Prestartup Checks - Fisher 2502 Series Level-Trol Instruction Manual

29A2834-C
RESET ADJUSTMENT
W5637/IL/A

Prestartup Checks

WARNING
The following calibration procedure re-
quires taking the controller out of ser-
vice. To avoid personal injury and prop-
erty damage caused by an uncontrolled
process, provide some temporary
means of control for the process before
taking the controller out of service.
21A6447-A
A1903/IL
Figure 11. Controller Adjustments
Adjustment locations are shown in figure 11 unless
otherwise indicted. When performing the checks, open
loop conditions must exist. One way to obtain an open
loop is to ensure that there is no flow through the final
control element. Another way to obtain an open loop is
to disconnect the controller output signal line and plug
the output connection.
During startup, it is necessary to change process lev-
els to position the displacer from its maximum to its
minimum range of operations. Provide a means to
change the process level or interface. If the process
variable cannot be varied sufficiently, follow the in-
2502 Series
30A8943-H
A1933/IL
1E8731-C
1E8732-C
A1897-1/IL
9