CT10.241

C-Series

The power supply can be used to charge lead-acid or maintenance free batteries. (Two 12V batteries in series)

Instructions for charging batteries:

a)

Set jumper on the front of the unit into “Parallel Use”

b)

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

27.8V

27.5V

27.15V

26.8V

Battery temperature

10°C

20°C

30°C

40°C

c)

Use a 16A circuit breaker (or blocking diode) between the power supply and the battery.

d)

Ensure that the output current of the power supply is below the allowed charging current of the battery.

e)

Use only matched batteries when putting 12V types in series.

f)

The return current to the power supply (battery discharge current) is typ. 8mA when the power supply is switched

off (except in case a blocking diode is utilized).

Standard miniature circuit breakers (MCB’s or UL1077 circuit breakers) are without doubt, one of the most efficient

and economical ways to open circuits on faulty branches. Most of these breakers may also be used on 24V 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 24V 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. 23-3 Test circuit

0.75mm²

1.0mm²

1.5mm²

2.5mm²

C-2A

23m

28m

43m

69m

C-3A

18m

23m

34m

54m

C-4A

6m

12m

18m

28m

C-6A

3m

4m

6m

7m

C-8A

2m

3m

4m

5m

C-10A

1m

2m

3m

4m

B-6A

9m

14m

19m

33m

B-10A

4m

5m

6m

9m

MCB

Power

Supply

18/22

AC

DC

+

-

Load

+

-

B-13A

3m

4m

5m

8m

Wire length

S1...... Fault Simulation Switch

S1

*)

Don’t forget to consider two times the distance to the load (or cable length) when calculating the total wire length (+ and – wire).

Jan. 2010 / Rev. 1.3 DS-CT10.241-EN

All parameters are specified at 24V, 10A, 3x400Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

www.pulspower.com Phone +49 89 9278 0

Germany