MAN0923_Issue 3_04/15
Touchpoint Pro
Operating Instructions
130
Category
Fault / Problem
Possible
Cause
Remedial
Action
I / O channels
Cannot clear Auto
Inhibit from channel
System has exited
configuration
unexpectedly,
leaving module in
configuration state
Go to
System Configuration
, then
System Setup
. Select one
channel of the module, and select
Edit
Configuration
. Close the
popup windows and the module will automatically return to Normal
state.
AIM mV channel
has not yet been
calibrated
Calibrate the channel.
(For catalytic bead type detectors, the Touchpoint Pro controller
is necessary to complete the measuring circuit. Therefore all
commissioned mV channels remain in Inhibit state until they are
calibrated.)
Inhibit Delay is
active
Wait for the Inhibit Delay time to elapse. (If the Power-On Delay or
Fault Recovery Delay is enabled, the system will remain in Inhibit for
a period defined by the Inhibit Delay Time.) Please refer to Appendix
2 – Configurable Parameter Reference Guide for further details
Sensor /
Transmitter is
signalling Inhibit
The Sensor / Transmitter may be in a start up sequence, or may
have been inhibited for maintenance
mA input channel There is a discrepancy
between the sensor
reading and the
value displayed by
Touchpoint Pro
The mA loop
requires
calibration
Touchpoint Pro converts the 4-20 mA signal it receives from the
sensor to a gas reading. If the discrepancy is significant,
re-calibrate the 4-20 mA loop by forcing the sensor output to
4 mA then 20 mA, see Commissioning, Calibrating a mA input
channel
mA input channel Error “Calibration
Signal Too High”
occurs when
calibrating the mA loop
The parameter
“Maximum Span
Signal” has been
exceeded (default
value 20 mA)
Edit the configuration of the channel – Go to
System
Configuration
, then System Setup. Select the channel and select
Edit
Configuration
. Under
Calibration
Settings
, change the
value
Maximum
Span
Signal
. Alternatively, use a lower forced
mA value to calibrate the channel.
mA Input channel Fluctuating input signal HART
communication
with the
corresponding
field device
HART communication with the field device may appear as a
fluctuation on the incoming signal. This will clear when HART
communication ceases.
Modbus
No Modbus
Communication
Check the wiring between the Control Module terminal blocks TB6
and TB7 and the host computer system port. Try swapping over
TDA and TDB.
Check that the serial communication configuration parameters of
the host computer system and Touchpoint Pro are the same.
Ensure that the bus is correctly terminated. If this is the case
remove the bus terminators and retry communication.
Consider adding network bias resistors. Please refer to Appendix
1 - Modbus Operation for further details
Modbus
Communication data
errors
Check the data signal wiring is not routed near sources of
electrical noise. Check for earth loops. Ensure that the bus is
correctly terminated. If this is the case remove the bus terminators
and retry communication.
Consider adding network bias resistors.
If possible use an oscilloscope to examine the signals on the
highway and take appropriate corrective action.
9. Problem Solving
