TROUBLESHOOTING
ON-LINE FAILURE
I-E96-315B
6 - 5
Table 6-1. Troubleshooting On-Line Failures
Problem
Cause
Action
HSS fails to calibrate Configuration
errors
Check the specifications for function code 150.
Verify that function code 150 is set for calibration.
HSS fails to calibrate
and there are no
configuration errors
Improper
installation
Check the installation of the HSS and related hardware.
1. Remove the HSS and check the slave expander bus dipshunt.
All the dipshunt pins should be shorted.
2. Check the switch settings on the HSS.
in Section 3 to verify that
the switches are properly set for module installation.
3. Reinsert the module in the MMU.
instructions.
4. Check the termination cable.
A. Verify that the cable is connected to the correct slot on the
MMU backplane.
B. Verify that the cable connects P3 on the HSS to P1 on the ter-
mination unit or P3 on the termination module.
5. Check the dipshunt settings on the termination unit or the
jumper settings on the termination module.
for HSS dipshunt or jumper
configuration.
6. Check the process wiring.
Verify that the process wiring is connected to the correct terminals
on the TU or TM. Refer to
for terminal
assignments.
7. Check the installation of the servo valve, hydraulic actuator,
LVDT and related hardware.
Contact the manufacturer for information about the servo valve,
hydraulic actuator and LVDT.
HSS fails to calibrate
and there are no
configuration or
installation errors
Process
hardware
Check the process hardware.
No servo drive from
the servo amplifiers
Bad connection
to the servo
valve, defective
servo valve
Check the servo valve.
1. Connect an oscilloscope to TB4 terminal 1 (terminal 32 on the
TM) and do steps 2 - 6. Then connect the oscilloscope to TB4 ter-
minal 3 (terminal 30 on the TM) and repeat steps 2 - 6. Ground the
oscilloscope on the system common.
2. Enter a position demand to change the actuator position.
