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Functions and applications
February 2023
For support see Monitor-Status view for status messages and measuring values
Monitor-Status).
Analog comparison indicates Analog error
The indications Analog 1, Analog 2, and Analog 3 on tab MonitorStatus → ServiceValues
show the current analog voltages of the three monitors.
After a correct installation of the sensors and a correct configuration of the monitors
(identical speed value for parameter Basic Settings → Maximum speed), all three
monitors display an almost identical analog voltage. If the voltages differ by more than 5%
of the maximum value, the system supervision indicates the analog error and switch off
Channel OK (see
If the configuration of all three monitors regarding the parameter Basic Settings →
Maximum speed is identical, the reason for the fault is probably in the measuring chain
sector. The following faults cause an analog error:
•
Faults at the eddy current measuring chains such as cable break, converter defects,
and/or sensor defects.
•
Mechanical changes of the sensor environment. Examples:
Distance between sensor and trigger wheel has changed because of a loosen sensor
holder.
Increased radial clearance.
Movement of the trigger wheel out of the sensor measuring range due to an axial shift
of the trigger wheel. See next item (Trigger thresholds).
•
The trigger thresholds does not fit to the input signal. Error symptom: The sensor
signal can be measured at socket Sens. but there is no TTL signal at socket Pulse.
Pulse comparison indicates pulse error
The indications Digital 1, Digital 2, and Digital 3 on tab Monitor-Status → Service-Status
show the current states of the three sensors.
See
Pulse comparison
pulse signals. If one or more of these pulse comparison functions detects a fault, the
system supervision indicates a corresponding pulse error and switches off Channel OK.
Depending on the pulse comparison function that indicates the error, remedial measures
can be taken by correcting the sensor position, replacing a sensor, readjusting trigger
thresholds, or by deactivating the advanced pulse comparison (Basic Settings →
Advanced pulse comparison).
Instable measurements, fluctuating measuring values
Instable and fluctuating measuring values indicate fault functions of the measuring chain
or incorrectly adjusted trigger thresholds.
•
When using CON 041 signal converters, check, whether the sensors are connected
correctly and that the polarity of signal and GND wire are not mixed up. In case of
exchanged connections, when the cable shield of the coaxial sensor cable is connected
to the "hot input" of the converter, the output shows strongly fluctuating values –
especially when touching the sensor cable.
150
Analog
comparison).
for the description of the four different modes of comparing the
Operating Manual
MHM-97442
(View
MHM-97442, Rev. 2.06
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