QT40.361 Datasheet, PDF (24/27 Pages) PULS GmbH – THREE PHASE INPUT

Q-Series
QT40.361
36V, 26.7A, THREE PHASE INPUT
24.5. CHARGING OF BATTERIES
The power supply can be used to charge lead-acid or maintenance free batteries. (Three 12V batteries in series)
Instructions for charging batteries:
a) Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge
voltage.
End-of-charge voltage
41.7V
41.25V
40.8V
40.35V
Battery temperature
10°C
20°C
30°C
40°C
b) Use a 32A or 40A circuit breaker (or blocking diode) between the power supply and the battery.
c) Ensure that the output current of the power supply is below the allowed charging current of the battery.
d) Use only matched batteries when putting 12V types in series.
e) The return current to the power supply (battery discharge current) is typ. 25mA when the power supply is
switched off (except in case a blocking diode is utilized).
24.6. OUTPUT CIRCUIT BREAKERS
Standard miniature circuit breakers (MCB’s or UL1077 circuit breakers) are commonly used for AC-supply systems and
may also be used on DC branches.
MCB’s are designed to protect wires and circuits. If the ampere value and the characteristics of the MCB are adapted to
the wire size that is used, the wiring is considered as thermally safe regardless of whether the MCB opens or not.
To avoid voltage dips and under-voltage situations in adjacent 36V branches which are supplied by the same source, a
fast (magnetic) tripping of the MCB is desired. A quick shutdown within 10ms is necessary corresponding roughly to
the ride-through time of PLC's. This requires power supplies with high current reserves and large output capacitors.
Furthermore, the impedance of the faulty branch must be sufficiently small in order for the current to actually flow.
The best current reserve in the power supply does not help if Ohm’s law does not permit current flow. The following
table has typical test results showing which B- and C-Characteristic MCBs magnetically trip depending on the wire cross
section and wire length.
Fig. 24-9 Test circuit
Maximal wire length^*) for a fast (magnetic) tripping:
0.75mm² 1.0mm² 1.5mm² 2.5mm²
C-2A
51m
63m
101m
143m
C-3A
43m
57m
84m
129m
Power Supply MCB
Load
C-4A
34m
44m
64m
103m
AC
+
DC ^-
Wire length
+
S1
-
C-6A
15m
C-8A
8m
C-10A
5m
C-13A
2m
21m
32m
49m
11m
14m
25m
7m
9m
17m
3m
4m
8m
S1... Fault simulation switch
B-6A
33m
43m
56m
102m
B-10A
18m
24m
37m
55m
B-13A
9m
19m
30m
47m
B-16A
4m
6m
9m
14m
*) Don’t forget to consider twice the distance to the load (or cable length) when calculating the total wire length (+ and – wire).
Dec. 2016 / Rev. 1.3 DS-QT40.361-EN
All parameters are specified at 36V, 26.7A, 3x400Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone [phone] Germany
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