TECHNICAL DATASHEET
PMT Panel Mount Power Supply
36V 350W 1 Phase / PMT-36V350W1A
□
All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (April 2015, Rev. 01)
13
Operating Mode
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
O
of PSU 1 must be higher than PSU 2. In order to set
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
in
1 & V
in
2
respectively.
Step 3.
Connect the system load from V
out
. Please note that output voltage V
out
from DRR module will be = V
O
(output voltage of power
supply) – V
drop
* (in DRR module).
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).
*V
drop
will vary from 0.60V to 0.90V (Typical 0.65V) depending on the load current and surrounding air temperature.
Fig. 5 Redundancy / Parallel Operation 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.
Step 3.
Connect PSU 1 and PSU 2 with the DRR-40A module and
measure at V
in
1 & V
in
2 to verify the voltage difference. Ensure
the voltages are within ±25mV.
Step 4.
Output voltage from DRR module V
out
will be = V
O
(output
voltage of power supply) – V
drop
* (in DRR module).
