QUINT-PS/24DC/24DC/ 5/CO
105537_en_01 PHOENIX CONTACT 16
15.3 Active switching output “U
IN
>19.2V”
During normal operation of the DC/DC converter, the
U
IN
>19.2V output signal is between connection terminal
blocks "U
IN
>19.2V” and “-” and can carry a maximum of
20mA. The U
IN
>19.2V signal output indicates a low input
voltage by switching from “active high” to “low”.
16 Derating
16.1 Temperature-dependent derating
With an ambient temperature of up to +40°C, the device
supplies the continuous output current of I
BOOST
. The de-
vice can supply a nominal output current of I
N
with ambient
temperatures of up to +60°C. In the case of ambient temper-
atures above +60°C, the output current must be reduced by
2.5% per Kelvin increase in temperature. The device does
not switch off at ambient temperatures of +70°C or thermal
overload. The output capacity is reduced as far as neces-
sary to provide device protection. After it has cooled down,
the output capacity is increased again.
16.2 Voltage-dependent derating
The nominal input voltage of 24VDC is divided into the
areas of starting and operation. The DC/DC converter re-
quires at least 18VDC for cold starting, whereby the input
voltage can sink to 14VDC during operation. The device
only switches off under this limit. The upper voltage limit is
32VDC for both starting and operation.
18 ... 24 V DC
20 mA
U >19,2V
IN
PLC Digital Input
+
-25
0
40 6020
I
BOOST
I
N
Ambient temperature [°C]
Output
curren
t [A]
100%
125%
14
15 16 17 18
[U /V]
IN
[I /A]
OUT
=12VU
OUT
U = 13 V
OUT
U = 14 V
OUT
-25 ℃ ... 40 ℃
40 ℃ ... 60 ℃
