DMS-30LCDA-4/20B Murata Power Solutions Inc, DMS-30LCDA-4/20B Datasheet - Page 4

• Manufacturer Part Number: DMS-30LCDA-4/20B
• Description: DATEL PANEL METERS
• Manufacturer: Murata Power Solutions Inc
• Type: Digital Process Monitorr

Specifications of DMS-30LCDA-4/20B

• Rohs Compliant: NO
• Equipment Type: Digital Process Monitor
• Input: + 20.4 mA
• Display Type: 3 - 1/2 Digit LCD
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

DMS-30LCDA-4/20P (Positive-Reading)
1. Set R3 fully counterclockwise (minimum offset position) and R7 fully
3. Desired display readings are:
The DMS-30LCDA-4/20P’s zero-offset circuit is optimized to produce
positive readings at both 4mA and 20mA input levels. As shown in
Table 4’s fi rst three columns, a 4mA input can be adjusted (using R3,
Zero/Offset Adjust) to display any positive reading between “000”
and “800.” The corresponding 20mA-input reading is then added to
the 4mA offset as a differential whose magnitude is varied by adjust-
ing R7 (Gain/Span Adjust).
The ‘Differential Range’ column in Table 4 lists the nominal dif-
ferential display-readings which can be obtained with R7 at, or very
close to, its full-clockwise, minimum span position. The ‘Differential
Range’ column can be used as a guide when confi guring the meter
for the majority of user applications. Higher differential ranges are
obtainable; however, the use of higher differential readings results
in correspondingly-lower positive readings with 4mA inputs, that
is, R3’s clockwise adjustment-range is reduced. Example #3 below
illustrates this point. Contact DATEL if there is any doubt as to
whether or not the DMS-30LCDA-4/20P can be confi gured for your
display-reading requirements.
The fi rst step when initially confi guring the DMS-30LCDA-4/20P, or
when selecting a new range, is to set R3 fully counterclockwise and
R7 fully clockwise (roughly 22 turns each) to their minimum offset
and minimum span positions, respectively.
The next step is to calculate the differential display-reading; this is
accomplished by subtracting the desired 4mA display reading from
the desired 20mA display reading, disregarding decimal points. Then,
using the calculated differential display-reading to select the appro-
priate DIP-switch setting # from Table 4, confi gure DIP-switches
SW1, SW2, and SW3 accordingly. Please note, positions SW4 and
SW5 are not used in positive reading ‘P’ models. Also, make certain
that the DIP-switch’s small actuators are fi rmly engaged in their fully
ON or fully OFF positions.
The example below describes how to calibrate the meter for an
application which the DMS-30LCDA-4/20P easily accommodates:
displaying the output of a 4-20mA transmitter, that is, “04.0” with a
4mA input and “20.0” with a 20mA input.
clockwise (minimum differential span position), roughly 22 turns.
Notice that these readings can be obtained using either DIP-switch
setting #1 or DIP-switch setting #2 in Table 3. In situations like this
where DIP-switch settings overlap, less-sensitive R3/R7 adjustments
can be achieved if the higher DIP-setting # is selected (setting #2
in this example). Apply 12mA and adjust R3 so the display reads
“000.” Apply 20mA and adjust R7 so the display reads “650.” Apply
4mA and verify that the display reads “-650.” Repeat adjustments if
necessary.
4mA = "–650"
20mA = "650"
1
2
3
4
ON
5
www.murata-ps.com/dpm
6
7
8
Examples (DMS-30LCDA-4/20P, Positive Reading)
1. Desired display readings are:
2. Desired display readings are:
Loop-Powered, 1.8V Drop, 4-20mA Process
Table 4.
2. Subtract 040 from 200 to yield a differential-reading value of 160;
3. Set the transmitter’s output to 4.0mA and carefully adjust R3 clock-
4. Set the transmitter’s output to 20.0mA and adjust R7 counterclock-
5. Set the transmitter back to 4.0mA and slowly adjust R3 clockwise
1. 800 to 1400
2. 500 to 800
3. 350 to 500
4. 250 to 350
5. 150 to 250
* Setting SW5 to On will increase the differential range.
Use DIP-switch setting #4 in Table 4 since subtracting 650 from 950
yields a differential value of 300. Apply 4mA and adjust R3 until the
display reads “000.” Apply 20mA and adjust R7 until the display
reads “300” (the differential value previously calculated). Apply 4mA
and adjust R3 until the display reads “650.” Apply 20mA and verify
that the display reads “950.”
This example illustrates the DMS-30LCDA-4/20P’s capability to
display higher differential readings than those indicated in Table
4. This example also illustrates how the DMS-30LCDA-4/20P can
be used to display the output levels of a 4-20mA transmitter with
higher precision (0.01mA versus 0.1mA) than the example previ-
ously described.
Subtracting 400 from 1999 yields a differential of 1599, a value
not listed in Table 4. However, use DIP-switch setting #1 in Table
4 and enable SW5 since this setting has the highest overall offset/
span adjustment capabilities. Enable DP2 via SW7, then apply 4mA
and adjust R3 so the display reads “0.00.” Apply 20mA and adjust
R7 so the display reads “15.99.” Apply 4mA and adjust R3 until the
display reads “4.00.” Apply 20mA and check to see that the display
reads “19.99” or just overranges (“1—”). Repeat adjustment
procedure if necessary.
See example 2 below.
use this value to select DIP-switch setting #5 in Table 4. Enable
decimal point DP3 by placing SW8 to the ON position.
wise until the meter’s display reads “000.”
wise until the meter’s display reads “16.0.”
until the display reads “04.0.” Reapply 20.0mA and the display
should now read “20.0.” Repeat steps 3, 4, and 5 to make sure the
adjustments did not affect one another.
Desired Display Readings
Diff. Range
DMS-30LCDA-4/20 Series
Monitors with Full-Size LCD Displays
4mA ="650"
20mA = "950"
4mA =" 4.00"
20mA = "19.99"
DMS-30LCDA-4/20P (Positive Reading)
DIP Switch Settings
4mA
900
850
800
750
750
20mA
1700
1350
1150
1000
19 Jan 2011 MPM_DMS30-LCDA.B05 Page 4 of 6
900
SW1
Off
On
Off
Off
On
1
1
2
SW2
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Off
Off
On
Off
On
2
3
3
4
ON
SW3
Off
Off
Off
On
On
4
ON
5
5
6
SW4
NA
NA
NA
NA
NA
6
7
7
8
SW5*
OFF
OFF
OFF
OFF
OFF
8