
Out OK+ –
For battery back-up systems located in inaccessible areas it
could be of interest to know, whether there has been a Power
Fail (interruption of the mains). To obtain this information, Sys
Out should be connected to Sys In with a reset button
connected to Vo–. In this way a system failure like an
interruption of the mains will be stored at Sys Out until, the
reset button is pressed.
L
Vo+
Vo–
+
–
48Q/CQ
+
+
–
06084a
N
Sys In
Out OK–
Out OK+ –
Vo+
Fuse
+
48Q/CQ
+
HC+
+ –
HC–
Fig. 35
Overall System Good and Power Down signal in a redundant
system
L
N
L
N
Vo–
Sys Out
R
Stored
–
+
–
Sys Out
–
Low-Battery Discharge Protection
Sys In
Since all monitoring functions are powered by the output of the
i/Vcr
Reset
Temp. sensor T
T converter or the battery, in the case of a mains’ failure, Power
Down can be used to monitor the status of the battery and to
disconnect the load or part of it via the inhibit of the connected
DC/DC converters, when the battery voltage drops below the
Fig. 37
Storing the System Good signal
BCD20023 Rev AB, 02-Nov-2010
Page 19 of 31
www.power-one.com
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