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3. Model Selection & Energy Conservation: In order to achieve the lowest
possible energy consumption, be sure to determine your application’s total
current requirements. This is especially true when using DMS-PS-CM
supplies to power DATEL’s energy-efficient LED and/or LCD display digital
panel meters (DPMs) and process monitors. In general, choose a power
supply that will accommodate your maximum current consumption plus a
20% margin. Choosing the lowest-wattage model suitable for a given appli-
cation will provide lower procurement costs and lower long-term operating
costs.
When calculating total current requirements in installations employing
three or more DMS-Series meters, it is acceptable practice to use each
meter’s typical current consumption rating. However, be sure to consult
the relevant product datasheets for all instrumentation comprising your
application.
For applications where DMS-PS-CM power supplies will be powering only
Murata Power Solution’s DPM’s, a 5-Watt DMS-PS3-CM can power up
to four, standard intensity (‘-RS’ suffix) red-LED DMS-30PC meters: two
meters on V1, and one meter each on V2 and V3. The same DMS-PS3-CM
could also be used to power over 40 low-power red DMS-30PC meters
(‘-RL’ suffix), or over 800 DMS-30LCD non-backlit meters! Of course, these
statements are made without regard to ground-loop problems that may be
encountered when powering 800 DPM’s from a single power supply.
Application Information
1. Chassis Mounting Considerations: In order to minimize self-heating,
DMS-PS-CM power supplies should always be mounted in either a
vertical or horizontal position. Avoid mounting units upside-down or in
close proximity to other heat-generating devices. Also, be sure to use
the mounting hardware described in Figure 4 below in order to ensure
a secure, vibration-resistant installation.
Figure 4. Chassis Mounting
2. Bipolar Operation (See Figure 5): DMS-PS-CM power supplies’ fully
isolated outputs allow for the generation of bipolar (positive and nega-
tive) supply voltages. Bipolar outputs can be used to power dual-supply
operational amplifiers, as well as any other type of instrumentation that
requires bipolar supply voltages. However, please keep in mind that
when connecting and operating any two outputs in this fashion, each
output retains its maximum current rating.
COM
+24V –5V +5V
– +– +– +
V1 V2
DMS-PS6-CM
V3
Figure 5. Bipolar Connections
Figure 6. Measuring Ripple and Noise
Panel/Chassis
Threaded
Hole
Screw,
Split Lock Washer,
Flat Washer
Panel/Chassis
Hole
Flat Washer,
Split Lock Washer,
Nut
Screw,
Flat Washer
Oscilloscope
BW = 20MHz
DMS-PS-CM
V1
+
–
Scope Probe
DMS-PS-CM Series
High Efficiency, AC/DC Instrumentation Power
Supplies with Individually Isolated Outputs
MPM_DMS-PS-CM_B01 Page 5 of 8