Failsafe Mode; Accessing Diagnostic Information - GE Masoneilan SVI II ESD Installation And Maintenance Manual

Smart valve interface with sil3 emergency shutdown pst controller

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FAILSAFE Mode

Several of the internal diagnostics tests put the SVI II ESD into FAILSAFE mode if the errors

continue for a preset time. When SVI II ESD goes into FAILSAFE, the valve is driven to its

Failsafe position. It remains in that position until the cause of the error is cleared and the

instrument is reset.

Reset is performed in two ways:

Connect a HART

Turn the power off and on.

To prevent the valve from moving after reset:

Put the controller in manual, and set valve position setpoint to Failsafe position 0% if

ATO, 100% if ATC.

You can set a special case of FAILSAFE for use on critical loops to force the process to trip if a

positioner is unable to control the valve by:

Setting a Position Error Band and a Position Error Time 2 that forces valve to its failsafe

position if position error exceeds the band for a time longer than time 2.

Whenever SVI II ESD encounters an error during any operation it is reported. Dependent upon

the interface used, the SVI II ESD determines how the error is reported:

LCD, errors appear on the LCD.

ESDVue, errors are reported when running diagnostic tests and on the Status screen.

HART

display.

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=GE Oil & Gas

The positioner LCD may indicate Failsafe when an alarm condition

NOTE

exists. Use the pushbuttons to view and clear alarms. See

"Accessing Diagnostic Information" on page 136.

modem and ValVue ESD, and then click the RESET button.

handheld device, errors appears to the HART

handheld communicator

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