Adjusting The Position Transmitter - Samson 3767 Mounting And Operating Instructions

Operation
5.4 Adjusting the position
transmitter
NOTICE
The starting point (zero) and upper
range value (span) must be set before

adjusting the position transmitter.

Depending on the position of the multi-pin
connector (symbol on connector: >> or <>),
the feedback signal can be set to either a
range of 4 to 20 mA or 20 to 4 mA for 0 to
100 % travel.
Fig. 15: Position transmitter
Table 10: Position transmitter
Valve movement
OPEN
á
CLOSED
44
Observed feedback signal
Signal increases á
Signal drops â
Zero point
Use the switches 1 and 2 to roughly set the
zero point and the ZERO potentiometer for
fine-tuning. The adjusted value is always
based on a 4 mA signal.
Span
Use the switches 3 and 4 to roughly set the
span, i.e. the upper range value, and the
SPAN potentiometer for fine-tuning. The ad-
justed value is always based on a 20 mA
signal.
Example:
Move the valve to the open position while
observing the position transmitter signal.
If the signal does not move in the desired di-
rection, change the position of the multi-pin
connector.
Adjust the zero point (4 mA) and span
(20 mA) for the valve positions according to
Table 10.
Direction of signal
OK
Not OK
à Change connector's
position
OK
Not OK
à Change connector's
position
Set zero/span to
20 mA Valve OPEN
4 mA Valve CLOSED
4 mA Valve OPEN
20 mA Valve CLOSED
4 mA Valve OPEN
20 mA Valve CLOSED
20 mA Valve OPEN
4 mA Valve CLOSED
EB 8355-2 EN