Murphy DT9804, DT9803, DT9805, DT9806 User Manual

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SELECTRONIC® Digital Tachometer/TACHSWICH™

Installation Instructions

DT9800 Series

DT-8605N

Revised 07-97

Section 20

(00-02-0180)

®

Please read the following information before installing. A visual inspection of this product for damage during shipping is recommended before mounting. It is your responsibility to have a qualified person install this unit and make sure installation conforms to NEC and local codes.

GENERAL INFORMATION

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.

*

*

Class I,

Division 2,

Group D

Description

The Digital SELECTRONIC® DT9800 series features a tachometer-only and tachometer with built-in overspeed switch. These tachometers are highly accurate and dependable due to digital solid-state electronics and a quartz crystal time base. The surface-mount enclosure makes it easy to install. Tachometer power and RPM data are supplied by a magnetic pickup or capacitor discharge (CD) ignition–depending on model chosen. The RPM data is converted and displayed on a four digit, easy-to-read liquid crystal display (LCD). The LCD displays up to 9999 RPM.

The DT9803 and DT9804 are tachometer-only models. The DT9803 is powered by a magnetic pickup. The DT9804 is powered by a CD ignition.

The TACHSWICH™ models, DT9805 and DT9806, combine a digital tachometer and overspeed switch. The DT9805 is powered by a magnetic pickup and the DT9806 is powered by a CD ignition.

Specifications

Input Signal Source

DT9803: 18 to 112 volts peak to peak or 3.5 to 40 Vrms. DT9805: 18 to 112 volts peak to peak or 7 to 40 Vrms. DT9804 and DT9806: 90 to 400 VDC, CD ignition.

Temperature Range: -4 to 158°F (-20 to 70°C).

Accuracy: ±1 RPM.

Frequency Range:

DT9803 and DT9805: 1 to 15 KHz.

DT9804 and DT9806: 3 to 666 Hz.

Overspeed Switch Rating (DT9805 and DT9806 only):

SCR output. 5 A @ 400 VDC.

*Class I, Div. 2, Group D Hazardous Locations. Models DT9803 and DT9805 magnetic pickup powered 18 to 112 Vpp input. Models DT9804 and DT9806 used with CD ignition. Contact Murphy for details. The equipment must be installed in a suitable enclosure accepted by local authorities.

MOUNTING

1.Before installing, be sure there will be enough clearance to access the calibration rocker switches and overspeed switches from the back of the panel.

2.Drill mounting holes according to the dimensions below.

3.Be sure the gasket is in place on the back of the tachometer before installing. Insert the tachometer from the front of the panel aligning the mounting studs with the appropriate holes. Secure the tachometer using the four 6/32 nuts, but do not overtighten the nuts as case damage could occur.

Mounting Hole Dimensions

 

 

Back View

 

 

Tachometer

Gasket

Panel

Calibration Rocker

Overspeed

4 in.

 

 

Switches

Switches**

 

 

 

 

 

(102 mm)

2 in.

 

 

 

 

 

(51 mm)

 

 

 

 

3-1/8 in.

2 in.

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

3

4

5

6

7

8

9 10 11 12

 

(79 mm)

(51 mm)

 

 

 

 

 

OPEN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

diameter

8

0

2

 

 

8

0

2

8

0

2

 

9

1

 

 

 

9

1

 

9

1

 

 

7

 

 

3

 

7

 

 

3

7

 

 

3

 

6

5

4

 

 

 

6

5

4

 

6

5

4

 

 

3-1/2 in.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(89 mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

3/16 in (5 mm)

Wiring

diameter, 4 places

Terminals

 

1

**Applies to overspeed models only.

Murphy DT9804, DT9803, DT9805, DT9806 User Manual

DT9803 AND DT9804 TYPICAL WIRING

WARNING: PERFORM THE WIRING INSTALLATION WITH THE POWER SOURCE OFF. DO NOT ROUTE TACHOMETER LEADS WITH PRIMARY IGNITION WIRING.

DT9803

Connect the magnetic pickup cable conductors to the MPU terminal as shown in Figure 1. Use a two conductor shielded cable between the DT9803 and the magnetic pickup.

Figure 1: DT9803 typical wiring

 

MPU

 

Back of

Flywheel

DT9803

 

2 Conductor

Shielded Cable

Belden or Magnetic Pickup

Equivalent

DT9804

Before wiring the DT9804, determine the output voltage and ground polarity of the ignition. Table 1 lists the Peak Output Voltage and Ground Polarity of some common ignitions.

Connect the DT9804 tachometer to the CD ignition. Figure 2 shows a typical wiring diagram for negative ground ignition system.

Figure 2: DT9804 typical wiring for negative ground ignition

150-90

400-150

NEG

Back of

DT9804

 

 

 

 

 

 

Negative Ground Ignition

Optional Connection for

 

150-400 V Ignitions

 

Table 1: Output Voltage & Polarity of Common CD Ignitions

Ignition

Ground

Peak Output

Use Figure

MFG & Series

Polarity

Voltage

 

 

 

 

 

Altronic I, III, & V

Negative

120

6

 

 

 

 

Altronic II

Positive

350

7

 

 

 

 

Bendix S-1800, BLAR

Negative

250

6

 

 

 

 

Bendix Side-winder

Positive

300

7

 

 

 

 

Fairbanks Morse SCSA

Positive

180

7

 

 

 

 

Fairbanks Morse

Negative

225

6

3000 & 9000

 

 

 

American Bosch Magtronic

Negative

165

6

 

 

 

 

DT9805 AND DT9806 TYPICAL WIRING

WARNING: PERFORM THE WIRING INSTALLATION WITH THE POWER SOURCE OFF. DO NOT ROUTE TACHOMETER LEADS WITH PRIMARY IGNITION WIRING.

DT9805

1.Connect the magnetic pickup as shown in Figure 3.

2.Connect the overspeed switch wiring as shown Figures 3 and 4. Observe the polarity of the overspeed switch. The positive terminal must be connected to the positive side of the circuit as shown.

3.If connecting to a Murphy LCDT annunciator refer to Figure 5. See General Catalog for more information on the LCDT.

Figure 3: DT9805 typical wiring for negative ground ignition

SWICHGAGE®

Back of

 

DT9805

 

MPU

OS

NEG

POS

2 Conductor

 

Shielded Cable

 

Belden or

 

Equivalent

To Magnetic Pickup

 

 

 

Connected to

 

307-PH-CD

Corresponding Numbers

 

On Terminal Block Below

 

TATTLETALE®

 

 

 

4

5

Pressure

Overspeed

 

Level

1

 

2

 

3

1 G 2

3

 

 

 

 

 

 

 

Emergency

 

 

 

 

Stop Switch

 

SW

 

 

Frame

 

 

 

 

 

ALT 2

 

 

Ground

ALT 1

 

 

 

 

 

 

 

 

GRD

 

 

 

 

 

 

 

 

Adapter

1

2

3

4

5

6

7

8

Package

 

 

 

 

 

 

 

 

Connect to

Good Engine

Ground

To Negative Ground

CD Ignition

2

Figure 4: DT9805 typical wiring for positive ground ignition

 

 

 

Connected to

 

 

307-PH-CD

Corresponding Numbers

 

On Terminal Block Below

SWICHGAGE®

TATTLETALE®

 

 

 

4

5

Pressure

Overspeed

Level

 

1

 

2

3

 

1 G 2

3

 

 

 

Back of

DT9805

MPU

OS

POS

NEG

2 Conductor

 

Shielded Cable

 

Belden or

 

Equivalent

To Magnetic Pickup

Emergency

Stop Switch

SW

Frame

 

ALT 2

Ground

ALT 1

 

 

 

 

 

 

 

 

GRD

 

 

 

 

 

 

 

 

Adapter

1

2

3

4

5

6

7

8

Package

 

 

 

 

 

 

 

 

Connect to

Good Engine

Ground

To Positive Ground

CD Ignition

Figure 5:

Overspeed

 

 

 

DT9805 and DT9806

Switch Terminals

on DT9805 or DT9806

negative ground

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

connection to Murphy

 

 

 

 

 

 

 

 

 

LCDT (for positive ground

NEG

POS

 

 

ignitions, reverse the negative and positive wires on the tachometer so that

the positive terminal is grounded.)

Murphy LCDT

Annunciator

Terminal Block

46

50

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