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TECHNICAL DATASHEET
PMT Panel Mount Power Supply
36V 350W 1 Phase / PMT-36V350W1A
Operating Mode
Fig. 5
Redundancy / Parallel Operation Connection Diagram
Redundancy Operation
In order to ensure proper redundancy operation for the power supply unit (PSU), ensure that the output voltage difference between the
two units is kept at 0.36~0.40V for 36V supplies. Follow simple steps given below to verify:
Step 1.
Measure output voltage of PSU 1 and PSU 2. If PSU 1 is the master unit, then V
the output voltage, connect the power supply to 50% load and set the PSU 1 and PSU 2 output voltage.
Step 2.
Connect the right DRR module, 40A as per the system requirement to the power supply units PSU 1 and PSU 2 at V
respectively.
Step 3.
Connect the system load from V
supply) – V
* (in DRR module).
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Parallel Operation
These DRR modules can also be used for Parallel function in order to increase the output power by N+1 (e.g. 2.5A + 2.5A = 5A or 2.5A
+ 2.5A + 2.5A = 7.5A) or current sharing, and thus increasing the power supply and system reliability. Though the
PMT-36V350W1A☐ is not designed for current sharing, a good current sharing between two power supplies can be achieved by
following simple steps as below (Refer to Fig. 5 for the Connection Diagram).
Step 1.
Set output load condition for both supplies at 50% and measure
the output voltages.
Step 2.
Adjust output voltages to the same level or within ±25mV
difference.
*V
will vary from 0.60V to 0.90V (Typical 0.65V) depending on the load current and surrounding air temperature.
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All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
13
www.DeltaPSU.com (April 2015, Rev. 01)
. Please note that output voltage V
out
□
of PSU 1 must be higher than PSU 2. In order to set
O
from DRR module will be = V
out
Step 3.
Connect PSU 1 and PSU 2 with the DRR-40A module and
measure at V
1 & V
2 to verify the voltage difference. Ensure
in
in
the voltages are within ±25mV.
Step 4.
Output voltage from DRR module V
voltage of power supply) – V
1 & V
in
(output voltage of power
O
will be = V
out
O
* (in DRR module).
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2
in
(output
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