DT-8605N
Revised 07-97
Section 20
®
SELECTRONIC Digital Tachometer/TACHSWICH™
(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.
Class I,
Division 2,
Group D
✔ Make sure the machine cannot operate during installation.
✔ Follow all safety warnings of the machine manufacturer.
✔ Read and follow all installation instructions.
Description
Specifications
The Digital SELECTRONIC® DT9800 series features a tachometer-only and Input Signal Source
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.
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.
The DT9803 and DT9804 are tachometer-only models. The DT9803 is
powered by a magnetic pickup. The DT9804 is powered by a CD ignition.
Overspeed Switch Rating (DT9805 and DT9806 only):
SCR output. 5 A @ 400 VDC.
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.
*
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 3. Be sure the gasket is in place on the back of the tachometer before
calibration rocker switches and overspeed switches from the back of
the panel.
2. Drill mounting holes according to the dimensions below.
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
Mounting Hole Dimensions
Calibration Rocker
Switches
Overspeed
Switches**
Tachometer
Panel
Gasket
4 in.
(102 mm)
2 in.
(51 mm)
2 in.
(51 mm)
3-1/8 in.
(79 mm)
diameter
1
2
0
3
4
5
6
7
8
9
10 1112
OPEN
0
5
0
5
5
3-1/2 in.
(89 mm)
3/16 in (5 mm)
diameter, 4 places
Wiring
Terminals
1
**Applies to overspeed models only.
If connecting to a Murphy LCDT annunciator refer to Figure 5. See
General Catalog for more information on the LCDT.
DT9806
Before wiring the DT9806, determine the output voltage and ground
polarity of the ignition. Table 1 lists the Peak Output Voltage and Ground
Polarity of some common ignitions.
NOTE: When installing the DT9806 in a Murphy panel, always connect
the DT9806 to the ignition/input side of the power adapter. If the DT9806
input is connected to the output of the adapter, its display will read zero
RPM, since the adapter filters out the ignition pulses.
Figure 6 displays wiring to a negative ground ignition and Figure 7 for
positive ground units. If the ignition output voltage is 90-150 volts,
connect the ignition lead to the 90-150 input terminal on the DT9806; if it
is 150-400 volts, then connect the lead to the 150-400 terminal.
Figure 6: DT9806 typical wiring for negative ground ignition
Figure 7: DT9806 typical wiring for positive ground ignition
CALIBRATING THE DT9800 SERIES TO YOUR ENGINE
1. Locate the calibration switches on back of the unit (see page 1).
150 2-4-5-8-9
149 3-4-5-8-9
148 1-2-3-4-5-8-9
147 2-6-8-9
120 10
90 1-2-4-6-8-10
89 2-5-6-8-10
88 2-4-5-6-8-10
87 2-7-8-10
60 11
119 3-10
59 1-5-11
2. If calibrating the DT9804 and DT9806 advance to step 3. If calibrating
the DT9803 and DT9805, find the number of teeth for your gear in
Table 2. Close the series of calibration switches listed next to the
number of gear teeth.
58 1-2-6-11
57 2-3-5-6-11
56 1-4-7-11
118 1-4-10
117 1-3-4-10
116 1-5-10
146 1-3-6-8-9
145 4-6-8-9
86 2-4-7-8-10
85 1-2-5-7-8-10
84 1-2-4-5-7-8-10
83 3-6-7-8-10
82 3-4-6-7-8-10
81 1-2-3-5-6-7-8-10
80 9-10
115 2-3-5-10
114 1-2-4-5-10
113 6-10
112 1-3-6-10
111 2-4-6-10
110 1-2-3-4-6-10
109 3-5-6-10
108 1-4-5-6-10
107 2-3-4-5-6-10
106 3-7-10
55 1-3-4-5-7-11
54 2-5-6-7-11
53 1-2-3-8-11
52 2-3-4-5-8-11
51 1-3-5-6-8-11
50 1-3-4-7-8-11
49 2-3-6-7-8-11
48 9-11
47 1-2-4-5-9-11
46 4-5-6-9-11
45 1-3-5-7-9-11
44 3-5-6-7-9-11
43 1-3-5-8-9-11
42 1-2-3-5-6-8-9-11
41 1-2-4-5-7-8-9-11
40 10-11
39 1-2-3-6-10-11
38 1-5-7-10-11
37 1-3-4-5-6-7-10-11
36 1-2-4-6-8-10-11
35 1-2-4-5-7-8-10-11
34 1-2-3-4-9-10-11
33 2-3-7-9-10-11
144 1-2-4-6-8-9
143 2-3-4-6-8-9
142 1-5-6-8-9
141 3-5-6-8-9
140 1-2-3-5-6-8-9
139 2-4-5-6-8-9
138 1-3-4-5-6-8-9
137 7-8-9
1
2
3
4
5
6
7
8
9 10 1112
Calibration
Switches
Pushed
“ON”
(closed)
79 2-4-9-10
78 3-5-9-10
77 2-3-4-5-9-10
76 4-6-9-10
OPEN
136 3-7-8-9
Side View
135 1-2-3-7-8-9
134 1-2-4-7-8-9
133 2-3-4-7-8-9
132 1-5-7-8-9
131 1-3-5-7-8-9
130 1-4-5-7-8-9
129 3-4-5-7-8-9
128 6-7-8-9
105 1-4-7-10
104 1-2-3-4-7-10
103 1-3-5-7-10
102 2-4-5-7-10
101 6-7-10
75 1-2-5-6-9-10
74 2-3-4-5-6-9-10
73 2-4-7-9-10
72 1-3-5-7-9-10
71 1-6-7-9-10
70 2-3-4-6-7-9-10
69 2-4-5-6-7-9-10
68 4-8-9-10
DO NOT USE A PENCIL TO PUSH SWITCHES
3. To set the calibration code on the DT9804 and DT9806, refer to Table 3.
Find the line that matches your engine's cylinders and cycles and set the
DT9804/DT9806 according to the switches marked “ON”.
100 2-3-6-7-10
99
98
97
96
95
94
93
92
91
1-3-4-6-7-10
1-2-5-6-7-10
4-5-6-7-10
8-10
1-2-3-8-10
2-3-4-8-10
1-3-5-8-10
3-4-5-8-10
1-2-6-8-10
127 3-6-7-8-9
126 4-6-7-8-9
125 3-4-6-7-8-9
124 1-2-3-4-6-7-8-9
123 3-5-6-7-8-9
122 4-5-6-7-8-9
121 3-4-5-6-7-8-9
67 1-3-5-8-9-10
66 1-2-6-8-9-10
65 1-5-6-8-9-10
64 7-8-9-10
NOTE: if the ignition system has two energy storage capacitors, count only
half the actual number of engine cylinders for the calibration code.
63 1-2-3-4-7-8-9-10
62 1-2-3-4-5-7-8-9-10 32 8-9-10-11
61 1-2-3-4-6-7-8-9-10
Table 2: DT9803 and DT9805 Calibration Chart
Number
of Gear
Teeth
Number
of Gear
Teeth
Number
of Gear
Teeth
Number
of Gear
Teeth
Close Switch
Number(s)
Close Switch
Number(s)
Close Switch
Number(s)
Close Switch
Number(s)
Table 3: Calibration Code for DT9804 and DT9806
Number of
Cylinders
Number of
Cycles
Calibration Switch Code
250 2-3-5-6-7-8
249 1-2-3-5-6-7-8
248 4-5-6-7-8
247 1-4-5-6-7-8
246 2-4-5-6-7-8
245 1-2-4-5-6-7-8
244 3-4-5-6-7-8
243 1-3-4-5-6-7-8
242 2-3-4-5-6-7-8
241 1-2-3-4-5-6-7-8
225 1-5-9
200 1-2-5-6-9
199 1-3-5-6-9
198 2-3-5-6-9
197 4-5-6-9
196 1-4-5-6-9
195 1-2-4-5-6-9
194 1-3-4-5-6-9
193 2-3-4-5-6-9
192 7-9
175 1-2-3-4-5-7-9
174 1-6-7-9
1
2
3
4
5
6
7
8
9
10 11 12
224 2-5-9
223 3-5-9
173 1-2-6-7-9
172 1-3-6-7-9
171 1-2-3-6-7-9
170 1-4-6-7-9
169 3-4-6-7-9
168 2-3-4-6-7-9
167 5-6-7-9
1
2
2
3
4
4
5
5
6
6
8
8
10
12
16
2
2
4
2
2
4
2
4
2
4
2
4
4
4
4
ON ON
222 1-3-5-9
221 2-3-5-9
220 2-3-5-9
219 1-4-5-9
218 2-4-5-9
217 1-2-4-5-9
216 3-4-5-9
215 2-3-4-5-9
214 1-2-3-4-5-9
213 6-9
ON ON
ON ON
ON
ON ON
191 2-7-9
166 2-5-6-7-9
165 3-5-6-7-9
164 1-2-3-5-6-7-9
163 1-4-5-6-7-9
162 1-2-4-5-6-7-9
161 2-3-4-5-6-7-9
160 8-9
ON ON
ON
240
9
190 1-2-7-9
189 1-3-7-9
188 1-2-3-7-9
187 1-4-7-9
186 2-4-7-9
185 3-4-7-9
184 2-3-4-7-9
183 5-7-9
182 2-5-7-9
181 1-2-5-7-9
180 1-3-5-7-9
179 1-2-3-5-7-9
178 1-4-5-7-9
177 1-2-4-5-7-9
176 1-3-4-5-7-9
ON
ON
ON ON
ON ON
239 1-9
238 2-9
237 1-2-9
236 3-9
ON
ON
212 2-6-9
ON
211 1-2-6-9
210 1-3-6-9
209 2-3-6-9
208 1-2-3-6-9
207 1-4-6-9
206 2-4-6-9
205 3-4-6-9
204 1-3-4-6-9
203 1-2-3-4-6-9
202 5-6-9
ON
235 1-3-9
234 1-2-3-9
233 4-9
232 1-4-9
231 2-4-9
230 1-2-4-9
229 3-4-9
228 1-3-4-9
227 1-2-3-4-9
226 5-9
159 2-8-9
ON ON
ON ON
158 1-3-8-9
157 1-2-3-8-9
156 2-4-8-9
ON ON
ON
ON
155 3-4-8-9
154 1-2-3-4-8-9
153 1-5-8-9
ON ON
3
152 3-5-8-9
Consult Murphy for Cylinder and Cycle combinations not listed on this table
201 2-5-6-9
151 1-2-3-5-8-9
SETTING OVERSPEED SET POINTS: DT9805 AND DT9806
X 1000
0
X 100
0
X 10
0
The overspeed set point switches are available on the DT9805 and
DT9806 only. The overspeed set point can be set within ± 5 RPM, over a
range of 0010 to 9990 RPM. Setting of the overspeed set points is made by
properly adjusting of three rotary switches. Each switch can be adjusted in
increments of ten. To set the switches perform the following:
5
5
5
1. Locate the three rotary switches on the back of the unit (Figure 8).
Figure 8:
2. Insert a small blade screwdriver inside the arrow slot. Turn the
screwdriver until the arrow pointer is facing the number you choose.
EXAMPLE: You want the overspeed to trip at 1850 RPM (Figure 8):
(1) Rotate the X-1000-arrow to the (1),
Overspeed switch
set at 1850 RPM
0
0
0
5
5
5
(2) Rotate the X-100-arrow to the (8),
(3) Rotate the X-10-arrow to the five (5).
DT9804 AND DT9806 TROUBLESHOOTING
If the DT9804 or DT9806 tachometer reading is incorrect or erratic follow
the steps below in order until the devices read properly.
1. Check for proper voltage for your ignition system (90-150).
7. The common ground for the capacitor discharge ignition system coils
must be grounded to the engine block, preferably as close to each coil
as possible.
2. Check all grounds, be sure they are good and tight.
8. If the Murphy adaptor package is used make sure the tach is connected
to the input (ALT 1, ALT 2) not the output.
3. Separate ignition wires from primary coil wires.
4. Check switches for correct settings according to the number of engine
cylinders. Where the ignition system has two storage capacitors, the
tachometer must be set for half the number of engine cylinders.
9. Calibration Check: Hook 110 VAC 60 Hz hot to the input 90-150 and
the neutral to the negative input. These readings are ±1 RPM.
Dip Switches On
2, 4, 5
Reading
60
DO NOT USE A PENCIL TO PUSH SWITCHES
.
5. Check reading on 110 VAC 60 Hz with all switches open or on 0. The
1, 5, 9
639
display should read all 0's. Also refer to the calibration chart in step 9.
3, 6, 10
2, 8, 11
1, 7, 12
1284
2704
4951
6. The shutdown lead must be separated at least 12 in. (305 mm) from the
high-tension spark plug leads. The best practice is to run the shutdown
lead from the junction box to the panel in a separate conduit.
Warranty
A two-year limited warranty on materials and workmanship is given with this
Murphy product. Details are available on request and are packed with each unit.
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.
■ Murphy de México, S.A. de C.V.
■ Frank W. Murphy, Ltd.
®
FRANK W.
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]
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
tel. +44 1722 410055 fax +44 1722 410088 tlx 477088
e-mail [email protected]
MFR.
Since 1939
■ 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 Pte., Ltd.
■ Murphy Switch of California
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
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
■ 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]
Printed in U.S.A.
056499
4
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