Murphy MLA20 User manual

Installation Instructions for MurphyLinkTM
Analog Gages Series: MLA20 and MLA35
MLA-00012N
Revised 10-04
Section 78
00-02-0424
Description
The MurphyLink
TM
gages are a series of instruments designed to display the
information transmitted by the Murphy Display and Diagnostic Module
(MDDM) in a traditional analog format. Communication from the MDDM to
these units is via an RS485 twisted pair proprietary serial link. These
MurphyLink
TM
components are environmentally sealed, LED back lit (green)
and are available in a standard 2 in. (51 mm) diameter, plastic case. The
MLA35 Series models feature a 3-3/8 in. (86 mm) diameter, plastic case.
Specifications
Power Supply:
Input Voltage: 12V (10-16 VDC min. & max. voltage).
24V (18-32 VDC min. & max. voltage).
Operating Current: (@ 14 VDC) = MLA20: 27 mA min.; 50 mA max.
MLA35: 43 mA min.; 48 mA max.
Backlight:
Voltage: 12 to 14 VDC (See NOTE below).
Maximum Current: 30 mA.
Input: RS485 data (MurphyLink
TM
proprietary protocol).
Output: Analog Readout.
Operating Temperature: -40° to 185°F (-40° to 85°C).
Storage Temperature: -76° to 185°F (-60° to 85°C).
Dial: White numerals over black background:
MLA20: 90° sweep; MLA35: 250° sweep.
Gage Accuracy: MLA20: Better than ±1.5% of scale.
MLA35: Better than ±2% of scale.
Enclosure: Environmentally Sealed.
Material:
Case and Clamp: Polyester (PBT).
Lens: Polycarbonate.
Bezel: Stainless Steel (Black optional).
Please read the following information before installing. A visual inspection of this product for damage during ship-
ping is recommended before mounting. It is your responsibility to have a qualified person install this unit.
GENERAL INFORMATION
Basic 2 in. (51 mm) case models
MLA20-A-100-A Engine Oil Pressure
MLA20-B-250-A Coolant Temperature
MLA20-C-12-A Voltmeter 12 VDC
MLA20-C-24-A Voltmeter 24 VDC
MLA20-D-100-A Percent Load @ Current Speed
MLA20-E-400-A Gear Oil Pressure
MLA20-F-250-A Gear Oil Temperature
Basic 3-3/8 in. (86 mm) case models
MLA35-T-3000-A Tachometer
MLA35-S-85-A Speedometer
NOTE: All basic models listed above are available with Amp mini
universal (standard), Deutsch or Metri-Pack connectors.
CAUTION: These instruments are designed to be used ONLY
with the MurphyLink
TM
Display and Diagnostic module (MDDM)
or other approved MurphyLink
TM
products.
NOTE: MLVC2412 Regulator required for 24 VDC Systems.
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.
MLA20 Series MLA35 Series
Warranty
A limited warranty on materials and workmanship is given with this
FWMurphy product. A copy of the warranty may be viewed or printed by
going to www.fwmurphy.com/warranty.asp.
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.
Installation MLA-00012N page 1 of 2

MLA20 and MLA35 Dimensions and Mounting
For Panels up to 3/4 in. (19 mm)
maximum thickness
For Panels up to 3/8 in.
(9.5 mm) maximum thickness
Mounting Clamp
Mounting Hole
2.062 in. (52 mm) Dia.
2.25 in. (57 mm) 1.94 in. (49 mm)
0.48 in. (12 mm) Push On Plug (Amp)
Connection
1.94 in.
(49 mm)
Mounting Clamp
Mounting Hole
3.375 in. (86 mm) Dia.
3.55 in. (90 mm) 2.0 in. (51 mm)
0.48 in. (12 mm)
3.22 in.
(82 mm)
Push On Plug (Amp)
Connection
For Panels up to 3/4 in. (19 mm)
maximum thickness
For Panels up to 3/8 in.
(9.5 mm) maximum thickness
MLA20 Series MLA35 Series
Orange
Battery
Ignition
Switch
Red
120 Ω
Place Resistor at
End of Line on
Last MLA gage.
(included for factory
purchased panels.)
To Next
MLA Gage
Back
Light
Ground
Battery
Blue
White RS485 (+) Data
RS485 (-) Data
MDDM Gage
Rear View
Illumination
Control*
(optional)
*Electronic Dimmer switch recommended with 4 A, capacity
or heavy duty rheostat switch, 25 ohm, 5 watt.
For more than 6 MLA gages, contact factory for rheostat sizing.
MLA Gage
Rear View
Pin A Pin H
Black
Orange
Battery
Ignition Switch
Red
120 Ω
To Next
MLA Gage
Back
Light
Ground
A (V in) B (Ground) C (V Out)
Battery
Blue
White RS485 (+) Data
RS485 (-) Data
MDDM Gage
Rear View
Illumination
Control*
(optional)
Back Light
Voltage
Regulator
(MLVC2412)
*Electronic Dimmer switch recommended with 4 A, capacity
or heavy duty rheostat switch, 25 ohm, 5 watt.
For more than 6 MLA gages, contact factory for rheostat sizing.
MLA Gage
Rear View
Pin A Pin H
Black
Place Resistor at
End of Line on
Last MLA gage.
(included for factory
purchased panels.)
Wiring for 12 VDC Systems Wiring for 24 VDC Systems
WARNING: Disconnect battery negative cable before wiring or service. 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 voltage spikes. To reduce the
potential for this type of damage, install a fly back or clamping diode across all inductive loads. Use Murphy diode package 65-00-0343 or equivalent.
A typical diode is 1N4005 and is readily available from commercial sources. Failures of this type are not covered by our Limited Warranty.
MLA20 and MLA35 Typical Wirings For 12 and 24 VDC
Installation MLA-00012N page 2 of 2
CONTROL SYSTEMS & SERVICES DIVISION
P.O. Box 1819; Rosenberg, Texas 77471; USA
[phone] fax [phone]
e-mail [email protected]
MURPHY DE MEXICO, S.A. DE C.V.
Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
[phone] fax [phone]
Villahermosa Office [phone]
e-mail [email protected]
www.murphymex.com.mx
FRANK W. MURPHY, LTD.
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
[phone] fax [phone]
e-mail [email protected]
www.fwmurphy.co.uk
MURPHY SWITCH OF CALIFORNIA
41343 12th Street West
Palmdale, California 93551-1442; USA
[phone] fax [phone]
e-mail [email protected]
www.murphyswitch.com
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.
MACQUARRIE CORPORATION
1620 Hume Highway
Campbellfield, Vic 3061; Australia
[phone] fax [phone]
e-mail [email protected]
FW Murphy
P.O. Box 470248
Tulsa, Oklahoma 74147 USA
[phone]
fax [phone]
e-mail [email protected]
www.fwmurphy.com
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USA–ISO 9001:2000 FM 28221
UK–ISO 9001:2000 FM 29422
Printed in U.S.A.