TAH-97029N (0258) page 5 of 5
Warranty
A limited warranty on materials and workmanship is given with this
FW Murphy product. A copy of the warranty may be viewed or printed
by going to www.fwmurphy.com/support/warranty.htm
ATHI Models Typical Wiring and Calibration Instructions
Connecting or Replacing Light Bulb
1.
Twist the “light assembly” socket one-eight turn counterclockwise and remove the “light
assembly”. See Fig. 4 at right.
2.
To replace the bulb, pull the bulb from the socket and replace with an 00-00-4617 (for
12V), 00-00-4618 (for 24V) bulb or equivalent size as marked on the bulb.
3.
Connect the lamp blade connector to (+) positive side of instrument lighting circuit.
Connecting to Ignition
(
see Fig. 8)
1.
Connect a wire from “SIG” terminal to the negative (-) side of the igniton coil or to the
terminal marked “TACH” on solid-state ignition systems.
Connecting to Power
(
see Fig. 8)
Important:
These units are for 12 VDC only.
1.
Connect a wire from “BAT” to a 12 VDC circuit activated by the ignition switch.
2.
Connect a wire from “GND” to negative voltage source (electrical ground).
Connecting ATVC12/24 Convertor
(
see Fig. 9)
For 24 VDC applications, a ATVC12/24 convertor must be used.
1.
Insert the ATVC12/24 convertor as shown.
2.
Secure the ATVC12/24 convertor with a nut on the “BAT” and “GND”stud terminals of
the Tachometer.
3.
Notice that the stud terminal on the ATVC12/24 convertor becomes the “BAT” stud for
connecting to 24 VDC. Proceed with the connection as shown.
4.
Replace the 12 V bulb with the 24 V bulb supplied with the converter assembly.
CAUTION:
Disconnect the battery/power source and determine voltage and polarity of the application before wiring
the unit. Use the appropriate wire size. It is recommended using 16 AWG (1.5 mm
2
) or larger stranded, insulated wire and
insulated crimp-on (solderless) ring-type wire terminals. Allow a few inches of excess wire to make adjustments.
TO LIGHT (+) CIRCUIT
LIGHT
ASSEMBLY
TO GROUND (-)
TO ALTERNATOR
SIG
GND
BAT
CAUTION:
TO 12 VDC ONLY
SIG
GND
BAT
TO GROUND (-)
MOUNTING
BRACKET
TO 24 VDC
ATVC12/24
CONVERTER
F
Fiig
g.. 8
8
F
Fiig
g.. 9
9
N
NO
OT
TE
E
To Ignition signal
BAT
Coarse
Adjustment Switch
Fine Adjustment
Trimpot Access
5
6
4
3
2
1
Tach Back View
F
Fiig
g.. 1
10
0
Calibration for ATHI models
The ATHI Series models have been designed to function from the ignition
signal on 4, 6 or 8 cylinder engines. Set the “coarse adjustment switch” per
the following table:
Engine
Switch Position
4 cyl.
1
6 cyl.
2
8 cyl.
3
No fine adjustment is necessary.
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.
CONTROL SYSTEMS & SERVICES DIVISION
P.O. Box 1819
Rosenberg, Texas 77471 USA
Phone: +1 281 633 4500 Fax: +1 281 633 4588
E-mail: [email protected]
FRANK W. MURPHY, LTD
Church Rd Laverstock
Salisbury SP1 1QZ UK
Phone: +44 172 241 0055 Fax: +44 172 241 0088
E-mail: [email protected]
Web site: www.fwmurphy.co.uk
COMPUTRONIC CONTROLS, LTD
41 - 43 Railway Terrace Nechells
Birmingham B7 5NG UK
Phone: +44 121 327 8500 Fax: +44 121 327 8501
E-mail: [email protected]
Web site: www.computroniccontrols.com
FW MURPHY INSTRUMENTS (HANGZHOU) CO. LTD
77 23rd Street
Hangzhou Economic & Technological Development Area
Hangzhou, Zhejiang 310018 China
Phone: +86 571 8788 6060 Fax: +86 571 8684 8878
FW MURPHY
P.O. Box 470248
Tulsa, Oklahoma 74147 USA
+1 918 317 4100 Fax: +1 918 317 4266
E-mail: [email protected]
INDUSTRIAL PANEL DIVISION
Fax: +1 918 317 4124
E-mail: [email protected]
MURPHY POWER IGNITION
Web site: www.murphy-pi.com
w w w.
fwmurphy
. c o m
Printed in U.S.A.
