Generac Power Systems CorePower 6/7 kW 60 Hz Diagnostic Repair Manual page 62

Section 4.1
Description and Components
GENERAL
This section will familiarize the reader with the various components
that make up the DC control system. Major DC control system
components that will be covered include the following:
• A Terminal Strip / Interconnection Terminal
• A Controller
• An AUTO-OFF-MANUAL Switch (CorePower only)
• Touchpad with AUTO, OFF and MANUAL buttons. (PowerPact
only)
• A 7.5 Amp Fuse
TERMINAL STRIP / INTERCONNECTION
TERMINAL (COREPOWER ONLY)
The terminals of this terminal strip are connected to identically
numbered terminals on a transfer switch terminal board. The
terminal board connects the transfer switch to the controller.
The terminal board provides the following connection points:
• N1 (Utility Sensing)
• N2 (Utility Sensing)
• T1 (Battery Charger)
• Wire 194 (Transfer Relay)
• Wire 23 (Transfer Relay)
E2
E1
E2
E1
Figure 49. Customer Connections
CONTROLLER
The controller controls all standby electric system operations
including (a) engine startup, (b) engine running, (c) automatic
transfer, (d) automatic retransfer, and (e) engine shutdown. In
addition, the controller performs the following functions:
• Starts and "exercises" the generator once every seven days.
• Provides automatic engine shutdown in the event of low oil
pressure (CorePower), low oil level (PowerPact), high oil tem-
perature, overspeed, no RPM sense, overcrank, or low battery.
Page 60
T1
N2
N1
23
T1
N2
15B
N1
(194 )
23
194
0
0
PART 4
An 18-pin and a 4-pin connector are used to interconnect the
controller with the various circuits of the DC systems. Connector
pin numbers, associated wires and circuit functions are listed in
the CHART on the next page.
If the Utility sensing voltage drops below a preset value, controller
action will initiate automatic generator startup and transfer to the
"Standby" source side.
The crank relay and fuel solenoid valve are energized by controller
action at the same time.
AUTO-OFF-MANUAL CONTROL
These three selections permit the operator to (a) select fully
automatic operation, (b) start the generator manually, or (c) stop
the engine and prevent automatic startup.
7.5 AMP FUSE
This fuse protects the circuit board against excessive current. If
the fuse has blown, engine cranking and operation will not be
possible. Should fuse replacement become necessary, use only
an identical 7.5 amp replacement fuse.
BATTERY CHARGER
(COREPOWER ONLY)
The battery charger is an independent part the generator. It has a
120 VAC input and a DC output of 13.4 VDC with a max amperage
of 2.5 amps.
AC INPUT
DC OUTPUT
Figure 50. Battery Charger
ENGINE/DC CONTROL