IM Supplement: SIS Locked in Safety Position Behavior During Power Interruption (DVC6200 SIS) | Fisher
Fisher IM Supplement: SIS Locked in Safety Position Behavior During Power Interruption (DVC6200 SIS) | Fisher Manuals & Guides
Instruction Manual Supplement
D103801X012
DVC6200 SIS
September 2017
SIS Locked In Safety Position Behavior During
Power Interruption
This supplement applies only to DVC6200 SIS Deenergize to Trip (DETT), PointtoPoint (420 mA) operation.
WARNING
This instruction manual supplement is not intended to be used as a stand-alone document. It must be used in conjunction
with the following documents:
Safety manual for DVC6200 SIS Digital Valve Controller (D103601X012
™
Fisher
Failure to use this instruction manual supplement in conjunction with the above referenced manuals could result in
personal injury or property damage. If you have any questions regarding these instructions or need assistance in obtaining
either of these documents, contact your Emerson sales office
FIELDVUE™ DVC6200 SIS Instruction Manual (D103557X012)
or Local Business Partner.
)
Introduction
The DVC6200 SIS digital valve controller has ridethrough capability which allows it to withstand short interruptions in
loop current during a logic solver card redundant switchover or proof test.
This is part of the DVC6200 SIS digital valve controller design and requires no configuration.
Description of SIS Locked In Safety Position
SIS Locked in Safety Position is an alert used to describe when the device is in its safety position and ready for
manual reset.
If a power interruption occurs when the DVC Power Up parameter is set for Manual Reset, it will result in the device
tripping and latching in the safety position, even after power is restored. The SIS Locked in Safety Position alert will
appear. To resume normal operation, the device may be manually reset by shorting the AUX terminals or depressing
the green button on the LCP100.
A power interruption can consist of any of the following:
a.) loop current less than 3.5 mA for greater than 40 ms
b.) loop current between 4 and 12 mA for greater than 325 ms
c.) loop current between 4 and 16 mA for greater than 325 ms if a loop powered LCP100 is also present
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DVC6200 SIS
September 2017
Instruction Manual Supplement
D103801X012
Ridethrough during a deenergization below 3.5 mA
In the case of a card switchover or card proof test, redundant Safety Logic Solver cards may interrupt electrical power,
driving the loop current to the DVC6200 SIS below 3.5 mA. If this interruption is longer than 40 ms, the DVC6200 SIS
instrument will restart. Upon restart, the DVC6200 SIS will latch in the Locked in Safety Position. If the interruption is
less than 40 ms the instrument will not reset. The pneumatics to the final control element may begin to move during
this time in response to the deenergization, however the valve will not latch in its safety position if the signal is
restored above the 12 mA cutoff in 40 ms or less.
Ridethrough during a deenergization to between 4 and 12 mA (16 mA)
Some safety logic solvers perform their card switchovers or proof tests without fully deenergizing the card, which
results in a signal change below the cutoff of the DVC6200 SIS DETT. Cutoff will occur at 12 mA (or 16 mA if a loop
powered LCP100 is present). The instrument will begin to respond to the deenergization, however the DVC6200 SIS
instrument will not Lock in Safety position if the signal is restored above cutoff in 325 ms or less.
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Cernay, 68700 France
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