ABB 216EA62 1MRB150083R1/F 1MRB178066R1/F REG216 Generator protection digital control unit

3.1 General

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Microprocessor-based position control in the TZIDC provides for

optimal results. The positioner features high-precision control

functions and high operational reliability. Due to their elaborate

structure and easy accessibility, the device parameters can be

quickly adapted to the respective application.

The total range of parameters includes:

- Operating parameters

- Adjustment parameters

- Monitoring parameters

- Diagnosis parameters

- Maintenance parameters

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3.1.1 Operating parameters

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The following operating parameters can be set manually if required:

Signal

Signal min. 4 mA, max. signal 20 mA (0 ... 100 %)

freely selectable for split-range operation

min. range 20 % (3.2 mA)

recommended range > 50 % (8.0 mA)

Action (positioning signal)

Increasing: Signal 4 ... 20 mA = position 0 ... 100 %

Increasing: Signal 20 ... 4 mA = position 0 ... 100 %

Characteristic curve (travel = f {signal})

Linear, equal percentage 1:25 or 1:50 or 25:1 or 50:1 or freely

configurable with 20 reference points.

Travel limit

The positioning travel, i.e. the stroke or angle of rotation, can be

reduced as required within the full range of 0 ... 100 %, provided that

a minimum value of 20 % is observed.

Shut-off function

This parameter can be set separately for each end position. When

the respective configured limit value is exceeded, the shut-off

function causes immediate travel of the actuator until reaching the set

end position.

When the shut-off value is set to “0”, the position is further controlled,

even in the respective end position.

Travel time prolongation

This function can be used to increase the max. travel time for full

travel. This time parameter can be set separately for each direction.

Important

This function can only be used with the pneumatics with the

safety function “fail-safe”.

Switching points for the position

This parameter allows you to define two position limits for signaling

(see option “Module for digital position feedback”).

Digital output

The alarms generated in the TZIDC positioner can be polled via the

digital output as a collective alarm.

The desired information can be selected via the operator panel or

remotely via the configuration program.

The output can be set to “active high” or “active low”, as required.

Digital input

For the digital input, one of the following safety options can be

selected. You may use the operator’s panel or configuration program

to select an option.

- No function (default)

- Move to 0 % position

- Move to 100 % position

- Hold previous position

- disable local configuration

- Disable local configuration and operation

- Disable any access (no local or remote access via a PC)

The selected function is activated once the 24 V DC signal is no

longer applied (< 11 V DC).

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3.1.2 Adjustment parameters

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The TZIDC positioner has a special function for automatic adjustment

of the parameters.

Additionally, the control parameters can be set automatically (in

adaptive control mode) or manually to optimally adapt them to the

process requirements.

Tolerance band

When reaching the tolerance band the position is considered as

corrected. From this point on, the position is further slowly readjusted

until the dead band is reached. The factory setting for this

parameter is 0.3 %.

Dead band (sensitivity)

When reaching the dead band, the position is held. The factory

setting for this parameter is 0,1 %.

Actuator spring action

Selection of the sensor shaft rotating sense (looking into the open

case), if the valve is moved to the safe position by the actuator spring

(actuator is depressurized via Y1/OUT1).

For double-acting actuators the actuator spring action corresponds to

pressurizing the pneumatic output (OUT2).

Display 0 ... 100 %

Adjusting the display (0 ... 100 %) according to the direction of action

for opening or closing the valve.

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3.1.3 Monitoring parameters

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