Installation and Operation Instructions for SELECTRONIC® Speed Switches

SS300 Series

SS-97028N

Revised 05-04

Section 20

00-02-0286

Please read the following information before installing. A visual inspection of this product for damage during shipping is rec- ommended before mounting. It is your responsibility to have a qualified person install this unit and make sure it conforms to NEC and local codes.

GENERAL INFORMATION

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.

SS300-AD

 

 

SPEED SWITCH

 

 

1

 

 

 

 

 

2

PICKUP

 

 

3

 

 

 

 

 

4 INPUT

ENERGIZE

 

 

 

 

 

 

 

5 -BATT

SPEED

 

 

 

 

 

 

6 +BATT

 

 

 

 

 

ADJ.

 

 

 

 

7 GND. FOR

 

 

 

 

 

T/D

 

 

 

 

 

8 POS. TO

DE-ENERGIZE

 

 

 

 

LATCH

 

 

 

 

 

 

 

 

 

Description

The SS300 Series are single set point speed switches with SPDT relay dry contact output. The trip point is set by a potentiometer. An LED indicates when the signal source is present. A second LED turns on when the trip point is reached. See Table 1 for available models and requirements. An optional time delay is on board to delay operation of the relay for 2-6 seconds after the set point has been reached.

The SS300 Series speed switch is intended for installation within a weatherproof enclosure to protect it from rain, dust, etc.

Overspeed Shutdown

The SS300 Series shuts down the engine if RPM exceeds the pre-set limit.

Speed Sensitive Pull-in/Drop-out

Engage or disengage PTO’s, 4-wheel drives, other switch points, etc. according to speed of engine being monitored.

Engine and Transmission Alarm/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 the speed range over which the pull-in and drop-out differential of the relay will operate. A typical application is to insure that engine speed is above a minimum RPM before applying a load but allows a drop in speed of several hundred RPM without disconnecting the load.

Table 1: Models Available and Input Signal

Model Number

Distributor

Magnetic

Alternator

Voltage

 

Ignition

Pickup

 

12

24

SS300 (std. model)

 

 

 

 

 

 

 

 

SS300-LF (low frequency)

 

 

 

 

 

 

 

SS300-AD (adjustable differential)

 

 

 

 

 

 

 

 

SS300-AD-LF (low frq. & Adjst. diff.)

 

 

 

 

 

 

 

Specifications

Power Requirements:

12 VDC (9-16 VDC).

24 VDC (18-30 VDC).

Frequency Signal: Voltage (all models):

Minimum Input Voltage Signal: 4.5 Vrms.

Maximum Input Voltage Signal: 50 Vrms.

Maximum Current

12V

 

 

24V

 

 

 

 

 

 

Pull In

46 mA

 

 

46 mA

 

 

 

 

 

Pickup only

10.5 mA

 

16 mA

 

 

 

 

 

 

 

 

Frequency Range in Hz

 

Model Number

 

 

 

 

25-2000

 

 

SS300-LF

 

 

 

SS300-AD-LF

 

 

 

 

625-9000

 

 

SS300-AD

 

 

 

SS300

 

 

 

 

 

 

 

Reset Differential Magnetic Pickup Signal Models:

“Standard Models: 2 Hz Differential.

“AD” Models (Adjustable Differential): 650-8900 Hz Adjustable

Reset Differential Alternator Models:

“LF” Models (Low Frequency): 2 Hz Differential

“AD-LF” Models (Adjustable Differential Low Frequency): 50-1900 Hz Adjustable.

Output: Relay contact, SPDT, resistive load, 6 A, 30 VDC.

Time Delay: When terminal 7 is grounded, the relay operation is delayed for 2-6 seconds after rpm set point is reached.

Adjustment: 20–turn potentiometer(s).

Temperature Range: -4° to 185°F (-20° to 85°C).

Relative Humidity: 0 to 95% Non-condensing.

Case: Black, ABS plastic.

SS-97028N page 1 of 4

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Murphy SS300 Series specifications Models Available and Input Signal, General Information

SS300 Series specifications

The Murphy SS300 Series represents a significant advancement in the realm of engine monitoring and control solutions. Recognized for its precision and reliability, the SS300 Series is designed primarily for diesel and natural gas engines, making it a staple in various applications, including industrial machinery, marine vessels, and power generation systems.

One of the standout features of the Murphy SS300 Series is its robust monitoring capabilities. The system is equipped with advanced sensors and gauges that allow for real-time data collection on important engine parameters such as oil pressure, coolant temperature, fuel levels, and RPM. This data is crucial for ensuring optimal engine performance and longevity, as it enables operators to identify potential issues before they escalate into costly failures.

The SS300 Series also incorporates state-of-the-art communication technologies. With support for protocols like CANbus, Modbus, and Serial communications, the system can be easily integrated into existing setups, allowing for seamless data exchange between the engine control unit and other important components. This feature not only enhances operational efficiency but also simplifies the overall management of the engine and its auxiliary systems.

Another key characteristic of the SS300 Series is its user-friendly interface. Featuring a high-resolution display, the system presents critical information in an easily digestible format. Users can access menu-driven functions with simple navigation, enabling them to monitor engine performance and make adjustments on-the-fly, even in challenging environments.

Durability is a core design principle of the SS300 Series. Built to withstand harsh conditions, the system is housed in rugged enclosures that offer protection against moisture, vibration, and extreme temperatures. This ensures dependable performance in demanding applications, whether onboard a ship or in a remote power plant.

Additionally, the Murphy SS300 Series offers customizable alarm settings and fault diagnostics. Operators can set thresholds for various parameters and receive immediate alerts if any readings exceed these levels. This proactive approach to engine management not only enhances safety but also minimizes downtime, allowing businesses to maintain productivity.

In conclusion, the Murphy SS300 Series stands out as a leading engine monitoring and control solution through its advanced features, robust communication technologies, user-friendly design, and durability. It offers a comprehensive toolset for operators aiming to optimize engine performance while ensuring safety and reliability across diverse applications.