CS20.241, CS20.241-A1
C-Series
24V,
20A,
S
INGLE
P
HASE
I
NPUT
Preliminary
24.10.
C
HARGING OF
B
ATTERIES
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 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
b)
Use a 30A or 32A 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. 23mA when the power supply is
switched off (except in case a blocking diode is utilized).
24.11.
O
PERATION ON
T
WO
P
HASES
240V
+10
%
m
a
x
.
Fuse
L2
L1
L3
L
N
PE
Power Supply
AC
DC
internal
fuse
The power supply can also be used on two-phases of a three-phase-system.
Such a phase-to-phase connection is allowed as long as the supplying
voltage is below 240V
+10%
. Use a fuse or a circuit breaker to protect the N
input. The N input is internally not protected and is in this case connected to
a hot wire. Appropriate fuses or circuit breakers are specified in section 24.3
“External Input Protection”.
24.12.
U
SE IN A
T
IGHTLY
S
EALED
E
NCLOSURE
When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher
than outside. In such situations, the inside temperature defines the ambient temperature for the power supply.
The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.
The power supply is placed in the middle of the box, no other heat producing items are inside the box
Enclosure:
Rittal Typ IP66 Box PK 9522 100, plastic, 254x180x165mm
Load:
24V, 16A; (=80%) load is placed outside the box
Input:
230Vac
Temperature inside enclosure:
53.5°C (in the middle of the right side of the power supply with a distance of 2cm)
Temperature outside enclosure: 25.3°C
Temperature rise:
28.2K
Jan. 2012 / Rev. 0.5 DS-CS20.241-EN
Preliminary
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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