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4.1 Operating level 1
When an input signal > 3.6 mA is applied, the positioner starts up at operating level 1.
Four operating modes can be selected through manual control. TZID has a rotary switch
with positions 0, 1, 2 and 3.
Display 0 = Controlling adaptive
This operating mode is usually selected. "Adaptive" means that the controller perma-
nently adapts itself in an optimal way to the operating conditions by using an "AUTO-
tune" function.
The display shows a position between 0 and 100 %, where "0" indicates that the valve is
closed, and "100" shows that the valve is fully open. The display assignment is adjustable
(adjustment parameter).
Newly adapted values are automatically saved in the non-volatile memory at intervals.
Data storage, which only takes a short time, is indicated by the two characters "EE"
shown by the display.
Display 1 = Controlling fixed
This operating mode should only be selected if "adaptive" control does not yield a stable
control of the position until reaching the set point.
"Controlling fixed" means that the values determined by Autostroke are no longer read-
justed automatically. The display of the position as a percentage between 0 and 100 % is
the same as for "adaptive" control.
Display 2 = Manual control
In this mode the valve can be adjusted manually by pressing the "Up" (towards 100 %)
and "Down" (towards 0 %) buttons. Pressing both buttons simultaneously will cause rapid
opening/closing of the valve. The order in which the buttons are pressed defines whether
the valve is opened or closed.
The LC display shows the manually set position between 0...100 %.
IMPORTANT
Display 3 = Setting of switches (alarm limits)
This mode allows to display and adjust stroke-dependent alarm limits, provided that the
supplementary module for digital feedback is plugged into the positioner. Without the
module, this function is not active.
Displaying the alarm limits
Press briefly the "Up" (high alarm limit) or "Down" (low alarm limit) button.
The alarm limits will be shown for around 1 second instead of the current position
between 0 and 100 %.
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- The position will not be readjusted if air escapes due to a leakage.
- The configured stroke limits and adjusted speeds are not active in
manual mode.
Electro-pneumatic positioner TZID
42/18-54 EN
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