CS10.241, CS10.241-S1
CS-Series
24V,
10A,
240W
S
INGLE
P
HASE
I
NPUT
Aug. 2022 / Rev. 2.1 DS-CS10.241-EN
All parameters are specified at 24V, 10A, 230Vac, 50Hz, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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24/27
22.2.
B
ACK
-
FEEDING
L
OADS
Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called return voltage
immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power supply. It does not matter
whether the power supply is on or off.
The maximum allowed feed-back-voltage is 35Vdc. The absorbing energy can be calculated according to the built-in large sized output
capacitor which is specified in chapter 6.
22.3.
E
XTERNAL
I
NPUT
P
ROTECTION
The unit is tested and approved for branch circuits up to 20A. An external protection is only required if the supplying branch has an
ampacity greater than this. Check also local codes and local requirements. In some countries local regulations might apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of the circuit
breaker. A minimum value of 10A B- or 6A C-Characteristic breaker should be used.
22.4.
O
UTPUT
C
IRCUIT
B
REAKERS
Standard miniature circuit break
ers (MCB’s or UL
1077 circuit breakers) are commonly used for AC-supply systems and may also be used
on 24V branches.
MCB’s are design
ed 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 powe
r 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 chapter and wire length.
Fig. 22-3
Test circuit
Maximal wire length
*)
for a fast (magnetic) tripping:
MCB
Power Supply
AC
DC
+
-
+
-
Load
Wire length
S1... Fault simulation switch
S1
0.75mm²
1.0mm²
1.5mm²
2.5mm²
C-2A
21m
26m
37m
68m
C-3A
15m
21m
30m
51m
C-4A
10m
14m
20m
38m
C-6A
4m
6m
9m
16m
C-8A
1m
2m
4m
6m
C-10A
1m
2m
3m
4m
B-6A
13m
18m
26m
42m
B-10A
10m
5m
9m
11m
*)
Don’t forget to c
onsider twice the distance to the load (or cable length) when calculating the total wire length (+ and
–
wire).
