Analog Outputs; Rpm Sensor Input; Watchdog And Overspeed; Voltage And Current Sense Input Calibration - Generac Power Systems Power Zone Pro Owner's Manual

Installation and Operation

Analog Outputs

There are two analog output signals that can be used for
control of 3rd party modules such as AVR's and
governors. They can also be used to drive diagnostics,
gauges, or other equipment. They can be configured in
the configuration files for voltage ranges of 0-10 V. #18
gauge wires are recommended for these connections.

RPM Sensor Input

There is one circuit specially conditioned to accept input
from a variable reluctance type RPM sensor. Shielded
cable is recommended for this connection. A shield
connection pin is provided for this purpose.

Watchdog and Overspeed

There is a hardware watchdog circuit that will activate
upon loss of signal from the processor. The overspeed
circuit will sense if an overspeed condition occurs in the
engine that is not detected by the controller. These
circuits provide an independent safety check should the
Main Controller processor fail. The output from these
circuits is a standard digital output (DO) that can be used
to drop out a relay (for example, in series with emergency
stop circuit). #18 gauge wires are recommended for this
connection.

Voltage and Current Sense Input Calibration

All of the analog channels can be recalibrated but are
normally calibrated in the factory. The only channels that
are recommended to be recalibrated are the voltage
sensing and current sensing channels. The reason for
this is to account for installation wiring effects. For
example the voltage sensing is performed within the
generator enclosure, but there may be voltage drops in
the external cabling/switchgear that need to be taken into
account.
14 Owner's Manual for Power Zone Pro Main Controller