12 Generac
®
Power Systems, Inc.
Figure 3.10 — 12 Position Terminal Block
NOTE:
PCB alarms marked with “*1” relay contact clo-
sure to ground. These contacts can be used to
switch DC voltage up to 30 VDC at 1 amp current.
3.4.13 START BATTERY VOLTAGE ALARM
This status signal indicates a low or overcharged
engine start battery. A low condition would be 10V
DC or lower, and an overload would be 14.5V DC or
higher. This alarm contact is normally open.
3.4.14 SWITCH NOT IN AUTO ALARM
This signal indicates that the Manual/Off/Auto switch
is not in the auto position and will not start in the
event of utility failure.
3.4.15 GENERAL FAILURE ALARM
This alarm signal indicates a forced shutdown due to
an engine fault (see Protective Shutdown Circuits,
Page 13). This alarm contact is normally open.
3.4.16 ENGINE RUN ALARM
This status signal indicates that the engine generator
is running and producing an output. This alarm con-
tact is normally open.
3.4.17 PROTECTIVE SHUTDOWN CIRCUITS
The printed circuit board on the control panel moni-
tors a number of inputs from the engine. Should a
problem in the operation of the engine arise, the cir-
cuit board will shutdown the unit to prevent cata-
strophic failure. The protection circuits include the
following:
• Low oil pressure shutdown - below 10 PSI
• High engine temperature shutdown - above 284º F
• Overspeed shutdown - above 3225 RPM
• Overcrank shutdown - allows the unit to attempt
to start in cycles for approximately 90 seconds
then locks out the starter.
3.4.18 UTILITY SOURCE VOLTAGE
The control panel requires a 240V input to monitor
the utility voltage.
• N2 - 240V AC
• N1 - 240V AC
• Ground Utility
3.4.19 BATTERY CHARGER
The control panel circuit board also contains an
engine start battery charger. This charger only oper-
ates while utility voltage is present. The charger pro-
vides a 1.5A maximum trickle charge. This charger is
only to keep the battery voltage floating while the
engine is stationary. During engine running periods,
the battery is charged via a winding in the stator
through a regulator at a maximum charge current of
7.5 A.
3.4.20 EXERCISE TIMER
In order to maintain system reliability and to perform
secondary functions such as engine lubrication and
battery charging, the unit is fitted with an electronic
programmable timer which, once programmed, will
exercise the generator at customer specific intervals
(Figure 3.11). For information on the programming of
the timer, see the separate Operating Instructions
supplied with each unit.
Generac strongly suggests that the unit be exercised
for a minimum of 30 minutes at least every seven
days.
Section 3 — Operation
Generac APS 6.0 DC Auxiliary Power System
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