SECTION 4.2
OPERATIONAL ANALYSIS
PART 4
DC CONTROL
INTRODUCTION
This "Operational Analysis" is intended to familiarize
the service technician with the operation of the DC
control system on prepackaged units with air-cooled
engine. A thorough understanding of how the system
works is essential to sound and logical
troubleshooting. The DC control system illustrations
on the following pages include a "V-Type"
prepackaged transfer switch.
UTILITY SOURCE VOLTAGE AVAILABLE
See Figure 1, above. The circuit condition with the
Auto-Off-Manual switch set to AUTO and with "Utility"
source power available can be briefly described as
follows:
• "Utility" source voltage is available to transfer switch
terminal lugs N1/N2. With the transfer switch main
contacts at their "Utility" side, this source voltage is
available to terminal lugs T1/T2 and to the "Load"
circuits.
DUAL SEC.
ALT. EXCITATIO
E 7.
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