DRL-24V120W1AX Datasheet, PDF (14/15 Pages) Delta Electronics, Inc. – Universal AC input voltage

TECHNICAL DATASHEET
LYTE DIN Rail Power Supply
24V 120W 1 Phase / DRL-24V120W1A□
Operating Mode
 Redundant Operation
In order to ensure proper redundant operation for the
power supply units (PSUs), the output voltage difference
between the two units must be kept at 0.45~0.50V for
these 24V supplies. Follow simple steps given below to
set them up for the redundant operation:
Step 1.
Measure output voltage of PSU 1 and PSU 2. If PSU 1 is
the master unit, then VO of PSU 1 must be higher than
PSU 2. In order to set the output voltage, individually
connect each power supply to 50% of rated load at any
line voltage from 85-264Vac, and set the PSU 1 and PSU
2 output voltage.
Step 2.
Connect the power supply units PSU 1 and PSU 2 to Vin
1 & Vin 2, respectively, of the DRR-20N (or 20A) module
shown on the right of above diagram.
Fig. 3 Redundancy Operation Connection Diagram
Step 3.
Connect the system load to Vout. Please note that output voltage Vout from DRR module will be = VO (output voltage of power supply) –
Vdrop* (in DRR module).
*Vdrop will vary from 0.60V to 0.90V (Typical 0.65V) depending on the load current and surrounding air temperature.
 Parallel Operation
The power supply units (PSUs) can also be used for parallel
operation in order to increase the output power. The
difference in output voltage between the two units must be
kept to within 25mV of each other. This difference must be
verified with the same output load connected independently
to each unit.
Parameters such as EMI, inrush current, leakage current,
PARD, start up time will be different from those on the
datasheet, when two units are connected in parallel. The
user will need to verify that any differences will still allow the
two power supplies connected in parallel will work properly in
their product/application.
Fig. 4 Parallel Operation Connection Diagram
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All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2016, Rev. 01)