Murphy Portable Generator MGC921 Series User Manual

®
MGC-95093B  
Revised 03-00  
Catalog Section 75  
(00-02-0134)  
FRANK W.  
MFR.  
Generator Panel  
MGC921 Series  
I
Available in Manual or Auto Start  
– 12 or 24 VDC Battery Voltage  
– Single Phase or 3-Phase  
I
I
Compact  
Full Featured  
I Manual Start Panel includes the  
following features.  
Description  
Specifications  
The MGC921 provides economical engine and  
generator control for applications not requiring  
NFPA-99 or NFPA-110 approval. Models are  
available for Manual or Automatic start designed  
for 3-phase, 4-wire or 1-phase, 3-wire genera-  
tors. Models MGC921 feature mechanical  
SWICHGAGE®s for engine oil and coolant tem-  
perature. Models MGC921E feature EGS elec-  
tric SWICHGAGE®s. The panels are housed in a  
13 x 10 x 11 in. (330 x 254 x 279 mm) shock  
mounted NEMA 1 drip-proof enclosure. Current  
transformers (CT’s) are not included.  
I Auto-Start Panel  
Power OFF-ON toggle switch and start  
push button.  
Power Requirements:  
– 12 VDC battery for 12 V models.  
– 24 VDC battery for 24 V models.  
518APH TATTLETALE® annunciator.  
Inputs: Ground or positive inputs for high  
temperature or low pressure sensors.  
Auxiliary starter relay. Contact rating: 12 volt,  
40 amp/24 volt 16 amp.  
Oil Pressure SWICHGAGE®, 2 in (51 mm)  
dial, 0-100 psi (0-689 kPa) [6.89 bar].  
Temperature SWICHGAGE®, 2 in (51 mm)  
dial, 130-250°F (54-121°C), 12 ft. (3.7 m)  
capillary.  
Outputs:  
– Auxiliary starter relay. Contact rating:  
12 volt, 40 amp/24 volt 16 amp.  
– 300 mA transistors for fault annunciation  
Operating Temperature: -4 to 140°F (-20 to  
60°C).  
Two (2) 2-1/16 in. (52 mm) diameter holes,  
plugged.  
Cycle Crank Timer: Up to 8 attempts.  
Recrank on false starts (fixed 30 seconds).  
Features  
I Auto-Start Panel includes the following features.  
I AC meters  
Crank/Rest Cycle Timing: 4 to 25 seconds  
(adjustable).  
ASM150, auto-start controller with:  
– Optically-isolated noise resistant inputs.  
– Outputs for fault annunciator.  
AC voltmeter, 3-1/2 in. (89 mm) dial, ±2%  
full scale (specify range: 300 V or 600 V).  
Shutdown Time Delay: 1 to 25 seconds  
(adjustable). Locks out low oil pressure and  
high temperature on start up.  
AC ammeter, 3-1/2 in. (89 mm) dial, ±2%  
full scale (specify range: 50 to 4000 A).  
– Crank/rest cycle timer, 4 to 25 sec. adjustable.  
– Shutdown time delay, 1 to 25 seconds  
(adjustable), locks out low oil pressure  
and high temperature on start-up.  
– Crank disconnect and overspeed  
sensing operates from a magnetic pickup  
signal (requires 2 Vrms minimum).  
AC frequency meter, 120 V, 3-1/2 in. (89  
mm) dial, ±0.6% Hz, 45–65 Hz.  
Crank Disconnect Speed Setting:  
From 30 to 8500 Hz.  
Frequency meter rheostat.  
Overspeed Trip Point Setting:  
From 30 to 8500 Hz.  
Options  
Magnetic Pickup Input:  
I AC ammeter-voltmeter phase selector switch*.  
Auxiliary starter relay. Contact rating: 12 volt,  
40 amp/24 volt 16 amp.  
Oil pressure SWICHGAGE®, 2-1/16 in. (52  
mm) dial, 0-100 psi (0-689 kPa) [6.89 bar].  
Temperature SWICHGAGE®, 2-1/16 in (52  
mm) dial, 130-250°F (54-121°C), 12 ft.  
(3.7 m) capillary.  
Requires 2 Vrms minimum.  
Requires 2 additional CTs.  
I Manual Start Panel  
I Hourmeter, 2 in. (51 mm) dial, 5-digit.  
Power Requirements:  
I Battery voltmeter, 2 in (51 mm) dial (range  
determined by battery voltage).  
– 12 VDC battery for 12 V models.  
– 24 VDC battery for 24 V models.  
I Battery ammeter, 2 in (51 mm), 60-0-60.  
Operating Temperature: -4 to 140°F  
(-20 to 60°C).  
TEST-OFF-AUTO selector switch.  
*Standard (included) with 3-phase models.  
Two 2-1/16 in. (52 mm) dia. holes, plugged.  
 

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