Meggitt vibro-meter SpeedSys300 ODS301, Руководство пользователя

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Document reference MAODS301/E USER MANUAL
Edition 4 - May 2022 SpeedSys300 ODS301 overspeed detection system
D - 7
I am getting an “Analog output readback error” message even though I am not
APPENDIX D: FREQUENTLY ASKED QUESTIONS (FAQ)
D.5 I am getting an “Analog output readback error” message even though I
am not using this output/signal in my application. Why is this?
The SpeedSys300 ODS301 module’s analog output (4 to 20 mA current loop) is one of the
module’s safety outputs so it is always monitored by the module in order to ensure that it is
working correctly.
Accordingly, the SpeedSys300 ODS301 module always expects to see current flowing in this
circuit (current loop). If it does not, then the module will detect this as a problem (error) and
put the module into its safe state. In addition:
•
On the front panel of the SpeedSys300 ODS301 module, the Error LED will show red.
• On the Device status tab in the SpeedSys300 software, the Error status will display an
“Analog output feedback error” message (Error code 00002000).
For this reason, it is important to always close the analog output circuit (loop) – even if is not
being used by an application.
If the analog output is not being used, a simply and easy way to do this is to permanently
connect a length of wire between the V+ and V0 pins of the SAFETY ANALOG / FREQ OUT
connector, thereby short circuiting the connection (closing the loop).
Alternatively, the recommended longer-term solution is to modify the configuration of the
SpeedSys300 ODS301 module as follows: on the Diagnostics tab, under Diagnostics, ensure
that both Disable analog output check and Disable analog error raising are selected.
See
2.2 SpeedSys300 ODS301 module connectors for further information on the
SAFETY ANALOG / FREQ OUT connector.