Burkert Type 8793 - Manual (Page 25)

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External position sensor (remote)
Type 8792, 8793
12.2.1 Remote Sensor Type 8798
→
Connect the 3 or 4 wires of the sensor cable to the designated
screw-type terminals of Type 8792/8793.
Connection of screw-type terminals: (see chapter “14.6.4
Terminal assignment for external position sensor (for remote
model only)”.
Connection of M8 circular connector
(only for PROFIBUS and DeviceNet):
se chapter “15.3.3 X4 - M8, 4-pole socket, optional -
remote sensor (for remote model only)”.
→
Attach remote sensor on the actuator.
The correct procedure is described in the brief instructions for
the remote sensor.
→
Connect compressed air to Type 8792/8793.
→
Connect Type 8792/8793 pneumatically to the actuator.
→
Switch on operating voltage to the Type 8792/8793.
→
Run the X.TUNE function.
12.2.2 Path sensor (for Type 8793 remote
model only)
When a 4 – 20 mA path sensor is connected, the process
controller Type 8793 can be used as a positioner (position
controller) only, as the process actual value input is used as
input for the path sensor.
In principle, any path sensor with a 4 – 20 mA output can be con-
nected which has an adequate resolution of the path signal.
Good control properties are obtained if the resolution of the path
sensor allows at least 1000 measuring steps over the path to be
measured.
Example: Path sensor with 150 mm measurement range
Of which used measurement range (= stroke) 100 mm
Required minimum resolution of the sensor:
100 mm
= 0.1 mm
1000 Steps
→
Connect 4 – 20 mA path sensor to the terminals 1 - 4 of the
process controller Type 8793 remote model. (see chapter
“14.7.1 Terminal assignments of the process actual value input”
Internal supply of the path sensor by Type 8793:
→ Connection according to input type “4 – 20 mA - internally
supplied”.
Separate supply of the path sensor:
→ Connection according to input type “4 – 20 mA - externally
supplied”.
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