Introduction, Specifications | Murphy MC-900 Series specs

Section 1: Introduction

1-1 System.

1-1.1The MURPHYMATIC® Manual Generator Engine Control System, Series MC-900 is designed to meet the requirements of the engine control and shutdown for manual start generator engines.

By combining one of the MC-900 series controls with generator instruments, a complete engine generator control panel can be provided.

1-2 Models.

1-2.1The Series MC-900 is available in two basic configurations:

1-2.1.1Model MC-900 for manual start and stop generator sets with four cycle engines which includes the minimum normal shutdowns.

1-2.1.2Model MC-900-2 for manual start and stop generator sets with two cycle engines which includes the minimum normal shutdowns and an “Overspeed Relay” to operate the air shutoff solenoid for overspeed shutdown.

1-2.2Both models are available for 12 or 24 volt operation.

1-2.3Both models include four unlabeled shutdown circuits for additional customer specified shutdowns.

1-2.4Each model is made up of two parts, a Control/Display module and a Relay module.

1-3 Purpose.

1-3.1This manual is directed to the installation, maintenance and operating personnel who will be in day to day contact with the MC-900 system.

1-3.2No manual can cover all aspects of a product. However the basic knowledge gained with this material will allow those personnel to easily adjust to special circumstances.

1-4 Definitions.

1-4.1Throughout this manual, reference is made to organizations, trade names and trademarks which may not be familiar to the reader. Some of these are:

1-4.1.1NFPA: National Fire Protection Association.

1-4.1.2NFPA-70: The National Electrical Code.

1-4.1.3Several terms used in this manual are registered trademarks of Frank W. Murphy Mfr.

(a)MURPHYMATIC®: Refers to all Murphy automatic controls.

(b)SELECTRONIC®: A name that is applied to all electronic controls manufactured by Murphy.

(c)SWICHGAGE®: A combination indicating gauge and switch.

(d)TATTLETALE®: A term that refers to a shutdown indicating device or circuit in the control panel.

1-5 How to use this manual.

1-5.1Section 1, 2, 4, 5, 6 and 7 contain general information that applies to all MC-900 models.

1-5.2Section 3, Model Identification, is broken into three sub sections. Section 3-1 allows you to chose the model that best fits your requirements and Section 3-2 and 3-3 explain each models features in detail.

Section 2: Specifications

2-1 Enclosure Type.

2-1.1The MC-900 Series enclosure is designed to be mounted in a standard electrical enclosure for indoor use.

2-1.2The MC-900 Series shares the same enclosure as the A- 900 automatic start controller so they can be used interchangeably in a generator control panel.

2-2 Power Requirements.

2-2.1The engine controls, shutdown circuits and shut-down indicators are powered from the engine starting battery. The MC-900 series is available in either 12 or 24 volt, negative ground.

2-2.2The MC-900 is fused for 3 amp. maximum current.

2-3 Input Ratings.

2-3.1All input switches should be dry contact type, maximum current is 2 ma, 8 VDC or less.

2-3.2Frequency signal for the speed sensing circuit requires a minimum input of 2 volts RMS from a magnetic pickup (preferred) or from the tachometer terminal of the battery charging alternator.

2-3.2.1Frequency range of the speed sensing circuit is 300 Hz to 10,000 Hz.

2-4 Output Ratings.

2-4.1The MC-900 Control / Display Module has outputs for remote indication of shutdowns. These outputs are transistors that close to the negative supply (sink) and are rated at 1 amp, 30 VDC maximum.

2-4.2The Control / Display Module also has an output for an auxiliary starter contactor which is rated 1 amp, 30 VDC maximum. This is a transistor that closes to the positive supply (source).

2-4.3The Relay Module includes 3 engine control relays with contact ratings of 7 amp, 30 VDC inductive. These powered contacts must be suppied from an 8 amp. fuse or circuit breaker (customer supplied).

2-5 Field Wiring Connections.

2-5.1All field wiring connections are barrier terminal blocks, UL rated for 15 amp, 300 volt.

2-6 Operating Temperature.

2-6.1The operating temperature range of the MC-900 is -4°F to 158°F / -20°C to 70°C.

Section 3: Model Identification

3-1 Model Numbers.

3-1.1MC-900-12 and MC-900-24: These models are designed for a manual start four cycle engine driven generator, and include the minimum shutdown points normally supplied on such installations. The suffix numbers -12 and -24 indicate the engine starting battery voltage.

3-1.2MC-900-2-12 and MC-900-2-24: These models are designed for a manual start two cycle engine driven generator, and include the minimum shutdown points normally supplied on such installations. The suffix numbers -12 and -24 indicate the engine starting battery voltage.

3-1.2.1The MC-900-2 series control includes an “Overspeed Relay” to trip the air shut-off solenoid on overspeed of a two cycle engine.

MC-900 Series specifications

The Murphy MC-900 Series stands out as a premier solution in the realm of engine monitoring and control technology. Designed for reliable performance in various demanding applications, the MC-900 Series is tailored for both diesel and gas engines, making it a versatile choice for industries ranging from marine to construction and beyond.

One of the primary features of the MC-900 Series is its comprehensive monitoring capabilities. The device is equipped with advanced sensors that provide real-time data on crucial engine parameters such as temperature, pressure, speed, and more. With its easy-to-read LCD display, operators can quickly access this information, facilitating proactive management of engine performance and health.

The MC-900 Series utilizes cutting-edge technology, including microcontroller-based processing, which enhances its operational reliability and accuracy. This technology allows the MC-900 to execute complex algorithms that monitor engine performance, ensuring optimal operation while minimizing risks of failure. Additionally, the system supports multiple input types, enabling seamless integration with a wide range of sensor configurations.

Durability is a standout characteristic of the Murphy MC-900 Series. Designed to withstand harsh environments, the unit boasts a robust construction with water-resistant housing. This resilience ensures that it can perform effectively in extreme temperatures, vibrations, and other challenging conditions often encountered in industrial settings.

Another critical aspect of the MC-900 Series is its customizable alarming system. Users can set thresholds for various parameters, triggering alarms when values exceed predefined limits. This feature allows for timely intervention, reducing the likelihood of engine damage and downtime.

Moreover, the MC-900 Series offers ample connectivity options, including analog and digital outputs. This flexibility supports integration with other control systems and devices, making it an excellent choice for modern applications requiring comprehensive data connectivity.

In summary, the Murphy MC-900 Series is an advanced engine monitoring solution known for its reliability, durability, and sophistication. With state-of-the-art technologies, customizable features, and robust construction, it addresses the needs of various industries and ensures optimal engine operation, longevity, and safety. Whether for monitoring fuel efficiency or safeguarding against potential malfunctions, the MC-900 Series is designed to meet the rigorous demands of engine management in today’s fast-paced environments.