Front Panel Diagnostics; Digital Diagnostics - Generac Power Systems PowerManager 004975-2 Manual

Operation
Figure 3.24 — PM-SC Menu Screen
Figure 3.25 — Typical Help Screen – Analog Help
The state of the digital
inputs (1= Active)
The state of the digital
outputs (1= Active)
18
RETURN
TO LAST
SCREEN
Figure 3.26 — Main Diagnostics Menu
Access to analog
diagnostics

3.18 FRONT PANEL DIAGNOSTICS

The manufacturer provides diagnostics through both the front
panel display and remotely through Genlink. The following text
refers exclusively 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 temporarily overridden on this screen.

3.18.1 DIGITAL DIAGNOSTICS

Inputs to the controller are internally pulled to 5v, so to activate
an input you must 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 the input to ground (0). You should see one of the inputs
change to a '1'. Inputs are numbered 1-32 to correspond with the
circuit diagram. You should refer to this diagram to see that the
correct input has operated.
Outputs from the controller are generally open collector. This
means that they sink current through a load and you will NOT
see any voltage change 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
as you are viewing this page, you will see some outputs turn on.
Note that the update rate for the screen is only about 1-2s so any
fast changing outputs will not be seen. You can override the state
of an output for a limited time with the "Operate" button. First
select which output you want to operate with the aid of the circuit
diagram (outputs 1-32), then press the operate button to turn it on
or off for 3 seconds. You can use this feature to test things like the
crank relay etc.
Access to communications
diagnostics
Select output channel
to override
Operate (override)
output for 3s