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Murphy MURPHYMATIC A900 Series Installation And Operating Manual

Murphymatic generator engine control system
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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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Summary of Contents for Murphy MURPHYMATIC A900 Series

  • Page 1 A900-9025N Revised 10-99 Section 40 (00-02-0197) SERIES A900 MURPHYMATIC ® GENERATOR ENGINE CONTROL SYSTEM DESIGN, INSTALLATION AND OPERATING MANUAL...
  • Page 2 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.

  • Page 3: Table Of Contents

    7-1 Tools Required 7-2 A900 SELECTRONIC 7-3 A900 SELECTRONIC Section 8: Service Parts 8-1 Table 8-1: Replacement Components of the A900 Series Generator Controls 8-2 Table 8-2: Replacement Components of the A900 Controls for Detroit Diesel ® Control Operation and Shutdown ®...

  • Page 4: Section 1: Introduction

    2-2.1 The engine controls, shutdown circuits, alarm and shut- down indicators are powered from the engine starting battery. The A900 series is available in either 12 or 24 V, negative ground. 2-2.2 The A900 is fused for 3 A maximum current.

  • Page 5: A901

    3-1.7 Table 3-1.7 illustrates the alarm and shutdown require- ments of NFPA-110, NFPA99 and CAN/CSA-C282-M89 and compares the features of the A900 series controls to those requirements. 3-2 A901. 3-2.1 Control / Display Module. The Control / Display Module, figure 3-2.1, includes the control and test switches, the solid state...
  • Page 6 Table 3-1.7...
  • Page 7 (d) Overcrank circuit; will stop automatic cranking and indicate overcrank if engine fails to start after 3 attempts. The number of cranks are selectable for 1, 2, 3, 4 or 5 cycles before shutdown. The overcrank circuit may also be turned off so no overcrank shutdown occurs. (e) Shutdown Time Delay Bypass;...

  • Page 8: A901-2

    energize the battery charging alternator field. 3-2.2.2 Shutdown Relay; this relay is operated by the shutdown circuits of the Control / Display Module and provides an output that can be used to trip the generator circuit breaker on an emergency shutdown. 3-2.2.3 Local Audible Alarm Relay;...
  • Page 9 (f) Overspeed Speed Switch; 1. Provides a signal to the overspeed shutdown circuit if the engine exceeds the preset speed. The factory setting is approximately 3894 Hz, or 1980 RPM on an engine with 118 teeth on the flywheel ring gear. The adjustment range is 300 Hz to 10,000 Hz.

  • Page 10: A902

    to operate a local audible alarm as required by NFPA- 110, Level 1 and Level 2. 3-3.2.5 Remote Audible Alarm Relay; provides a contact closure to operate a remote audible alarm as required by NFPA- 110, Level 1. 3-3.2.6 Remote Visual Alarm Relay; provides a contact closure to operate a remote visual alarm as required by NFPA- 110, Level 1.

  • Page 11: A902-2

    setting until the overspeed trips. When switch is released, the set point will be 10% above normal 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 load from the generator and signaled the A902 to stop the engine.
  • Page 12 6-1/2 in. (165 mm) Low Water Temperature Loss of Speed Signal Lamp Test AUTO 9-3/4 in. TEST (248 mm) Figure 3-5.1 (c) TEST; turns on the engine controls and shutdown circuits. A start signal is applied to the automatic control and the engine start sequence begins.

  • Page 13: A903

    of cause of alarm. These circuits activate the alarm relay. Alarm circuits are active as long as power is applied to the A902-2. All are active when the engine is running, shutdown or on standby. Two (2) Amber Alarm Indicating Lights are provided.
  • Page 14 3-6.1.2 Lamp Test Pushbutton: Tests the lights on the A903 module. 3-6.1.3 Alarm Silence Pushbutton: Turns off any audible alarm that is connected to the Local or Remote Audible Alarm Relays. The indicating light will remain on as long as the condition exists.

  • Page 15: A903-2

    (h) #8 Spare Alarm; operated by an external switch. This circuit is provided for an additional alarm that may be required by the user. (i) #9 Spare Alarm; operated by an external switch. This circuit is provided for an additional alarm that may be required by the user.
  • Page 16 audible alarm will turn off when the alarm contact clears. 3-7.1.4 The A903-2 SELECTRONIC ® the following engine control features: (a) Cycle crank circuit; will crank the engine for 15 seconds then rest for 15 seconds until the engine starts. The crank/rest time is selectable for either 10, 15, 20, 25 or 30 seconds.

  • Page 17: Section 4: Installation

    (g) Alarm and shutdown sensing switches as required. 4-2.3.1 The complete wiring of a Model A901 control is shown in figure 4-2.3.1. Provision is made in the A900 series to operate remote lights for all of the alarm and shutdown circuits however these circuits do not have to be wired for the A900 to function.
  • Page 18 Figure 4-1.2.5: Mounting Dimensions A900 Series Module Mounting Holes 1/8 in. (3 mm) diameter 9-3/8 in. (238 mm) 4-15/32 in. (114 mm) Relay Module 5-1/2 in. (140 mm) 1-7/8 in. (48 mm) clearance 6 in. (152 mm) 3 in. (76 mm) 2-13/16 in.
  • Page 19 Hourmeter Voltmeter Input Barrier Terminal Blocks Remove jumper from 4 and 27 to use manual start switch Battery NOTE 2 Auxiliary Starter Solenoid Starter NOTE 2 Energize to Stop solenoid NOTE 2 Energize to Run solenoid Alternator Excitor NOTE 2 Alternator Breaker Shunt trip coil NOTE 1...
  • Page 20 Hourmeter Voltmeter Input Barrier Terminal Blocks Remove jumper from 4 and 27 to use manual start switch Battery NOTE 2 Auxiliary Starter Solenoid Starter Circuit Breaker NOTE 2 Energize to Stop solenoid NOTE 2 Energize to Run solenoid Alternator Excitor NOTE 2 Alternator Breaker Shunt trip coil...
  • Page 21 Hourmeter Voltmeter Input Barrier Terminal Blocks Remove jumper from 4 and 27 to use manual start switch NOTE 2 Battery Auxiliary Starter Solenoid Starter NOTE 2 Energize to Stop solenoid NOTE 2 Energize to Run solenoid Alternator Excitor NOTE 2 Alternator Breaker Shunt trip coil NOTE 1...

  • Page 22: Crank Disconnect

    4-4.1.1 Be sure to have a fully charged battery to do these tests. Low battery voltage can cause improper results during the tests. 4-4.1.2 The “Air Damper Closed” alarm on A900 series for 2 cycle engines can be actuated by either an internal circuit that senses the output to the overspeed relay, from the “Overspeed”...
  • Page 23 Figure 4-4.1.3 Fuel Relay Torque Scews to 12 In./lb. Crank Relay Crank/Rest Number Time of Cranks SW1 = 10 s. SW2 = 15 s. 1 2 3 4 5 1 2 3 4 5 6 7 SW3 = 20 s. SW4 = 25 s.

  • Page 24: Section 5: Operation

    7-1 Tools Required. 7-1.1 Some of the tools necessary for troubleshooting are built into the A900 Series controls. 7-1.1.1 By observing the lights on the front and rear of the control panel, clues to a problem and the possible source can be seen.
  • Page 25 Table 7-2.1...

  • Page 26: A900 Selectronic Control Alarm Circuit Operation

    to the table for examples. (c) Voltages less than battery also may vary due to tolerances of the electronic components in the A900. Minor variations, 1 or 2 volts, normally will have no effect on the A900 operation. (d) The AC voltage at terminal 29 must be a minimum of 2 VAC to drive the speed sensing circuits of the A900.

  • Page 27: Section 8: Service Parts

    40-02-0145 A902-2-12 40-02-0135 A902-2-24 40-02-0148 A903-12 40-02-0151 A903-24 40-02-0152 A903-2-12 40-02-0155 A903-2-24 40-02-0156 Table 8-2: Replacement Components for A900 Series Controls for Detroit Diesel Corporation Model Number Part Number A901-12-DDC 40-35-0020 A901-2-24-DDC 40-35-0029 A902-12-DDC 40-35-0022 A902-2-24-DDC 40-35-0037 A903-12-DDC 40-35-0024 A903-2-24-DDC 40-35-0043 Module, a Relay Module and a number of Relays.
  • Page 28 P.O. Box 1819; Rosenberg, Texas 77471; USA (281) 342-0297 fax (281) 341-6006 FWMurphy e-mail sales@fwmurphy.com P.O. Box 470248 MURPHY DE MEXICO, S.A. DE C.V. Tulsa, Oklahoma 74147 USA Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje (918) 627-3550 San Luis Potosí, S.L.P.; México 78384...

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