Murphy ATS series Manuale utente
TAH-97029N page 1 of 4
Tachometer and Tachometer/Hourmeter Installation
Instructions for Series: ATS, ATHS, ATA, ATHA
TAH-97029N
Revised 01-04
Section 20
(00-02-0258)
Description
These tachometers are indicators of engine revolutions per minute (RPM). Models
equipped with hourmeter also record elapsed, engine running time.
The alternator driven models are designed to function from pulses generated by an alter-
nator with 4, 8, 12, 14, or 16 poles on the rotor.
For magnetic sensor (pickup) driven models, the pulses can be obtained from the ring
gear of an engine by means of an electromagnetic sensor (pickup). Magnetic sensor
driven models are designed for flywheels having anywhere from 70 to 225 teeth.
All units are for negative ground, positive ground or isolated electrical systems. If the
instrument is connected reverse polarity, it will not operate until proper connections are
made. All units are powered by 12 VDC. For 24 VDC applications, a ATVC12/24 con-
verter must be used (see Fig. 3 or Fig. 5).
Specifications
Power Input: 12 VDC (11.5 – 16 V) [0.84 to 1.44W].
Backlight: 3 to 4.7W
RPM Input Signal Voltage: 1.5 Vrms minimum from a magnetic pickup or
alternator (minimum 3-pole).
Accuracy: Tachometer: ±2%full scale. Hourmeter: ±0.01% hours, ±1 count.
Temperature Range: -5°F to 185°F (-20°C to +85°C).
Dial (Face Plate): 270° sweep with white numerals (over black background)
Bezel: 304 Stainless Steel.
Scale: 0-3000 RPM and 0-4000 RPM (ATHA-40-12-A model only)
Case Material: Plastic.
Hourmeter Range: Measures elapsed time: 100,000 hours in 0.1 increments.
Basic Models
Magnetic Sensor (Pickup) Signal Tachometer 70 - 225 pulses 12 VDC
2733Hz to 13.62 kHz@3000 RPM
ATS-30-12 Tachometer w/ Bright Stainless Steel Bezel
ATS-30-12-A Tachometer w/ Black Stainless Steel Bezel
ATS-30-12-B Tachometer w/ SAE Bright Stainless Steel Bezel
ATS-30-12-C Tachometer w/ SAE Black Stainless Steel Bezel
ATHS-30-12 Tachometer/Hourmeter w/ Bright Stainless Steel Bezel
ATHS-30-12-A Tachometer/Hourmeter w/ Black Stainless Steel Bezel
ATHS-30-12-B Tachometer/Hourmeter w/ SAE Bright Stainless Steel Bezel
ATHS-30-12-C Tachometer/Hourmeter w/ SAE Black Bezel
Alternator Signal Tachometer 3 - 27 pulses 12 VDC
137Hz to 1330 Hz@3000 RPM
ATA-30-12 Tachometer w/ Bright Stainless Steel Bezel
ATA-30-12-A Tachometer w/ Black Stainless Steel Bezel
ATA-30-12-B Tachometer w/ SAE Bright Stainless Steel Bezel
ATA-30-12-C Tachometer w/ SAE Black Stainless Steel Bezel
ATHA-30-12 Tachometer/Hourmeter w/ Bright Stainless Steel Bezel
ATHA-30-12-A Tachometer/Hourmeter w/ Black Stainless Steel Bezel
ATHA-30-12-B Tachometer/Hourmeter w/ SAE Bright Stainless Steel Bezel
ATHA-30-12-C Tachometer/Hourmeter w/ SAE Black Stainless Steel Bezel
ATHA-40-12-A Tachometer/Hourmeter w/ Black Stainless Steel Bezel
193Hz to 1815 Hz@4000 RPM
ATVC12/24 24 VDC to 12 VDC Converter
00-00-4617 12 VDC Light Bulb
00-00-4618 24 VDC Light Bulb
GENERAL INFORMATION
Please read the following instructions before installing. A visual inspection is recommended before mounting.
General Information and these installation instructions are intended for all Tachometer and Tachometer/Hourmeter models.
Mount these units in a place where they will be protected from rain and splashing
water. A minimum distance of 12 in. (305 mm) from any coil, coil leads, or high volt-
age wiring should be maintained. These units are intended for mounting in a flat
panel. Cut a 3-3/8 in. (86 mm) diameter hole as shown below. Remove the mounting
bracket from the back of the unit. Insert the instrument from the front side of the
panel and replace the mounting bracket to secure the instrument in place.
Case Mounting Instructions
3-53/64 in.
(97 mm) 3-5/8 in.
(92 mm)
21/32 in.
(17 mm)
3-3/8 in. min.
(86 mm)
Mounting Hole
RPM
x 100
HOURS 1
10
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.
Front View
Side
View
Mounting Bracket Mounting Hole
FWMurphy offers a selection of Magnetic
Sensors (pickups). For installation instruc-
tions see document MP-8802N.
CAUTION:
Disconnect the battery/power source and determine voltage and polarity of the application
before wiring the unit. Use the appropriate wire size. To wire the magnetic sensor pickup use 18 AWG (1.0 mm2)
twisted pair cable. Use insulated crimp-on (solderless) ring-type wire terminals. Allow a few inches of excess
wire to make adjustments.
TAH-97029N page 2 of 4
Connecting or Replacing Light Bulb
1.
Twist the “light assembly” socket one-eighth turn counterclockwise and remove
the “light assembly”. See Fig. 2 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 Magnetic Sensor (see Fig. 2)
The magnetic sensor (pickup) usually has two connections (terminals or wires) exit-
ing from it. These connections are not polarized, either connection can be considered
(+) positive or (-) negative signal. These two connections must be routed directly to
the unit. Do NOT ground one of the connections at the engine.
1.
Connect one of the wires in the twisted pair (from magnetic sensor) to “SIG”.
2.
Connect the other the wire in the twisted pair (from the magnetic sensor) to “GND”.
Connecting to Power (see Fig. 2)
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. 3)
For 24 VDC applications, a ATVC12/24 convertor must be used.
1.
Insert the ATVC12/24 convertor as shown in Fig. 3, at right.
2.
Secure the ATVC12/24 convertor with a nut on the “BAT” and “GND”stud ter-
minals 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.
Mounting Requirements
ATS and ATHS Series Models Typical Wiring
TO LIGHT (+) CIRCUIT
TO GROUND (-)
TO MAG.
PICK UP
LIGHT
ASSEMBLY
CAUTION:
TO 12 VDC ONLY
SIG
GND
BAT
SIG
GND
BAT
TO GROUND (-)
MOUNTING
BRACKET
TO 24 VDC
ATVC12/24
CONVERTER
Fig. 2
Fig. 3
NOTE
'BAT'
S
T
UD
N
UT
L
OC
K WA
S
HE
R
FLAT WA
S
HE
R
N
UT
L
OC
K WA
S
HE
R
FLAT WA
S
HE
R
'GND'
S
T
UD
'
S
IG'
S
T
UD
D
O
N
O
T TIGHTEN THE
SE
N
U
T
S
AGAIN
S
T
C
LAM
P
(
RECOMMENDED TORQUE
:
5 TO 7 INCH POUNDS
)
(
RECOMMENDED TORQUE
:
5 TO 7 INCH POUNDS
)
C
LAM
P
PANEL
WHEN USING ATVC12
/
24
24-Volt convertor car
d
Mak
e
S
ur
e
Nut
s
Ar
e
L
evel Under
C
ar
d
*
2 PLA
C
E
S
O
NL
Y
*
*
CAUTION
Devices containing solid state components can be damaged or caused to
malfunction when used in systems which incorporate inductive loads (e.g.
relays, solenoids, etc.) that can generate reverse voltage spikes.
To reduce the potential for this type of damage, install a properly sized fly-
back or clamping diode across all inductive loads.
Shown at right is a typical example: A typical diode is 1N4005 which is readily available from commercial
sources. Failures of this type are not covered by our Limited Warranty.
Coil
Band
Fig. 1 Fig. 1A
TAH-97029N page 3 of 4
ATA and ATHA Series Models Typical Wiring
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 Alternator (see Fig. 4)
1.
Connect a wire from “SIG” terminal to an AC phase terminal (sometimes
marked “STA” or “R”) on your alternator. If your alternator does not have an AC
phase terminal, solder the “SIG” wire to one of the negative or positive rectifier
diodes of the alternator.
2.
After soldering, securely tape the wire to an alternator lead or wiring harness to
dampen vibration on diode terminal.
NOTE: On some alternators it may be necessary to remove the rear housing to
solder the wire to the diode.
Connecting to Power (see Fig. 4)
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. 5)
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 ter-
minals 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.
ATS and ATHS Series Models Calibration Instructions
Calibration
The ATS and ATHS Series models have been designed to function with flywheels
having anywhere from 70 to 225 teeth. This wide range is divided into 6 switched
positions acting as a “coarse adjustment” as follows:
Switch Position Range of Flywheel Teeth
170 - 80 teeth
281 - 100 teeth
3101 - 130 teeth
4131 - 160 teeth
5161 - 190 teeth
6191 - 225 teeth
1.
If the number of teeth on the flywheel is known, set the calibration “course
adjustment switch”, (see Fig. 6, at right), using a fine blade slotted head screw-
driver to the applicable position per chart above.
2.
If the number of teeth on the flywheel is not known, set up a calibrated “shop
tach” to monitor the engine’s true RPM. Start the engine and after an appropriate
warm-up period increase to normal running RPM as read on the shop tach. If the
course switch was not set in step 1, set it now to the position that causes the
Murphy tach to read closest to true RPM.
*
*
Some engines incorporate a governor that limits full throttle RPM to pre-set
level equal to the engine’s recommended maximum running speed. If your
engine has such a governor, and if the governed full throttle RPM is known (it
should be clearly stated on the engine’s certification documentation), use of a
calibrated shop tach is not necessary. Simply run the engine up to governed
maximum running RPM and calibrate the Murphy tach to the rated RPM as
specified in the engine’s certification documentation.
WARNING:
Make sure that the engine has a properly functioning
and certified governor before attempting this alternate procedure.
Fine Adjustment
The “fine adjustment” of calibration is accomplished by varying the calibration
Trimpot located behind the “fine adjustment” access hole on the rear of the case,
(see Fig. 6, below). Proceed with calibration as follows:
1.
To adjust the trimpot for the exact true RPM, punch through the label and insert
a 5/64 in. (2 mm) hex-end plastic electronic turning tool (or allen wrench)
through the access hole and into the fine adjustment calibration.
2.
Rotate the trimpot clockwise or counterclockwise as necessary.
3.
Once calibration at the engine’s normal running RPM has been set, the tach will
simultaneously be calibrated at all other engine speeds.
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 mm2) 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 SIGNAL
SIG
GND
BAT
CAUTION:
TO 12 VDC ONLY
SIG
GND
BAT
TO GROUND (-)
MOUNTING
BRACKET
TO 24 VDC
ATVC12/24
CONVERTER
Fig. 4
Fig. 5
Fig. 6
BAT
Coarse
Adjustment Switch
Fine Adjustment
Trimpot Access
5
6
4
3
2
1
Tach Back View
(under label)
NOTE
TAH-97029N page 4 of 4
0.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
4
8
12
14
16
PULLEY RATIOS CHART
NO. OF POLES
1.5 —– 13
0.75 —– 6.5
0.5 —– 4.3
0.42 —– 3.7
0.375 —– 3.25
RATIO
Minimum Maximum
ATA and ATHA Series Models Calibration Instructions
ALTERNATOR TACHOMETER CHART
Manufacturer Designation/Type Poles Minimum Maximum
*
pulley-ratio pulley-ratio
*
Although the tach may be calibrated for higher input frequencies in some cases, as shown on the
Pulley Ratio chart, pulley ratios in excess of 5.0 are NOT recommended nor are they normally used.
Prestolite
Load Handler
Load Handler
Leece Neville
Bosch
C.E. Neihoff
Delco Remy
Delco Remy
Delco Remy
Delco Remy
Delco Remy
Hitachi
Hitachi
Lucas
Mando
Motorcraft
Nippondenso
Powerline
Powerline
Valeo
All
88A, 8LHA, 89C, 8LHC
All 5 inch models
All
G and K Series
All
30DN
15SI, 21SI, 40DN, 40SI
10DN, 10SI, 12SI
20DN, 25SI, 27SI
29SI, 30SI
LT125, LT130, LT133
LT150
All
All
All
All
Series 23
Series 24, 25, 26
All
8
16
12
12
12
12
4
12
14
16
16
8
12
12
12
12
12
14
12
12
0.75
0.375
0.5
0.5
0.5
0.5
1.5
0.5
0.42
0.375
0.375
0.75
0.5
0.5
0.5
0.5
0.5
0.42
0.5
0.5
6.5
3.25
4.3
4.3
4.3
4.3
13
4.3
3.7
3.25
3.25
6.5
4.3
4.3
4.3
4.3
4.3
3.7
4.3
4.3
BAT
Coarse
Adjustment Switch
Fine Adjustment
Trimpot Access
5
6
4
3
2
1
Tach Back View
Calibration
The ATA and ATHA Series models will operate from 3 to 27 pulses per engine revo-
lution. Obtain the number of pulses per engine revolution for your alternator system
by working the following formulas:
1.
Determine the number of poles on your alternator. Look for the
designation/type in the manufacturer's manual or remove the pulley and fan to
count the number of poles on the rotor.
2.
The ALTERNATOR TACHOMETER CHART lists common alternators and
their minimum and maximum pulley ratios. Determine pulley ratio with the fol-
lowing formula:
PULLEY RATIO = CRANK SHAFT PULLEY DIAMETER
ALTERNATOR PULLEY DIAMETER
3.
Check that Pulley Ratio falls within the range shown on the PULLEY
RATIOS CHART for a particular alternator. If ratio falls in the shaded area,
the tachometer can be calibrated for the application.
4.
To determine the pulses per engine revolution:
NUMBER OF POLES X PULLEY RATIO = PULSES PER ENGINE REVOLUTION
2
5.
If your answer falls between:
3and 4.5 set “coarse adjustment switch” to #1.
4.55 and 6.0, set the switch to #2.
6.05 and 8.5, set the switch to #3.
8.55 and 12.0, set the switch to #4.
12.05 and 18.0, set the switch to #5.
18.05 and 27.0, set the switch to #6.
Fine Adjustment
The “fine adjustment” of calibration is accomplished by varying the calibration
Trimpot located behind the “fine adjustment” access hole on the rear of the case,
(see Fig.7, below). Proceed with calibration as follows:
1.
To adjust the trimpot for the exact true RPM, punch through the label and insert
a 5/64 in. (2 mm) hex-end plastic electronic turning tool (or allen wrench)
through the access hole and into the fine adjustment calibration.
2.
Rotate the trimpot clockwise or counterclockwise as necessary.
Fig. 7
R
E
G
I
S
T
E
R
E
D
USA–ISO 9001:2000 FM 28221
UK–ISO 9001:2000 FM 29422
Printed in U.S.A.
Wa rranty
A limited warranty on materials and workman-
ship is given with this FWMurphy product.
A copy of the warranty may be viewed or printed
by going to www.fwmurphy.com/warranty.asp.
Call MurCal To Place Your Order
(661) 272-4700 Fax: (661) 947-7570
TM
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