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SS-97028N page 4 of 4

SPEED SETTING ADJUSTMENT

For Models SS300 and SS300-LF

NOTE: The adjustment control(s) is a 20-turn potentiometer(s) and
have no stops when the extreme settings are reached. Always turn a
full 20 turns.

1. 

Make sure the 

PICKUP 

LED light is “ON”. The 

PICKUP 

LED will

be flashing for a low frequency (under 30 Hz) and will remain “ON”
for a higher frequency.

2. 

Turn the 

SPEED ADJUST

pot fully clockwise 20 turns (

Figure 13

).

3. 

Run the engine at the desired RPM and adjust the 

SPEED ADJUST

pot

counterclockwise until the 

ENERGIZE 

LED comes “ON” and  the

relay has transferred (

Figure 13

).

For Models SS300-AD and SS300-AD-LF

1. 

Make sure the 

PICKUP 

LED light is “ON”. The 

PICKUP 

LED will be

flashing for low frequency (under 30 Hz) and will remain “ON” for a
high frequency.

2. 

Turn the 

SPEED ADJUST

pot fully clockwise 20 turns (

Figure 14

).

3. 

Turn the 

DE-ENERGIZE

pot fully counterclockwise 20 turns.

4. 

Run the engine at the desired RPM and adjust the 

SPEED ADJUST

pot

counterclockwise until the 

ENERGIZE

LED comes “ON” and  relay

has transferred.

5. 

Reduce the engine speed to the desired drop out point.

6. 

Adjust the 

DE-ENERGIZE

pot clockwise until the 

ENERGIZE

LED

goes “OFF” and the relay has dropped out (

Figure 14

).

ENERGIZE

SPEED

PICKUP

LED

Lights

20 turn 

potentiometers

SPEED

ADJ.

DE-ENERGIZE

Figure 13

Figure 14

CONTROL SYSTEMS & SERVICES DIVISION

P.O. Box 1819; Rosenberg, Texas 77471; USA
+1 281 633 4500  

fax

+1 281 633 4588 

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 
+52 444 8206264  

fax

+52 444 8206336

Villahermosa 52 993 3162117

e-mail

[email protected]

www.murphymex.com.mx

FRANK W. MURPHY, LTD.

Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
+44 1722 410055  

fax

+44 1722 410088  

e-mail

[email protected]

www.fwmurphy.co.uk

MURPHY SWITCH OF CALIFORNIA

41343 12th Street West
Palmdale, California 93551-1442; USA
+1 661 272 4700  

fax

+1 661 947 7570

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 
+61 3 9358 5555  

fax

+61 3 9358 5558

e-mail

[email protected] 

FW Murphy 

P.O. Box 470248
Tulsa, Oklahoma 74147 USA 
+1 918 317 4100 

fax

+1 918 317 4266  

e-mail 

[email protected]  

www.fwmurphy.com

R

E

G ISTERE

D

USA–ISO 9001:2000 FM 28221

UK–ISO 9001:2000 FM 29422

Printed in U.S.A.

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

Summary of Contents for Selectronic SS300 Series

Page 1: ...rm Shutdowns Oil pressure in some engines and transmissions varies widely between running and idle speeds The SS300 Series can select between two pressure switch set points according to speed of the engine or transmission and thus give maximum protection to the equipment while at operating RPM and eliminate nuisance alarms when at idle Adjustable Differential Model The AD can be adjusted to change...

Page 2: ...ach Terminal Ignition Switch SS300 4 INPUT 3 2 1 5 BATT 6 BATT 7 8 SPEED GND FOR T D POS TO LATCH Battery Ignition Switch Coil SS300 4 INPUT 3 2 1 5 BATT 6 BATT 7 8 SPEED GND FOR T D POS TO LATCH Figure 1 Magnetic Pickup Input Figure 2 Alternator Tach Input Figure 3 Distributor Ignition Input Figure 5 Energize to Stop Solenoid CAUTION If replacing an SS100 Series model with an SS300 Series model n...

Page 3: ...00 AD with Clutch Engager The SS300 AD can be applied with a Murphy CO 3 engager Figure 10 The circuit is designed to engage a clutch after engine speed has increased to a preset RPM Example 1200 RPM and disengage clutch when engine speed has decreased to idle Example 600 RPM The adjustable differential SS300 AD relay is set to pull in at 1200 RPM and drop out at 600 RPM Figure 6 Figure 7 Figure 8...

Page 4: ... potentiometers SPEED ADJ DE ENERGIZE Figure 13 Figure 14 CONTROL SYSTEMS SERVICES DIVISION P O Box 1819 Rosenberg Texas 77471 USA 1 281 633 4500 fax 1 281 633 4588 e mail sales fwmurphy com MURPHY DE MEXICO S A DE C V Blvd Antonio Rocha Cordero 300 Fracción del Aguaje San Luis Potosí S L P México 78384 52 444 8206264 fax 52 444 8206336 Villahermosa Office 52 993 3162117 e mail ventas murphymex co...

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