EATON
SFX Product Family Installation and Operation Manual 6045988-001 Rev. A E-ELCL-II005-E March 2019
19
SFX Product Family
13.0
DEVICE COMMUNICATION TROUBLESHOOTING
The following is a list of things to check, in order of
priority, if you are having problems connecting to
your controller using the Universal service tool.
Make sure the device is powered up. You should see
a green light on LED A of the device. It is okay if this
is flashing (this just means the controller is currently
in run mode).
If the green light on LED A is not on:
1.
Verify power is connected to VBATT+ on
the SFX.
2.
Verify power return is connected to VBATT- on
the SFX.
3.
If the application is using the ignition pin, verify
the ignition pin is connected to power.
4.
If the application is using the sleep pin, verify
the sleep pin is connected to VBATT-.
If communication issues persist:
1. Verify all devices are connected.
2. Verify all devices are communicating at the same
baud rate.
3. Verify the correct node IDs are being used.
4. Verify the correct CAN network termination.
With power off a properly terminated CAN
network should measure 60Ω between CAN_H
and CAN_L. This is usually implemented with
two 120Ω terminating resistors, one at each end
of the CAN network backbone.
a.
If resistance <50Ω is measured
more than two 120Ω terminating resistors
are likely present on the CANbus. Find and
remove one terminating resistor.
b.
If resistance >70Ω is measured only one
120Ω terminating resistor is likely present on
the CAN network. Add a second terminating
resistor in an appropriate location.
Note: CAN1 on the SFX has a switchable internal 120Ω
terminating resistor. If this is being used CAN1 should
measure 120Ω when properly terminated.
5. Verify the CAN_H and CAN_L lines have not
been crossed.
6. With the CAN network active measure from
CANH to VBATT- and CANL to VBATT-.
a.
If < 2 volts, the respective CANH or CANL
conductor may be shorted to VBATT- or
chassis ground. Find and fix the short, then
retest the CAN communication;
b.
2.0-3.0 volts is normal;
c.
If >3.0 volts the respective CANH or CANL
conductor may be shorted to VBATT+. Find
and fix the short, then retest the CAN
communication
Note: voltage between CANH and CANL will vary between
0.45 and 0.95 volts when operating correctly.
14.0
DEVICE RECOVERY
If the SFX becomes non-responsive due to an
application issue or incorrect CAN configuration, the
SFX may need to be recovered. To recover the SFX,
first power off the SFX. Attach the service tool, and
short PWM1_2A AND PWM2_2A to VBAT (must
be > 11 V). Then power on the system with the
service tool running and attempt to connect within 3
seconds after power-on. Connecting PWM1_2A and
PWM2_2A at power on will prevent the application
from running and provides an opportunity to load a
different application.
