Instruction Manual Supplement
D103801X012
DVC6200 SIS
January 2014
2
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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