Oil Pressure Sensing; Testing The Control Panel; Open Circuit Testing; Short Circuit Testing - Generac Power Systems E Operating Manual

OIL PRESSURE SENSING

OVERVIEW
An analog Oil Pressure Sender (OPS) is used for
monitoring the engine oil pressure. This sender
allows the E panel to measure and display the Engine
oil pressure.
Refer to the owners manual for the OPS part number
and mounting location.
Wire number 69 is used to connect the OPS to the E
Panel. The Ground for the OPS is made through the
engine block.
The OPS is a resistive device, whose resistance
changes based on engine oil pressure. The resistance
of the sender results in a voltage being developed
across the sender. As the oil pressure increases, the
resistance will decrease, causing the voltage to
decrease. This changing voltage is read by the E Panel
and converted into the engine Oil Pressure.
The E Panel will monitor and display oil pressure
anytime the DC input to the E Panel is present.
TROUBLESHOOTING
Prior to any troubleshooting, the oil pressure param-
eters programmed into the E Panel should be
checked and verified. The oil pressure input has two
different set points associated with it. They are:
Pre-Low Oil Pressure Warning: This is the warning
set point. The generator's alarm will sound, but the
generator will continue to run.
Critical Low Oil Pressure Alarm: This is the alarm
set point. The generator will shut down and sound
the alarm.
It is important to verify that these parameters are set
correctly for the specific unit. Check the E Panel set-
tings against the Generator setup sheet. If the gener-
ator setup sheet is not available, contact Generac's
service department for the recommended settings.
Figure 3.1 — Oil Pressure Sender Connections
Oil Pressure Sender Connections
Refer to the unit's Wiring Diagram for specific connector locations
E Panel
E Panel
CON 2-5
+5V
Set Screw
Connector
69
69 Location on the
Control Panel
terminal strip
20 Generac ® Power Systems, Inc.
Section 3 — Troubleshooting and Diagnosis
E Option Control Panels
(Refer to Figure 3.1)
69 69
Oil Pressure
Sender
(OPS)
69 Location in the
Deutsch Connector
This Ground (0)
("Sealed Connector"
connection is
Control Panels only)
made through the
Engine Block

TESTING THE CONTROL PANEL

It is relatively easy to do a thorough test of the E
Panel's Oil Pressure input.
Place the Auto/Off/Manual switch to the Off position
during this testing.

Open circuit testing

This test checks the high end of the oil pressure input
of the E Panel.
1. Remove the 69 wire from the control panel termi-
nal strip. This simulates a sender open circuit
condition.
2. Look for the following response from the E Panel:
The back light will flash, the Com Alarm LED will
flash, and the display will read as follows:
OIL PRESS SENSE FAULT
PRESS ENTER TO ACCEPT
3. Press enter to accept the alarm.

Short circuit testing

This test checks the low end of the oil pressure input
of the E Panel.
1. Reconnect the 69 wire to the control panel termi-
nal strip.
Connect a jumper wire between the 69 and 0
positions on the control panel terminal strip. This
simulates a sender short circuit condition
2. Look for the following response from the E Panel
2.1 For units with software version V1.11 and
earlier: The back light will flash, the Com
Alarm LED will flash, and the display will
read as follows:
OIL PRESS SENSE FAULT
PRESS ENTER TO ACCEPT
Press enter to accept the alarm.
2.2 For units with software version V1.12 and
later:
Use the arrow keys to go to the Oil pressure
display screen.
The screen should display oil pressure as
125 p.s.i.
Control panel testing complete
1. Remove the jumper between the 69 and 0 loca-
tions on the control panel terminal strip.
2. If any E Panel alarms are present, press enter to
accept.
Test Results
1. Tests 1and 2 Pass:
Move on to the next test "Testing the Oil Pressure
Sender".