On Screen Diagnostics; Main Diagnostics Menu; Digital Diagnostics; Analog Diagnostics - Generac Power Systems PowerManager PM-PC Manual

ON SCREEN DIAGNOSTICS

Generac provides diagnostics through both the front panel display
and remotely through GenLink™. The following text refers exclu-
sively to the front panel display.
The main diagnostic screen allows access to the sub screens and
also acts as the diagnostic screen for digital I/O. All of the raw
unprocessed digital inputs are displayed on this screen. Any digital
output can be overridden on this screen.

MAIN DIAGNOSTICS MENU

See Figure 8.

DIGITAL DIAGNOSTICS

Inputs to the controller are internally pulled to 5VDC, so to activate
an input, short it to ground. This will be seen as a '1' (meaning
active) on the diagnostic screen. To test equipment that is connected
to a digital input, such as a digital sensor, first display the diagnostics
menu shown above, then operate the sensor or short it out. Only one
of the inputs should change to a '1'. Inputs are numbered 1-32 to
correspond with the circuit diagram. Refer to this diagram to see that
the correct input has operated.
Outputs from the controller are generally open collector, meaning
that they sink current through a load and will NOT change any volt-
age on them when they are activated, unless they are connected
to a load. The main diagnostics display shows the current state of
the outputs which will change as the normal control program is still
running. For example, if the engine cranks while viewing this page,
some outputs will turn on. The state of an output can be overridden
for a limited time with the "Operate" button. First, select which
output to operate with the aid of the circuit diagram (outputs 1-32),
then press the operate button to turn it on or off for two seconds.
Use this feature to test things like the crank relay, etc.
The state of the digital
inputs (1 = Active)
The state of the digital
outputs (1 = Active)
Select output channel
to override
Figure 8 — Main Diagnostics Menu
Operate (override) output for 2 seconds

ANALOG DIAGNOSTICS

By selecting the analog submenu, the sensors connected to each
of the analog channels can be interrogated (Figure 9). The reading
displayed is "raw" unprocessed data and is a decimal number
ranging from 0 - 1023 representing a voltage on the input channel
of the 10 bit ADC. Some channels have different scaling associ-
ated with them in hardware. The channels are numbered and
scaled as shown below:
Figure 9 — Analog Diagnostics Menu
Use the analog help button (or GenLink™) to show which user
configurable channels are connected to which sensors.
Operation
Access to analog
diagnostics
Access to
communications
diagnostics
9