Puls CD Series - Safety and Protection Features; Dielectric Strength

CD10.241
CD-Series
DC/DC Converter 24V/24V, 10A, 240W
Sep. 2019 / Rev. 1.4 DS-CD10.241-EN All values are typical figures specified at 24Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany
16/27
16. S
AFETY AND
P
ROTECTION
F
EATURES
Isolation resistance
Min. 500MOhm At delivered condition between input and output,
measured with 500Vdc
Min. 500MOhm At delivered condition between input and Chassis
Ground, measured with 500Vdc
Min. 500MOhm At delivered condition between output and Chassis
Ground, measured with 500Vdc
PE resistance
Max. 0.1Ohm Resistance between PE terminal and the housing in
the area of the DIN-rail mounting bracket.
Output over
-voltage protection Typ. 31Vdc
Max. 32.5Vdc
In case of an internal defect, a redundant circuit limits the maximum
output voltage. The output shuts down and automatically attempts to
restart.
Class of protection
III According to IEC 61140
Degree of protectio
n IP 20 According to EN/IEC 60529
Over
-temperature protection Not included
Input transient protection
MOV (Metal
Oxide Varistor)
For protection values see chapter 14 (EMC).
Internal input fuse
Included Not user replaceable slow-blow high-braking
capacity fuse
Touch current
(leakage current) The leakage current, which is produced by the DC/DC converter itself, depends on
the input voltage ripple and need to be investigated in the final application.
For a smooth DC input voltage, the produced leakage current is less than 100µA.
17. D
IELECTRIC
S
TRENGTH
The output voltage is floating and has no ohmic connection to the ground.
The output is insulated to the input by a double or reinforced insulation.
Type and routine tests are conducted by the manufacturer. Field tests may be conducted in the field using the
appropriate test equipment which applies the voltage with a slow ramp (2s up and 2s down). Connect all input-
terminals together as well as all output poles before conducting the test. When testing, set the cut-off current settings
to the value in the table below.
Fig. 17-1 Dielectric strength
A B C
A
C
B
+
Input
Chassis
ground
Output
-
+
-
Type test 60s 1500Vac 1500Vac 500Vac
Routine test 5s 1500Vac 1500Vac 500Vac
Field test 5s 1000Vac 1000Vac 500Vac
Cut-off current setting 40mA 20mA 12mA
It is recommend that either the + pole, the – pole or any other part
of the output circuit shall be connected to the earth/ground system.
This helps to avoid situations in which a load starts unexpectedly or
can not be switched off when unnoticed earth faults occur.