Emerson HD22020-2 high-frequency switching power DC power rectifier module

Description

For each of the three coil outputs, an HD22020-2 internal shorted bit is set if the converted value

of terminal voltage is near 0 volts. Behavior of this diagnostic changes when servo

output amplififier voltage is near zero.

Typically, the servo output coil is -200 mV when the valve is in a stable, controlled

position and the servo valve mechanical bias is HD22020-2 properly adjusted. If the servo output

amplififier voltage falls below 50 mV, the internal bit is cleared, as though no error

condition exists.

For servo output voltages greater in amplitude than 400 mV, the module status

register voltage is compared to 50 mV, and a shorted bit is set if it is HD22020-2 less. If the

shorted coil bit remains active for fifive seconds, the condition is reported to the

Controller in status word 1.

For servo amplififier voltage values between 50 and 400 mV, the comparison value is

calculated as the servo amplififier voltage divided by eight. The timing described

above is used. When the shorted bit becomes inactive, the corresponding bit in

status word 1 is cleared immediately

Diagnosing an LVDT 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 the LVDT null point, an

oscillator failure would not be detected HD22020-2 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 failover.

• If |(Position Feedback – Previous Position Feedback)| > MAXDELTA, a

problem is suspected. VP fifirmware refuses to “believe” the new position

feedback value, and does not update Previous Position Feedback or run the PI

loop. If REDUNDANCY STATE is NORMAL, it is updated to POOR. If it is

POOR, it is updated to BAD. If it is HD22020-2 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

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.

• If POSITION ERROR FLAG is set, and Position Feedback differs from

Partner’s Position Feedback by more than LVDTTRACKING, and the Backup

is OK, an LVDT problem is suspected and the failover is executed.

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