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SECTION 3.2
OPERATIONAL ANALYSIS
PART 3
Page 3.2-3
V-TYPE PREPACKAGED
TRANSFER SWITCHES
UTILITY
SOURCE
VOLTAGE
FAILURE
If utility source voltage should drop below a preset value, the generator circuit board will sense the dropout. That
circuit board will then initiate generator cranking and startup after a time delay circuit times out.
Figure 3 is a schematic representation of the transfer switch with generator power available, waiting to transfer.
❏Generator voltage available E1, E2.
❏Circuit board action holding Wire 23 open to ground.
❏Power available to standby coil C2, upon closure of TR, normally open contacts (9 & 6) will close and initiate a
transfer.
Figure 3. Generator Power Available, Waiting to Transfer.