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4-8. Self-diagnostics
This device provides a self-diagnostics function. This is useful for troubleshooting.
For information regarding measures to take in response to each message, see “6-1.
Troubleshooting.”
4-8-1. Critical Failure
Select [Diagnostics] >> [Positioner Diagnostic Status]. You will be able to check the status
conditions shown below. If the value of this item is ON, a failure was observed.
Explanation of self-diagnostics messages (major failures)
Message Description / Cause
VTD FAULT
VTD (angle sensor) error.
The feedback lever has become detached.
The feedback lever has exceeded the allowable angular range.
The VTD connector has become detached. (For the remote type,
the cable is cut.)
RAM FAULT RAM electrical part failure
ROM FAULT ROM electrical part failure
4-8-2. Device Status
Select [Diagnostics] >> [Positioner Diagnostic Status] >> [Device Status]. You will be able
to check the status conditions shown below. If the value of this item is ON, a failure was
observed.
Explanation of self-diagnostics messages (minor failures)
Message Description / Cause
LOW IIN The input signal (current) is too low (3.80 mA or less)
EXT ZERO ACTIVE
EXT SWITCH ACTIVE
External zero/span adjustment switch is being used.
HI/LO EPM OUT The EPM drive signal exceeds the normal operating range.
EXT ZERO ACTIVE
EXT SWITCH ACTIVE
External zero/span adjustment switch is being used.
TRAVEL CUTOFF The valve is in the forced fully open/closed state.
OVER TEMP
The perceived internal temperature of the device is lower than
−45 °C or higher than +85 °C.
FIXED EPM OUT
SIMULATION MODE
A dummy input signal has been set.
MANUAL MODE
SIMULATION MODE
A dummy EPM drive signal has been set.
ALL SETTINGS
RESET
The adjustment data and setting data has been initialized.
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