Murphy Series A900 User Manual

SERIES A900MURPHYMATIC®GENERATORENGINE CONTROL SYSTEMDESIGN, INSTALLATIONAND OPERATING MANUALA900-9025NRevised 10-99Section 40(00-02-0197)DISCONTINUED

7to 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 contactclosure to oper

8setting until the overspeed trips. When switch isreleased, the set point will be 10% above normalrunning speed. This is the method used to make the

9(c) TEST; turns on the engine controls and shutdown circuits.A start signal is applied to the automatic control and theengine start sequence begins.

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

3-6.1.2 Lamp Test Pushbutton: Tests the lights on the A903module.3-6.1.3 Alarm Silence Pushbutton: Turns off any audible alarmthat is connected to

(h) #8 Spare Alarm; operated by an external switch. Thiscircuit is provided for an additional alarm that may berequired by the user.(i) #9 Spare A

audible alarm will turn off when the alarm contact clears.3-7.1.4 The A903-2 SELECTRONIC®Control Module includesthe following engine control features

make up the generator engine control. Relays are available foroperation on either 12 or 24 volt battery systems. Four (4)relays are included for:3-7

5-1/2 in.(140 mm)3-3/4 in.(95 mm)3/16 in.(5 mm) dia.4 places5-5/8 in.(143 mm)2-13/16 in.(71 mm)3 in.(76 mm)3-3/8 in.(86 mm)6-3/4 in.(171 mm)9-3/8 in.(

1526427284293031323334474849505152B+ OUTHOURMETERB- MANUAL STARTSTARTPICKUPPICKUPOIL PRESSURELO WATER TEMP.HI WATER TEMP.REMOTE S.D.SPARE ALARM3536373

WARNINGBEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT✔ Disconnect all electricalpower to the machine.✔ Make sure the machine cannot operate duri

Figure 4-2.3.2: A902 wiring1526427284293031323334B+ OUTHOURMETERB- MANUAL STARTSTARTPICKUPPICKUPOIL PRESSURELO WATER TEMP.HI WATER TEMP.REMOTE S.D.SPA

Figure 4-2.3.3: A903 wiring1526427284293031323334474849505152B+ OUTHOURMETERB- MANUAL STARTSTARTPICKUPPICKUPOIL PRESSURELO WATER TEMP.HI WATER TEMP.RE

current rating that is equal to or greater than the forward currentthat the coil draws to operate. For example, a relay less than 1 A,use a 1 A diode

6. While engine is cranking, turn crank disconnectadjustment counter clockwise slowly until “CrankDisconnect Speed” light turns on and cranking stops.

(c) “Water Temperature” light will come on and engine willstop.(d) Turn Mode Selector switch OFF.4-4.9 Low Water Temperature; to test the low water t

Table 7-2.122ModeSelectorOFFMode SelectorAUTOStand-byMode SelectorAUTOCrankingMode SelectorAUTORunningMode SelectorAUTOShutdownInputVoltageInputVoltag

to the table for examples.(c) Voltages less than battery also may vary due to tolerancesof the electronic components in the A900. Minorvariations, 1

local audible (K-4) terminal 20 and 21, remote audible (K-5)terminal 22 and 23 and remote visual (K- 6) terminal 24 and 25close to operate the alarm d

0690040CONTROL SYSTEMS & SERVICES DIVISIONP.O. Box 1819; Rosenberg, Texas 77471; USA(281) 342-0297 fax (281) 341-6006 e-mail [email protected]

Table of ContentsSection 1: Introduction page 11-1 System 11-2 Models 11-3 Purpose 11-4 Definitions 11-5 How To Use This Manual 1Section 2: Specificat

Section 1: Introduction1-1 System.1-1.1 The MURPHYMATIC®Generator Engine Control System,Series A900 is designed to meet the requirements of the engin

an automatic-start, two-cycle, engine-driven generator, andinclude the shutdown and alarm points recommended in NFPA-110-1988 “Emergency and Standby G

Table 3-1.73Level 1C.V.SL.A.R.A.R.V.Level 2C.V.SL.A.R.A.R.V.NFPA-110NFPA99C.V.SL.A.R.A.R.V.②CAN/CSAC282-M89C.V. S L.A. R.A. R.V.A901C.V.S L.A. R.A. R.

(d) Overcrank circuit; will stop automatic cranking andindicate overcrank if engine fails to start after 3 attempts.The number of cranks are selecta

energize the battery charging alternator field.3-2.2.2 Shutdown Relay; this relay is operated by the shutdowncircuits of the Control / Display Modul

(f) Overspeed Speed Switch;1. Provides a signal to the overspeed shutdown circuit ifthe engine exceeds the preset speed. The factorysetting is appro