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.B02 Page 5 of 8

www.murata-ps.com