Murphy DT9804, DT9803, DT9805, DT9806 User Manual
DT-8605N
®
®
Gasket
123456 789101112
OPEN
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9
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8
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2
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2
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7
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Calibration Rocker
Switches
Overspeed
Switches**
Wiring
Terminals
**Applies to overspeed models only.
4 in.
(102 mm)
2 in.
(51 mm)
3-1/2 in.
(89 mm)
2 in.
(51 mm)
3/16 in (5 mm)
diameter, 4 places
3-1/8 in.
(79 mm)
diameter
Tachometer
Panel
Revised 07-97
SELECTRONIC®Digital Tachometer/TACHSWICH™
Section 20
(00-02-0180)
Installation Instructions
DT9800 Series
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.
MOUNTING
1. Before installing, b
calibration rocker switches and overspeed switches from the back of
the panel.
2. Drill mounting holes according to the dimensions below.
Mounting Hole Dimensions
e sure there will be enough clearance to access the
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.
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.
Back View
1
1 G2 3
SW
ALT 2
ALT 1
GRD
Pressure Overspeed Level
123
12345678
45
To Negative Ground
CD Ignition
Adapter
Package
Emergency
Stop Switch
Frame
Ground
Connected to
Corresponding Numbers
On Terminal Block Below
307-PH-CD
TATTLETALE
®
Connect to
Good Engine
Ground
2 Conductor
Shielded Cable
Belden or
Equivalent
To Magnetic Pickup
NEG
POS
MPU OS
Back of
DT9805
SWICHGAGE
®
DT9803 AND DT9804 TYPICAL WIRING
1 G2 3
SW
ALT 2
ALT 1
GRD
Pressure Overspeed Level
123
12345678
45
To Positive Ground
CD Ignition
Adapter
Package
Emergency
Stop Switch
Frame
Ground
Connected to
Corresponding Numbers
On Terminal Block Below
307-PH-CD
TATTLETALE
®
Connect to
Good Engine
Ground
2 Conductor
Shielded Cable
Belden or
Equivalent
To Magnetic Pickup
POS
MPU OS
NEG
Back of
DT9805
SWICHGAGE
®
Magnetic Pickup
2 Conductor
Shielded Cable
Belden or
Equivalent
Back of
DT9803
Flywheel
MPU
Optional Connection for
150-400 V Ignitions
Negative Ground Ignition
90-150
NEG
150-400
Back of
DT9804
Ignition
MFG & Series
Ground
Polarity
Peak Output
Voltage
Use Figure
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
3000 & 9000
Negative 225 6
American Bosch Magtronic
Negative 165 6
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
Table 1:
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:
Output Voltage & Polarity of Common CD Ignitions
DT9804 typical wiring for negative ground ignition
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:
2
DT9805 typical wiring for negative ground ignition
Figure 4:
Figure 5:
DT9805 and DT9806
DT9805 typical wiring for positive ground ignition
Overspeed
Switch Terminals
on DT9805 or DT9806
negative ground
connection to Murphy
LCDT (for positive ground
ignitions, reverse the
negative and positive wires
on the tachometer so that
the positive terminal is grounded.)
NEG
POS
46
50
Murphy LCDT
Annunciator
Terminal Block
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