B MDM45 Digital Loop Monitor SWICHGAGE Instructions for Installation and Operation

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B MDM45 Digital Loop Monitor SWICHGAGE Instructions for Installation and Operation | Manualzz

MDM45 Digital Loop Monitor SWICHGAGE

®

Instructions for Installation and Operation

Please read the following information before installing

.

A visual inspection for any damage which may have occurred during shipping is recommended. It is your responsibility to have a qualified person install the unit, and make sure it conforms with NEC and local codes.

GENERAL INFORMATION

MDM-9114N

Revised 06-97

Section 05

(00-02-0160)

B

®

FRANK W.

Made in USA

MFR.

®

WARNING

®

BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT

✔ Disconnect all electrical power to the machine.

✔ Make sure the machine cannot operate during installation.

✔ Follow all safety warnings of the machine manufacturer.

✔ Read and follow all installation instructions.

Approved * for

Class I, Division 2,

Group D Hazardous

Locations

LOW

TRIP PT

MDM45

DISPLAY

HIGH

TRIP PT

Description

The MDM45 is a 4-1/2 in. (114 mm) dial digital loop monitor with low and high trip points which are adjustable over the full range of the monitor. A toggle switch and a push button are provided in the face of the monitor for easy access to the trip point adjustments. The MDM45 accepts one 4-20 mA transmitter input. It is designed to operate from 12 or 24 VDC systems.

Mounting

PUSH TO READ

TRIP POINT

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WARNING: Disable the engine (motor) so it can NOT start.

Remove the battery ground cable (when applicable).

(1 mm) to 1/8 in. (3 mm) thick. We recommend to install the MDM45 within a

Specifications

Accuracy: ±1.0% of full scale.

Operating Temperature Range: 32 to 155°F (0 to 70°C).

mounting. Three (3) screw holes 1/4 in. (6 mm) are also needed to secure

Storage Temperature: -40 to 300°F (-40 to 150°C).

Case Material: Aluminum.

Display Range: -10,000 to 19,999.

Signal Input: 4–20 mA.

Input Resistance: 250 Ohms.

Display Update Time: 0.5 seconds.

Power Input: 1.8 watts @ 12 VDC; 3.6 watts @ 24 VDC.

Group D, hazardous areas. Digital loop monitor input 10–30 VDC, 4–20 mA.

Pr k f

point. Trip points can be selected to open or close, (0.5 A @ 250 VDC).

the unit to the panel (See mounting diagram).

With a straight edge screwdriver remove the three (3) screws located in the

or A

Trip Point Output: A power FET switch turns on when signal reaches the trip

NOTE: A minimum distance of 12 in. (305 mm) from any ignition coil or coil leads should be maintained.

Mounting Dimensions

oduct Discontinued

NOTE: MDM45 is for use with Electromechanical TATTLETALE ® ators or SELECTRONIC ® annuncior similar solid-state annunciators.

About Trip Points

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During normal operation, both trip points are always active and are independent of the trip point selector switch. When the transmitter signal meets the

2-39/64 in.

(66 mm) radius

120

1/4 in.

(6 mm) dia.

3 holes panel side view high or low trip point, that trip point is triggered: the trip point output “turns on”, and an LED light to indicate the output is ON.

weatherproof enclosure to protect it from rain, dust, etc.

A round mounting hole size 4-3/4 in. (121 mm) diameter is needed for the

Open Transmitter Input

An open transmitter input causes the SWICHGAGE ® ing the low trip point if the trip point is being used.

to go negative, trigger-

Warranty

A two year limited warranty on materials and workmanship is provided with this

Murphy product. Details are available on request and are packed with each unit.

Installation Accessories

● Straight edge screw driver (medium).

Wire cutters, wire stripping and terminal crimping tool.

Potentiometer trimmer or small screwdriver with plastic handle.

4–20 mA simulator.

DC power supply (10–30 VDC, 150 mA minimum).

INSTALLATION

Typical Wiring

WARNING: Perform this operation with the power source OFF.

1. Connect a ground wire to the NEG terminal of the MDM45 (Fig. 1).

2. Connect a wire from the NEG terminal to the TP1 negative (-) terminal.

3. Connect a wire from the TP1 negative (-) to the TP2 negative (-) terminal.

4. Connect DC power source positive (+) to the 12/24 positive (+) terminal.

5. Connect TP1 and TP2 positive terminals (+) to the annunciator, shutdown device, or DC load such as a relay coil.

6. Using shielded cable, connect the 4-20 mA input signal negative terminal (-) to the transmitter input positive terminal (+) of the MDM45. For separate transmitter power source (Fig. 2), connect the 4-20 mA input signal negative (-) to the transmitter input negative terminal (-).

7. Connect the transmitter input negative terminal (-) to NEG terminal. For separate transmitter power source, using shielded cable connect the transmitter input negative terminal (-) to 4-20 mA input negative terminal (-).

decimal point position, (Item B, Figure 3).

Switch “1” on = Four (4) decimal digits (.0000 - 1.9999)

Switch “2” on = Three (3) decimal digits (0.000 - 19.999)

Switch “3” on = Two (2) decimal digits (00.00 - 199.99)

Switch “4” on = One (1) decimal digit (000.0 - 1999.9)

Switch “5” on = No decimal digit (0000 - 19999)

4. Connect the 4–20 mA source to the transmitter input terminal as shown in

Figure 2 below, left.

5. Set current source to 20 mA and rotate coarse span potentiometer R9

(Item H, Figure 3) clockwise until display indicates approximately the maximum range.

6. Fine tune the setting with R44 fine span potentiometer (clockwise to increase ).

7. Set current source to 4 mA and rotate coarse zero potentiometer R24

(Item G, Figure 3) clockwise until display reads near zero.

8. Fine tune the setting with R45 fine zero potentiometer (clockwise to increase).

9. Switch current source back to 20 mA. Observe display and adjust coarse span or fine span potentiometer until display indicates the desired value.

10. Set current source to 4 mA observe display and adjust coarse zero or fine zero 8. Using shielded cable connect 4-20 mA input signal positive (+) to the 12/24 positive terminal (+). For a separate transmitter source, connect the 4-20 potentiometer until zero is displayed. Repeat steps 5 thru 10 if necessary.

mA input signal positive (+) to the transmitter input positive terminal (+).

12/24 VDC

L

12/24

NEG

NC

4-20 mA

Signal

NOTE: Transmitter may not be perfectly calibrated to provide 4 mA at zero input or 20 mA at maximum input. If this is the case it may be desirable to adjust the monitor to match the transmitter or recalibrate transmitter.

Figure 3:

A. Trip point display toggle switch.

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1 2 3

B

Front View

4 5

Side

View

ON

Transmitter Input

Terminal Block

L =LOAD

B. Decimal point adjustments.

L

C. Trip point potentiometers.

E

NOTE: Loads must not exceed

0.5 A @ 250 VDC.

All grounds (-) must be common.

MDM45

Back view

Figure 1:

Common Transmitter Power Source

D. LED trip point indication lights.

E. Readout digital display.

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fine zero adjustments.

H. High limit range coarse and

C

D

A

F

12/24 VDC

L =LOAD

L

L

12/24

NEG

NC

MDM45

Signal

Transmitter Input

Terminal Block

NOTE: Loads must not exceed

0.5 A @ 250 VDC.

All grounds (-) must be common.

Figure 2:

Back view

Separate Transmitter Power Source

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Calibration Procedures

(rotate clockwise to increase value).

G

H

R44

Trip Point

or A

1. Start engine or power up the monitor.

R45

2. Set trip point display toggle switch to “Low Trip PT” potentiometer.

3. Press “Push To Read” trip point button to read the low trip point.

4. While depressing the “Push To Read” button, rotate the “Low Trip PT” potentiometer until the LCD display indicates the desired low trip point

1. Connect 10 VDC to 30 VDC power to power input terminal 10-30 Vdc

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4-20 mA fine span adjustment.

R24

R9

oduct Discontinued

6. Press “Push To Read” trip point button to read the high trip point.

and negative as shown in wiring diagrams. (Observe polarity).

2. Remove the plugs from front panel for access to decimal point selector switch, zero and span potentiometers (Items B, G and H, Figure 3).

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7. While depressing the “Push To Read” button, rotate the “High Trip PT” potentiometer until the LCD display indicates the desired high trip point

(rotate clockwise to increase value).

In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.

C

D

FRANK W.

®

Since 1939 MFR.

Frank W. Murphy Manufacturer

P.O. Box 470248; Tulsa, Oklahoma 74147; USA

tel. (918) 627-3550 fax (918) 664-6146

e-mail [email protected]

Frank W. Murphy Southern Division

P.O. Box 1819; Rosenberg, Texas 77471; USA

tel. (281) 342-0297 fax (281) 341-6006

e-mail [email protected]

Frank W. Murphy, Ltd.

Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.

tel. +44 1722 410055 fax +44 1722 410088 tlx 477088

e-mail [email protected]

Frank W. Murphy Pte., Ltd.

26 Siglap Drive; Republic of Singapore 456153

tel. +65 241-3166 fax +65 241-8382

e-mail [email protected]

Murphek Pty., Ltd.

1620 Hume Highway; Campbellfield, Vic 3061; Australia

tel. +61 3 9358-5555 fax +61 3 9358-5558

Murphy de México, S.A. de C.V.

Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje

San Luis Potosí, S.L.P.; México 78384

tel. +52-48-206264 fax +52-48-206336

e-mail [email protected]

Murphy Switch of California

P.O. Box 900788; Palmdale, California 93590; USA

tel. (805) 272-4700 fax (805) 947-7570

e-mail [email protected]

Frank W. Murphy France

tel. +33 1 30 762626 fax +33 1 30 763989

Printed in U.S.A.

0791157

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