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STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 4054 – rev.00 02/2021 – DT2 - 20 -
6. PARAMETERS
1. INIA: Automatic initialization (Chap.5.2.2 Choosing a parameter for configuration)
By selecting “Strt” and pressing the button ▲ for at least 5 seconds, automatic initialization is started. The
initialization process is displayed by “RUN 1” to “RUN 5”.
2. INIM Manual calibration （see chapter 5.3.3）
By selecting “Strt” and pressing the button ▲ for at least 5 seconds, manual initialization is started.
3. RESERVE
4. TYPE
Type of actuator.
The actuator is a linear actuator (LINE) or rotary actuator (TURN).
5. RESERVE
6. DEBA: Dead band of the controller
At DEBA = AUTO the dead zone in automatic operation is adapted continuously to the requirements of the control
circuit. The dead zone is gradually increased on detecting a control oscillation. The reverse adaptation takes place
by a time criterion.
In the other discrete settings, the fixed value is used for the dead zone.
7. DEBA1: Dead band of the controller 1
When DEBA1 = AUTO, the DEBA1 is equal to the DEBA value, which will change according to the operating
conditions during the running process. When the valve position changes cause oscillation (such as pipeline
leakage), the appropriate increase of the DEBA1 can be alleviated. oscillation.
When DEBA1 has other values, the controller dead zone 1 is a fixed value set.
8. PRST: Preset (factory setting)
Establishing the factory settings and resetting the initialization
9.SDIR: Setpoint direction (see figure 12)
The setting of the setpoint direction serves to reverse the direction of action of the setpoint. It is used mainly for the
split range mode and in single--acting actuators with the safety position “up”.
10.SPRA: Split range start (see figure 12)
11.SPRE: Split range end (see figure 12)
In Menu P2, the parameters "10.SPRA" and "11.SPRE" and "9.SDIR" restrict the active set point range. In this way,
split range tasks can be done by the following characteristics.
• rising / falling
• falling / rising
• falling / falling
• rising / rising
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