Datasheet

QTD20.241
Q-Series
24V, 20A, DC INPUT
Mar 2012 / Rev. 1.2 DS-QTD20.241-EN
All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone [phone] Germany
17. PROTECTION FEATURES
Output protection Electronically protected against overload, no load and short circuits *)
Output over-voltage protection typ. 32Vdc
max. 35Vdc
In case of an internal power supply fault, a redundant circuit
limits the maximum output voltage. The output shuts-down
and automatically attempts to restart.
Reverse input polarity protection included Unit does not start when input voltage is reversed
Degree of protection IP 20 EN/IEC 60529
Penetration protection > 3.5mm e.g. screws, small parts
Over-temperature protection yes Output shut-down with automatic restart
Input transient protection MOV (Metal Oxide Varistor) and active transient filter
Internal input fuse 4A, midget size
KLKD (Littelfuse)
The unit is equipped with two internal input fuses (+ line
and - line) which protect the unit against internal short
circuits and ground faults. The fuses are not user accessible.
A tripping of an internal fuse is caused by an internal fault.
*) An audible noise may be heard during a no load, overload or short circuit event.
18. SAFETY
Input / output separation SELV IEC/EN 60204-1, EN 60950-1:2006
PELV EN 60204-1, EN 50178, IEC 60364-4-41
double or reinforced insulation
Class of protection I PE (Protective Earth) connection required
Isolation resistance > 5MOhm Input to output, 500Vdc
PE resistance < 0.1Ohm Between housing and PE terminal
Touch current (leakage current) The leakage current which is produced by the power supply 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.
19. DIELECTRIC STRENGTH
Fig. 19-1 Dielectric strength
A B C D
Type test 60s 2500Vac 3000Vac 500Vac 500Vac
Factory test 5s 2500Vac 2500Vac 500Vac 500Vac
Field test 5s 2000Vac 2000Vac 500Vac 500Vac
A
D
C
B
B
+
Input DC-ok
Earth
Output
-
+
-
Type tests and factory tests:
Conducted by the manufacturer. Do not repeat test in field!
Rules for field test:
Use appropriate test equipment which applies the voltage
with a slow ramp! Connect all input poles together as well
as all output poles.
The output voltage is floating and has no ohmic connection to ground.
To fulfill the PELV requirements according to EN60204-1 paragraph 6.4.1, PULS recommend that either the + pole or
the – pole shall be connected to the protective earth system. This helps to avoid situations in which a load starts
unexpectedly or cannot be switched off when an unnoticed ground fault occurs.
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