Pid Synoptic Configuration - gefran 3850T Use And Installation Manual

difference between HIS and LOS. The process is modelled
with three integrators in cascade whose time constants are
KT1, KT2 and KT3. The higher these values, the slower the
system response.
To reset simulation of the analogue input, set all KT param-
eters to 0.
The Valve section lets you simulate a valve. It is sufficient
to set feedback (if present) and valve travel time, which
must be consistent with the settings of the PID in question.
The CT section (current transformer) lets you simulate an
HB alarm.
The available parameters are:
• Delay: delay between output variation and simulated
CT input variation, in ms.
• Value: value simulated with output ON (peak current).
• MinValue: value simulated with output OFF (residual
current).
• Output number: number of the digital output that con-
trols current passage in the simulated TA.

4.15.4.10. PID synoptic configuration

Synoptic section page 1 lets you set the PID operating
mode: normal, cascade, driven valve or fixed ratio regula-
tion.
The PID are displayed in default pairs (1-2, 3-4, ...). Chang-
ing the first PID number with the - and + keys automatically
updates the other.
Touch the Cascade, Valve or Ratio keys to enable that
operating mode. The enabled mode button turns green. To
disable the function, touch the button again.
When one of these modes is selected, the corresponding
symbol appears in the Base and Alarms sections, as a
reminder.
80703B_MHW_2850T/3850T_02-2019_ENG
When Cascade is enabled, the first PID controls the second
PID in the pair, which, in turn, can control a driven valve.
Trim range only appears in the case of cascade, and is
the value of the SP for the PID downstream when the PID1
output is 100.0%.
If Cascade is not enabled, the two PID in the pair are inde-
pendent and can control a driven valve, fixed ratio regula-
tion or both.
Page 2 (PID overview) displays the operating modes set for
all PID.
The operating mode is indicated by the icon next to the PID
ID number; the cascade label combines the two PID that
work in cascade.
IMPORTANT NOTE
To ensure correct functioning of the PID control functions,
all the values involved (PV, SP, scale limits, etc.) must stay
within certain limits dictated by system architecture, and
4. CONFIGURATION
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