Generator Panel MGC921 Series Manuals



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


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