4195KA, KB, KC, and KS Controllers
Instruction Manual
Form 5207
April 2007
6-3
Table 6-1. Troubleshooting Chart (continued)
Fault CorrectionCheckPossible Cause
2. Controlling off set point as
reflected by process and set point
indicators.
Note: Some offset is inherent with
proportional-only controllers
(4195KA Series). The amount of
offset is a function of the
proportional band setting
2.7 Reset valve leaks
2.7 Hold the input constant and
adjust the output to 1.0 bar (15
psig) for a 0.2 to 1.0 bar (3 to 15
psig) output or 2.0 bar (30 psig) for
a 0.4 to 2.0 bar (6 to 30 psig)
output. Close the reset valve. If the
controller output varies as the reset
valve is closed and no leaks were
found in the rest of the feedback
system (Step 2.6), the reset valve
is leaking
2.7 Replace the reset valve
(4195KB Series) or the rate/reset
valve (4195KC Series)
2.8 Leak in remote set point
system
2.8 Adjust remote set point
pressure to 1.0 bar (15 psig). Using
soap solution, check for leaks in
the remote set point and tubing
assembly
2.8 Repair or replace parts as
necessary
2.9 Input element overpressured 2.9 Check for zero shift
2.9 Replace input element and
adjust travel stops of applicable
3. Controlling off set point but not
reflected by process and set point
indicators
3.1 Controller is out of calibration 3.1 Refer to the process indicator,
remote set point (if applicable), and
flapper alignment procedures
3.1 Adjust as necessary
4. No reset action (4195KB and
4195KC Series)
4.1 Reset valve is plugged 4.1 Turn the reset valve through its
range several times to remove any
restrictions
4.1 If reset action returns, no
further action is necessary. If not,
replace the reset valve (4195KB
Series) or rate/reset valve (4195KC
Series)
4.2 Reset pressure leak
4.2 Adjust the output to 1.0 bar (15
psig) for a 0.2 to 1.0 bar (3 to 15
psig) output or 2.0 bar (30 psig) for
a 0.4 to 2.0 bar (6 to 30 psig)
output. Close the reset valve. If the
output varies and no leaks were
found in the rest of the feedback
system (see Step 2.6), the reset
valve is leaking
4.2 Replace the reset valve
(4195KB Series) or the rate/reset
valve (4195KC Series)
4.3 Tubing leak
4.3 With reset valve positioned at
.01 minute/repeat put 1.0 bar (15
psig) to the output port. Using soap
solution, check for leaks in the
reset bellows and attached tubing
assembly
4.3 Repair or replace parts as
necessary
5. Abnormal control point shift
when proportional band is changed
Note: Control point shift is inherent
when changing proportional band in
proportional-only controllers
(4195KA Series).
5.1 Flapper is out of alignment 5.1 Refer to flapper alignment
procedure
5.1 Align flapper as necessary
5.2 Flapper is dirty or pitted 5.2 Inspect the flapper
5.2 Clean, or replace flapper as
necessary
6. Controller will not attain full
output range
6.1 Output pressure gauge not
functioning
6.1 Measure the output with an
external pressure gauge
6.1 Replace the gauge if it is
defective
6.2 Supply pressure not correct 6.2 Check with an external source
6.2 Repair or replace the supply
pressure regulator, if necessary.
Replace the supply pressure gauge
if necessary
6.3 Proportional band setting too
wide (4195KA Series only)
6.3 Adjust proportional band
setting to 10. Manually cap the
nozzle. Output should increase
6.3 Use a narrower proportional
band setting
6.4 Input element or linkage failure
6.4 Inspect the element for
alignment and loose screws
6.4 Repair or replace parts as
necessary
(continued)
To Next Page
Loading...
