40
Assembly
Type 8792, 8793 REV.2
→
Connect positioner pneumatically to the actuator.
→
Switch on the operating voltage of Type 8792/8793:
→
Run the
X.TUNE
function.
11.4.3 Connection and start-up of an external 4...20 mA position
sensor (only for Type 8793 remote variant)
Process controller Type 8793 can only be used as a positioner (position controller) when an external
position sensor 4...20 mA is connected as the process actual value input is used as the input for
the external position sensor.
It is generally possible to connect any position sensor having an output 4...20 mA that has an appropriate
resolution of the position signal.
Good control characteristics are achieved when the resolution of the position sensor allows at least
1,000 measurement steps along the path to be detected.
Example: Position sensor with measurement range 150 mm;
thereof measurement range used (= stroke) 100 mm
Required minimum sensor resolution:
100 mm
= 0.1 mm
1000 steps
WARNING
Risk of injury due to improper start-up.
▶
Start-up may be carried out by authorized technicians only and with the appropriate tools.
Risk of injury due to unintentional switching on of the plant and uncontrolled start-up.
▶
Secure the device against accidental activation.
▶
Following assembly, ensure a controlled restart.
→
Connect the external position sensor 4...20 mA with terminals 1 - 4 of the process controller Type 8793
remote variant. (See chapter “12.2.3.1. Terminal assignments of the process actual value input”
Internal supply of the external position sensor by Type 8793:
→
connection according to input type “4...20 mA - internally supplied”
Separate supply of the external position sensor:
→
connection according to input type “4...20 mA - externally supplied”.
→
Attach external position sensor on the actuator.
The proper procedure is described in the instructions of the external position sensor.
→
Connect the compressed air to Type 8793.
→
Connect Type 8793 pneumatically to the actuator.
→
Switch on operating voltage of Type 8793.
english
Summary of Contents for 8792
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