Murphy SHD45, SHD30 User Manual

■

Normally Open and Normally Closed Overspeed
Alarm or Shutdown Switch

(Standard)

■

RPM Data and Power Supplied by Magnetic
Pickup or Capacitor Discharge (CD) Ignition

■

Accurate to ±0.5% of Display Reading

■

Hours Can Be Preset and Reset to Zero

■

Approved for Class I, Division 2,
Groups C & D Hazardous Areas

SHD30 and SHD30-45 Models

Description

The SHD30 and SHD30-45 are microprocessor­based tachometers with hourmeter and an over­speed trip point. The trip point can be connected
as either a form “c ” relay output or as a normally
open SCR output for alarm or shutdown on over­speed.

The SHD30 features a panel-mounting design, plas­tic enclosure that is 5-1/16 (129 mm) long and
4-1/4 in. (108 mm) high.

The SHD30-45 has the same enclosure, but it also
has a backplate with studs to mount like a SHD­45, OPLFC.

The SHD30 models power and RPM data are
supplied by either a magnetic pickup or a capacitor
discharge (CD) ignition. The hourmeter is
adjustable to a preset time and resettable to zero.
Should power be lost, on-board batteries maintain
the run hours display and allow for resetting the
overspeed relay output.

Basic Operation

When a tach signal is present the SHD30 models
display rpm. When a tach signal is not present, the
display is blank unless the Read Hours membrane
key, on the faceplate is pressed and held.

The five-digit, liquid crystal display is updated every
second. The run hours, overspeed set point and
current pulses per engine revolution can be dis­played by manipulating the membrane switches.
Run hours can be displayed even after power is
lost. The run hours display can be configured to
alternate with the RPM display.

Applications

Easy-to-Calibrate

The SHD30 models calibration is done by enter­ing the number of pulses per engine revolution
using the Pulses per Revolution and Overspeed
Setpoint membrane keys, on the faceplate. The
number of pulses is determined by the number of
cylinders, cycles and ignition features. It is also
determined by the number of ring gear teeth of
the engine’s flywheel on a magnetic pickup sys­tem.

Presetting and resetting running hours is done from
the back and front of the SHD30 models.

Specifications

Power input:

CD ignition: 90 to 350 VDC.

150 µA typical @ 90 VDC;
300 µA @ 350 VDC.

Magnetic Pickup: 5 to 120 Vrms.

325 µA typical @ 5 Vrms, 100 Hz;
450 µA typical @ 5 Vrms, 1 kHz;
1 mA typical @ 5 Vrms, 5 kHz;
2 mA typical @ 5 Vrms, 10 kHz;
15 mW max. @ 5 Vrms, 10 kHz;

2.8 W max. @ 120 Vrms, 10 kHz.

Backup Batteries: 2 replaceable, long life

Lithium batteries, Panasonic CR2032 or
equivalent, 3 V, 220 mAh power. Shelf life
expectancy 10 years.

Operating Temperature:

-4° to 158°F (-20° to 70°C).

Storage Temperature:

-40° to 300°F (-40° to 150°C).

Case Material: Plastic.
Ignition Frequency Range: 3 to 666 Hz.
Magnetic Pickup Frequency Range: 1 to 10 kHz.
Overspeed Output:

Connected to S.C.R. (Silicon Controlled

Rectifier) terminals:

0.5 A, 350 VDC continuous.

Connected to Form “C” Relay terminals:

Relay Contact, 0.5 A, 30 VDC, 125 VAC resistive.

Tachometer Accuracy: ±0.5% of the display
reading or ±1 RPM whichever is greater.

Hourmeter Range: 0 to 65535 hrs.
Hourmeter Accuracy: ±15 minutes per year.
Laboratory Approvals: CSA (Canadian

Standards Association) approved for Class I,
Division 2, Groups C & D hazardous areas.

Shipping Weight : 1 lb ( 0.5 kg).
Shipping Dimensions: 9-1/4 x 8-1/4 x 5-1/4 in.

(235 x 210 x 133 mm).

•

Gas Compressors

•

Oil Field Equipment

•

Industrial Engines

•

Generators

When installed per Murphy Drawing 20-08-0258

C US

SHD3-97050B

Revised 07-04

Replaces SHD-95064B

Catalog Section 20

(00-02-0287)

Digital Tachometer and Hourmeter
with Adjustable Overspeed Trip Point

Typical Wiring Diagram

SHD-30 Model Dimensions

Front View Side View

SHD-30-45 Model Dimensions

Mounting Hole

How to Order

Specify model number:

SHD30

= Tach/hourmeter w/overspeed

SHD30-45

= Tach/hourmeter w/overspeed to

mount like SHD45 or OPLFC

00-00-9389

= Panasonic CR2032 or equivalent

backup battery (2 required)

WARNING: In hazardous areas the overspeed relay contact

is certified for use ONLY with Murphy non-incendive or intrin­sically safe products. In non-hazardous areas overspeed relay

contact may be used to switch electromechanical Tattletale

®

or Magnetic
Switches that do not exceed the relay contact rating: 1 A, 30 VDC; 0.3 A,
110 VDC; 0.5 A, 125 VAC. However, the preferred output to switch
electromechanical Tattletale

®

or Magnetic Switches is the N.O. SCR.

Refer to SHD3-97051N for more details.

SHD3-97050B page 2 of 2

A,

Vd

Vd

YP:

A

@

Vd

@

Vd

PU

Va

YP

A

A@

Va

X

AX

@

Va

A

@

Va

A

EL

AY

Vd

Vd

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

CONTROL SYSTEMS & SERVICES DIVISION

P.O. Box 1819; Rosenberg, Texas 77471; USA
[phone] fax [phone]

e-mail [e-mail]

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 [e-mail]
www.murphymex.com.mx

FRANK W. MURPHY, LTD.

Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
[phone] fax [phone]
e-mail [e-mail]
www.fwmurphy.co.uk

MURPHY SWITCH OF CALIFORNIA

41343 12th Street West
Palmdale, California 93551-1442; USA
[phone] fax [phone]
e-mail [e-mail]
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 [e-mail]

FW Murphy

P.O. Box 470248
Tulsa, Oklahoma 74147 USA
[phone]

fax [phone]
e-mail [e-mail]

www.fwmurphy.com

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.

5-1/16 in.
(129 mm)

2 in.

(51 mm)

3-1/8 in.
(79 mm)

diameter

3/16 in
(5 mm)

diameter,

4 places

4-1/4 in.

(108 mm)

2 in.

(51 mm)

2 in.

(51 mm)

1-1/2 in.
(38 mm)

1-9/32 in.

(33 mm)

panel

5-13/16 in.
(148 mm )

TB2

1 NO

TB1

1 MPU +

5-120Vrms

2 MPU –
3 NEG 90-300vdc
4 POS 90-300vdc

C.

N.O.

TB2

1234

TB1

+

5-120Vrms

Shield

ground

Magnetic Pickup

5 - 120Vrms

2 C
3 NC
4 +Overspeed SCR
5 –Overspeed SCR
6

Reset Hourmeter

7

+

–

N.C.

567

1234

–

IGN

+

CD Ignition
90-350VDC

—

OR

5-13/16 in.
(148 mm )

5-1/16 in.
(129 mm)

4-1/4 in.

(108 mm)

Ø6-1/2 in.

c 1kHz;

c

c, 10kHz

5Va

c

300Vd

120Va

@

300Vd

SCR = 0.5A,

c; 600uA @

@ 5Vac,10kHz;

c res

@ 5Vac,100Hz; 450uA@

90Vd
@

c, 125Vd

: 325uA

c,5kHz; 2mA

@ 5Vac,10kHz; 2.8W MAX

150uA

5Va
@

c TYP:

= 0.5A, 30Vd

INSTALLE CONFORMEMENT MURPHY 20-08-0258

MUST BE INSTALLED PER MURPHY DWG. 20-08-0258

1mA

15mw MAX

AY

c-120Vac TYP

5Va

MPU

OUTPUT REL

CD IGN 90-300Vd

1/4 in. (6 mm ) dia. holes

(3 places)

1-5/16 in.
(33 mm )

Side View

KEPS Nuts

(3 Supplied)

1/2 in.

(12 mm )

Ø5-13/64 in.

Front View

Rear View