TOSHIBA Spot USIO21

TOSHIBA Spot USIO21

Technical data of product parameters

Diagnosing an USIO21 failure is complex. Depending on the failure, the valve may
go open, closed, or to a different intermediated position, which can be above or
below the target position. If the valve is positioned at theUSIO21 null point, an
oscillator failure would not be detected because the position feedback would
continue to be equal to zero (0) volts.
• If |(Position Feedback – Previous Position Feedback)| < MAXDELTA, and
POSITIONERRORFLAG is not set, all conditions are considered normal, and
the REDUNDANCY STATE is set to NORMAL. Previous Position Feedback
is set equal to Position Feedback prior to exiting the PI routine.
• If (Position Feedback – Previous Position Feedback) > MIN2NDRY and the
backup is OK, the VP executes the failoveIf |(Position Feedback – Previous Position Feedback)| > MAXDELTA, a USIO21
problem is suspected. VP firmware refuses to “believe” the new position
feedback value, and does not update Previous Position Feedback or run the PI USIO21
loop. If REDUNDANCY STATE is NORMAL, it is updated to POOR. If it is
POOR, it is updated to BAD. If it is BAD, and the backup is OK, the VP
executes the failover. This means that it can take 30 msec for the VP to
determine that it should execute its failover.
• If POSITION ERROR FLAG is set, and the partner’s reported position is within USIO21
LVDTTRACKING of Position Feedback, the condition is not due to a failed
LVDT, but for another reason. No action to fail over is taken.
• If POSITION ERROR FLAG is set, and both Position Feedback voltage and
Previous Position Feedback voltage are equal or close to zero volts, the problem
is suspected to be a failed oscillator, or broken oscillator wire, and the failover
is executed as long as the Backup is OK.

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