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DISCONTINUED
A900-9025N
Revised 10-99
Section 40
(00-02-0197)
SERIES A900
®
MURPHYMATIC GENERATOR
ENGINE CONTROL SYSTEM
DESIGN, INSTALLATION
AND OPERATING MANUAL
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DISCONTINUED Certain danger to human safety and to equipment may occur if some equipment is stopped without pre- warning. It is recommended that monitored functions be limited to alarm-only or to alarm before shutdown. 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 instruction
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DISCONTINUED Table of Contents Section 1: Introduction page 1 1-1 System 1 1-2 Models 1 1-3 Purpose 1 1-4 Definitions 1 1-5 How To Use This Manual 1 Section 2: Specifications 1 2-1 Enclosure Type 1 2-2 Power Requirements 1 2-3 Input Ratings 1 2-4 Output Ratings 1 2-5 Field Wiring Connections 1 2-6 Operating Temperature 1 Section 3: Model Identification 1 3-1 Model Numbers 1 3-2 A901 2 3-3 A901-2 5 3-4 A902 7 3-5 A902-2 8 3-6 A903 10 3-7 A903-2 12 Section 4: Installation 14 4-1 Location 14 4-2 Wi
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DISCONTINUED 1-5 How to use this manual. Section 1: Introduction 1-5.1 Section 1, 2, 4, 5, 6 and 7 contain general information that 1-1 System. ® applies to all A900 models. 1-1.1 The MURPHYMATIC Generator Engine Control System, 1-5.2 Section 3, Model Identification, is broken into seven sub Series A900 is designed to meet the requirements of the engine sections. Section 3-1 allows you to chose the model that best control, shutdown and alarm section of NFPA-110 “Emergency fits your requiremen
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DISCONTINUED an automatic-start, two-cycle, engine-driven generator, and 6-1/2 in. include the shutdown and alarm points recommended in NFPA- (165 mm) 110-1988 “Emergency and Standby Generator Systems” for Level 1 installations. These controllers also meet or exceed the minimum requirements of NFPA-99-1990 “Health Care Low Water Overcrank Facilities” and with the addition of a Low Water Level alarm, Temperature the Canadian standard CAN/CSA-C282-M89 “Emergency Loss of Speed Overspeed Signal Ele
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DISCONTINUED Table 3-1.7 3 CAN/CSA NFPA-110 NFPA99 A901 A902 A903 C282-M89 Level 1 Level 2 C.V. S L.A. R.A. R.V. C.V. S L.A. R.A. R.V. C.V. S L.A. R.A. R.V. C.V. S L.A. R.A. R.V. C.V. S L.A. R.A. R.V. C.V. S L.A. R.A. R.V. C.V. S L.A. R.A. R.V. a. Overcrank X X X X X X X X O O X X X X X X X X X X X X X X X X X X O
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DISCONTINUED (d) Overcrank circuit; will stop automatic cranking and activated by the frequency input, it prevents the engine indicate overcrank if engine fails to start after 3 attempts. from running without overspeed protection. The number of cranks are selectable for 1, 2, 3, 4 or 5 (g) Remote Shutdown; this circuit is provided to shutdown cycles before shutdown. The overcrank circuit may also the engine generator from a remote location. No be turned off so no overcrank shutdown occurs. i
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DISCONTINUED energize the battery charging alternator field. crank/rest time is selectable for either 10, 15, 20, 25 or 30 3-2.2.2 Shutdown Relay; this relay is operated by the shutdown seconds. If the engine false starts, goes above crank circuits of the Control / Display Module and provides an output disconnect speed then drops below that speed, the control that can be used to trip the generator circuit breaker on an will rest for a fixed 10 second period before cranking again. emergency sh
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DISCONTINUED (f) Overspeed Speed Switch; (b) Air Damper Closed; operated by an external switch or by 1. Provides a signal to the overspeed shutdown circuit if the Overspeed Relay circuit. This circuit is provided with the engine exceeds the preset speed. The factory a selector switch to allow the user to determine the source setting is approximately 3894 Hz, or 1980 RPM on an of the signal. engine with 118 teeth on the flywheel ring gear. The (c) Switch Not In Automatic; operated by the OFF-A
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DISCONTINUED to operate a local audible alarm as required by NFPA- 110, on the flywheel ring gear. Level 1 and Level 2. (c) Auxiliary Crank Disconnect Circuit; this circuit, required 3-3.2.5 Remote Audible Alarm Relay; provides a contact by NFPA-110, is provided as a back up for the Crank closure to operate a remote audible alarm as required by NFPA- Disconnect Speed Switch. It is operated by an external 110, Level 1. switch sensing either speed, generator voltage or some 3-3.2.6 Remote Visu
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DISCONTINUED setting until the overspeed trips. When switch is that can be used to trip the generator circuit breaker on an released, the set point will be 10% above normal emergency shutdown. running speed. This is the method used to make the factory setting. With engine speed at 1800 RPM or 3540 Hz. (g) Cooldown circuit; this circuit keeps the engine running for five minutes after the transfer switch has removed the 3A Fuse load from the generator and signaled the A902 to stop 1A the engi
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DISCONTINUED 6-1/2 in. be turned off so no overcrank shutdown occurs. (165 mm) (e) Shutdown Time Delay Bypass; this delay prevents the oil pressure, water temperature and loss of speed signal shutdown circuits from operating for 15 seconds after the engine starts as detected by the crank disconnect circuit. Low Water Overcrank Temperature (f) Overspeed Speed Switch; Loss of Speed Overspeed 1. Provides a signal to the overspeed shutdown circuit if Signal the engine exceeds the preset speed.
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DISCONTINUED of cause of alarm. These circuits activate the alarm relay. reset an external circuit when the Mode Selector is turned Off. Alarm circuits are active as long as power is applied to the 3-5.3.2 The System Ready signal at terminal 13 is on (closed A902-2. All are active when the engine is running, shutdown or to negative) as long as the Mode Selector Switch is in either ® on standby. Two (2) Amber Alarm Indicating Lights are Auto or Test and no shutdown TATTLETALE circuit is provid
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DISCONTINUED 3-6.1.2 Lamp Test Pushbutton: Tests the lights on the A903 the load from the generator and signaled the A903 to module. stop the engine. This feature may be selected (turned 3-6.1.3 Alarm Silence Pushbutton: Turns off any audible alarm On, standard setting is Off) with a switch on the back of that is connected to the Local or Remote Audible Alarm Relays. the Control / Display Module. The indicating light will remain on as long as the condition 3-6.1.5 Seven (7) First-out Shutdown
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DISCONTINUED (h) #8 Spare Alarm; operated by an external switch. This positive) as long as the Mode Selector Switch is in either Auto circuit is provided for an additional alarm that may be or Test. When the Mode Selector is turned Off, the Control On required by the user. signal is open. This can be used to signal switch position or to (i) #9 Spare Alarm; operated by an external switch. This reset an external circuit when the Mode Selector is turned Off. circuit is provided for an addit
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DISCONTINUED audible alarm will turn off when the alarm contact clears. are provided. The Remote Shutdown circuit does not have an ® 3-7.1.4 The A903-2 SELECTRONIC Control Module includes indicator light. the following engine control features: (a) Overcrank; tripped by the overcrank sensing circuit which (a) Cycle crank circuit; will crank the engine for 15 seconds counts the number of cranking attempts. then rest for 15 seconds until the engine starts. The (b) Overspeed; tripped by overs
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DISCONTINUED make up the generator engine control. Relays are available for Section 4: Installation operation on either 12 or 24 volt battery systems. Four (4) 4-1 Location. relays are included for: 4-1.1 The A900 series is designed to mount in a ® MURPHYMATIC Generator Control panel with the Control / Display module on the front panel and the Relay module on the inside bottom surface. Other types of installation is possible as long as the relationship of the two modules are maintained. 3A F
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DISCONTINUED Figure 4-1.2.5: Mounting Dimensions 6 in. (152 mm) 3 in. (76 mm) 2-13/16 in. A900 Series (71 mm) Module 5-5/8 in. (143 mm) 1-1/2 in. (38 mm) clearance Mounting Holes 1/8 in. (3 mm) diameter 6-3/4 in. 9-3/8 in. (171 mm) (238 mm) 3-3/8 in. (86 mm) 4-15/32 in. (114 mm) 5 in. (127 mm) maximum between A-900 Series module & relay module when mounting Relay Module 3/16 in. (5 mm) dia. 4 places 5-1/2 in. (140 mm) 3-3/4 in. (95 mm) 1-7/8 in. (48 mm) 1-7/8 in. (48 mm) clearance clearance 15
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DISCONTINUED Figure 4-2.3.1: A901 wiring Hourmeter Voltmeter B+ Input Output Barrier Barrier Terminal Terminal Blocks AUTO START Blocks MODULE 15 B+ OUT ALARM SILENCE 35 26 HOURMETER AUDIBLE ALARM 36 4 B- OVERCRANK 37 Remove jumper from 4 and 27 to use 27 MANUAL START OVERSPEED 38 manual start switch 28 START OIL PRESSURE 39 4 PICKUP HI WATER TEMP. 40 29 PICKUP REMOTE SHUTDOWN 41 30 OIL PRESSURE SPARE SHUTDOWN 42 31 LO WATER TEMP. LOSS OF SPEED 43 32 HI WATER TEMP. LO WATER TEMP. 44 33 REMOTE S
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DISCONTINUED Figure 4-2.3.2: A902 wiring Hourmeter Voltmeter B+ Input Output Barrier Barrier Terminal Terminal Blocks AUTO START Blocks MODULE 15 B+ OUT ALARM SILENCE 35 26 HOURMETER AUDIBLE ALARM 36 4 B- OVERCRANK 37 Remove jumper from 4 and 27 to use 27 MANUAL START OVERSPEED 38 manual start switch 28 START OIL PRESSURE 39 4 PICKUP HI WATER TEMP. 40 29 PICKUP REMOTE SHUTDOWN 41 30 OIL PRESSURE SPARE SHUTDOWN 42 31 LO WATER TEMP. LOSS OF SPEED 43 32 HI WATER TEMP. LO WATER TEMP. 44 33 REMOTE S
