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Guardian Technologies 4758 User Manual

Page 50

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SECTION 3.1

DESCRIPTION & COMPONENTS

Figure 6. Transfer Switch Terminal Block

Terminals used on the terminal block are identified as
Utility 1 and 2; 23 and 194.

UTILITY 1 AND 2:

Interconnect with identically labeled terminals in the
generator control panel assembly. This is the utility
voltage signal to the circuit board. The signal is
delivered to a step-down transformer in the control
module assembly and the resultant reduced voltage is
then delivered to the circuit board. UTILITY 1 and 2
power is used by the circuit board as follows:
❏ If utility source voltage should drop below a preset

level, circuit board action will initiate automatic
cranking and startup, followed by automatic transfer
to the standby source.

❏ Utility source voltage is used to operate a battery

trickle charge circuit which helps to maintain battery
state of charge during non-operating periods.

TERMINALS 23 AND 194:

These terminals connect the transfer relay to the
generator circuit board. See "Transfer Relay" on Page
3.1-2.

FUSE HOLDER

The fuse holder holds two (2) fuses, designated as
fuses F1 and F2. Each fuse is rated 5 amperes.

FUSES F1, F2:

These two fuses protect the terminal board UTILITY 1
and 2 circuit against overload.

Figure 7. The Fuse Holder

V-TYPE PREPACKAGED

TRANSFER SWITCHES

PART 3

Page 3-1.4

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