Murphy Automobile Parts DT9803 User Manual

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  
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.  
tel. +44 1722 410055 fax +44 1722 410088 tlx 477088  
MFR.  
Since 1939  
Frank W. Murphy Manufacturer  
P.O. Box 470248; Tulsa, Oklahoma 74147; USA  
tel. (918) 627-3550 fax (918) 664-6146  
Frank W. Murphy Pte., Ltd.  
Murphy Switch of California  
26 Siglap Drive; Republic of Singapore 456153  
tel. +65 241-3166 fax +65 241-8382  
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  
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  
Printed in U.S.A.  
056499  
4
 

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