Puls CP Series - Back-Feeding Loads; Use in a Tightly Sealed Enclosure

CP10.241-60
CP-Series
24V, 200W, DC/DC CONVERTER
P R E L I M I N A R Y
24.8. BACK-FEEDING LOADS
Loads such as decelerating motors and inductors can feed voltage back to the DC/DC converter. This feature is also
called return voltage immunity or resistance against Back- E.M.F. (E
lectro Magnetic Force).
This DC/DC converter is resistant and does not show malfunctioning when a load feeds back voltage to the DC/DC
converter. It does not matter whether the DC/DC converter is on or off.
The maximum allowed feed-back-voltage is 35Vdc. The maximum allowed feed-back-voltage is 35Vdc. The maximum
allowed feed-back peak current is 40A. Higher currents can temporarily shut-down the output voltage. The absorbing
energy can be calculated according to the built-in large sized output capacitor which is specified in chapter 6.
24.9. USE IN A TIGHTLY SEALED ENCLOSURE
When the DC/DC converter 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 DC/DC
converter.
The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.
The DC/DC converter is placed in the middle of the box, no other heat producing items are inside the box
Test 1: 80% load
Enclosure: Rittal Typ IP66 Box PK 9519 100, plastic, 180x180x165mm
Load: 24V, 6.6A; (=80%) load is placed outside the box
Input: 110Vdc
Temperature inside enclosure: 46.3°C (in the middle of the right side of the DC/DC converter with a distance of 2cm)
Temperature outside enclosure: 27.8°C
Temperature rise: 18.5K
Test 2: 100% load
Enclosure: Rittal Typ IP66 Box PK 9519 100, plastic, 180x180x165mm
Load: 24V, 8.3A; (=100%) load is placed outside the box
Input: 110Vdc
Temperature inside enclosure: 49.7°C (in the middle of the right side of the DC/DC converter with a distance of 2cm)
Temperature outside enclosure: 28.1°C
Temperature rise: 21.6K
May 2017 / Rev. 0.1 DS-QS10.241-60-EN preliminary
All parameters are typical values specified at 24V, 8.3A output, 110Vdc input, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted.
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