PMF-24V240WCXX Datasheet, PDF (13/14 Pages) Delta Electronics, Inc. – Built-in Active PFC and fan speed control

TECHNICAL DATASHEET
PMF Panel Mount Power
24V 240W 1
/ PMF-24V240WC□□
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. 5 Redundant Operation Connection Diagram
Step 3.
Connect the system load from 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. 6 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 (April 2017, Rev. 01)