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.
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26.8. SERIES OPERATION
The power supply can be put in series to increase the output voltage.
Fig. 26-8 Schematic for series operation
Instructions for use in series:
Unit B
-
+
Load
+
-
Input
Output
-
+
Unit A
Earth
(see notes)
Input
Output
a) It is possible to connect as many units in series as needed,
providing the sum of the output voltage does not exceed
150Vdc.
b) Voltages with a potential above 60Vdc are not considered
SELV any longer and can be dangerous. Such voltages must
be installed with a protection against touching.
c) For serial operation use power supplies of the same type.
d) Earthing of the output is required when the sum of the
output voltage is above 60Vdc.
e) Keep an installation clearance of 15mm (left/right) between
two power supplies and avoid installing the power supplies
on top of each other.
Note:
Avoid return voltage (e.g. from a decelerating motor or
battery) which is applied to the output terminals.
26.9. INDUCTIVE AND CAPACITIVE LOADS
The unit is designed to supply any kind of load, including unlimited capacitive and inductive loads.
26.10. USE IN A TIGHTLY SEALED ENCLOSURE
When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher
than the outside. The inside temperature defines the ambient temperature for the power supply.
Results from such an installation:
Power supply is placed in the middle of the box, no other heat producing equipment inside the box
Enclosure: Rittal Typ IP66 Box PK 9519 100, plastic, 180x180x165mm
Load: 24V, 16A (=80% of the rated load); load is placed outside the box
Input: 600Vdc
Temperature inside enclosure: 54.9°C (in the middle of the right side of the power supply with a distance of 2cm)
Temperature outside enclosure: 22.6°C
Temperature rise: 32.3K
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