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PSI System Controls and Diagnostics
18 Fault-finding
Symptom
Possible Cause
Incorrect analog input readings Cabling error
Confirmation
Solution
Check signals are connected to Use appropriate connection.
the correct pins.
Calibration incorrect or
corrupted
Check calibration values.
Unintentional or incorrect use
of the application calibration.
Check application calibration
values and whether “Use
temporary scaling” is checked.
Incorrect analog output values
Terminating impedance is too
low.
Disconnect load and remeasure.
Ensure load is within the
current compliance of the
analog outputs.
Outputs drop to zero
SAFEstate is enabled and
communication has been lost.
Check setting and state of
communications.
Check connections to
controller, status of controller.
Use appropriate SAFEstate
setting for the application.
High noise levels
Integration time too short for
signal being measured
Noise level reduces with
integration period.
Use an appropriate integration
time for the signal level.
Line voltage pickup
Noise level drops sharply if
Keep M40 and signal cables
integration period is 16.7 msec clear of unscreened high
(60 Hz) or 20 msec (50 Hz)
current mains voltage. Use
integration periods (N/line
frequency) if possible.
M40 User Manual
M40_UM_150226
Page 54 of 62
Re-enter correct values, or
contact supplier or Pyramid
Technical Consultants, Inc. if
no problem found.