DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: 
CHAPTERPAGE 341
MAINTENANCE MANUAL STEMME S12
3.7.2.3 OVER VOLTAGE PROTECTION
The outputs of the belt driven alternator and of the internal generator are monitored by a dedicated
over-voltage device OVP. The device senses the voltage of the related system and disconnects the
related alternator resp. generator in the case of system voltages of more than 15.2 V.
Each OVP is located in the related distribution box. A yellow light at the box indicates a triggered
over-voltage protection.
3.7.3 DC INDICATION ATA 243700
3.7.3.1 DESCRIPTION
Each electrical system includes a voltmeter to indicate the system voltage and an ammeter to
indicate the current between system and battery. Both instruments can be toggled between
main and engine system by a common toggle switch. The ammeter is supplied by shunts in the
positive lines of the batteries. Positive reading indicates battery charging, negative reading
indicates battery discharging.
A red warning light indicates failure of the main system alternator.
A yellow warning light indicates failure of the engine system generator.
Voltmeter, ammeter, toggle switch and warning lights are located on the right hand part of the
instrument panels and easy to read and to operate by the crew. Switch and warning lights are
clearly labeled.
3.7.4 PARTS SPECIFICATION
Part STEMME p/n Manufacturer p/n
Voltmeter 831.120 UMA N141100917V0A0
Ammeter 831.121 UMA N15110003CA000
Shunt 831.122 UMA 1C1
3.7.5 OPERATION
Use toggle switch to choose indication of engine system voltage and current or main system
voltage and current.
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