Honeywell VRX180 Manual De Usuario

All soak segments have a beginning VALUE and a TIME during which that value is maintained.  This is 
true regardless of the ramp type used. 

Guaranteed soak will Hold the profile value if either PV to the profile (typically a Control Loop’s PV) 
deviates specified amounts above or below the profiler output.  See Figure 5-7.  For a guaranteed soak 
to occur, the following conditions must be met: 

1.  The GUAR SOAK #1 and GUAR SOAK #2 prompts for the segment (ramps and soaks) must be 

enabled (set to ON),  

and 

2.  The GUARANTEED SOAK discrete input to the profile must be enabled (level high). 

If either of these are disabled, a guaranteed soak cannot occur, even with excessive deviation between 
profile and PV. 

This parameter specifies the amount the deviation between profile and PV must be reduced before the 
profile resumes running after a guaranteed soak.  See Figure 5-7. 

After a guaranteed soak the profile will resume running when the deviation has decreased by this 
amount. 

The following examples assume GUARANTEED SOAK is ON(1), and the example segment’s GUAR 
SOAK #1 is ON(1). 

Example #1 

Assume PV #1 is 20 units above the profile output, GUAR SOAK HI LIM is 15, HYSTERESIS is 5.  The 
profile will Hold because the deviation high limit is exceeded.  The profile will resume running when the 
PV #1 is 10 (15-5) units or less above the profile output. 

Example #2 

Assume PV #1 is 20 units below the profile output, GUAR SOAK LO LIM is 15, HYSTERESIS is 5.  The 
profile will Hold because the deviation low limit is exceeded.  The profile will resume running when the 
PV #1 is 10 (15-5) units or less below the profile output. 

Setpoint (VALUE of profile)

Guaranteed Soak High Limit

Guaranteed Soak Low Limit

Hysteresis

Hysteresis

Process Variable (PV#1)

Profile Segment “n”

Excessive deviation - Profile changes to HOLD State

Returned below limit and hysteresis - Profile resumes RUN

Guaranteed Soak (Segment “n”) = ON

AND

Guaranteed Soak (Profile) = ON

Setpoint deviation still within hysteresis - still on HOLD