Bryant ASPAS1BBA015 User Manual download pdf (Page 52)

Page 52

SECTION 3.2

OPERATIONAL ANALYSIS

PART 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.

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Bryant ASPAS1BBA015 User Manual Page 52