DRM-24V80W1PN Datasheet, PDF (18/20 Pages) Delta Electronics, Inc. – Built-in active PFC and up to 90% efficiency

TECHNICAL DATASHEET
CliQ M DIN Rail Power Supply
24V 81.6W 1 Phase / DRM-24V80W1PN
Fig. 10 Series Operation Connection Diagram
 Series Operation
Delta's CliQ M can be connected in series to increase the output voltage as shown in figure above. Power supply from the same
product series only be used and with the same rated output current. The maximum load current should not exceed the smallest rated
output current. Any number of power supplies can be connected in series, user must note that output voltage > 60Vdc will not meet
SELV requirements and could be dangerous to user, the total voltage shall not exceed 150Vdc. Installation a protection against the
touching is a must and connect the output ground to earth when output voltage is not SELV. A diode in reverse bias must be added
across output terminals of each power supply, this is to prevent -V voltage being applied to other power supply in fault conditions such
as short circuit across load. During short circuit -V1 & +V1 will come across +V2 & -V2 which means connecting 2 power supplies in
opposite polarity and may cause damage to power supply. With reverse bias diodes in place the voltage across each power supply will
be restricted to one diode drop – approximately 0.7V to 1.0V. It is recommended to provide sufficient de-rating for diodes use 2 times
the voltage rating of series output voltage. E.g. the two 24V power supplies are connected in series, the total voltage is 48 volts. Hence,
recommended to use diodes with reverse voltage rating of 2x48=96 volts. Therefore diodes with reverse voltage rating of 100 volts can
be used.
During the short circuit condition, the current through diodes will be large, hence it is recommended that diodes to be least twice the
current rating of the power supply.
The turn ON would be non-monotonic as the
power supply with the fastest startup time and rise
time will turn on first. As a result, the startup
waveform with 2 power supplies connected in
series would see a step.
User must consider to verify parameters such as
EMI, inrush current, leakage current, PARD, start
up time would differ from datasheet numbers as
multiple power supplies in series.
18
All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (May 2016, Rev. 00)