Flowserve Logix 1200e LGAIM0044 - Manual (Page 42)

44-42 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Calibration
Red LED blinks after a Quick-Cal oper-
ation. Valve stays in fully open or
closed position. 1. Positioner configured for Linear
operation, but mounted on a
rotary actuator
1. Feedback linkage out of range
1. See Quick-Cal Function on
page 44-33.
1. See Stem Position Sensor on
page 44-12.
Yellow LED blinks after a Quick-Cal
operation 1. Valve did not fully stroke during
calibration (low or no air supply)
1. See Quick-Cal Function on
page 44-33. or 44-16.
Rotary valve has a dead band at the
fully open or closed position 1. Mechanical travel is not cen-
tered within the electrical mea-
surement range.
1. See Linear vs. Rotary on
page 44-32. or Stem Position
Sensor on page 44-12.
Red LED after loop current calibration 1. Applied Current is greater than
21 mA
1. Current source changed
between two values
1. See Command 100% Calibra-
tion Flag on page 44-33.
Control and Tuning
Valve will not saturate at closed posi-
tion 1. MPC may need to be enabled 1. See MPC (Minimum Position
Cutoff) on page 44-38.
Valve will not travel below or above a
certain limit 1. Soft limits not enabled
1. MPC not enabled
1. See Advanced Features on
page 44-40.
Sticking or hunting operation of the
positioner 1. Contamination of spool valve
assembly
1. Incorrect adjustment of P+I set-
ting
1. See Air Supply Requirements
on page 44-31. See Spool Valve
on page 44-35.
1. See Setting P+I Parameters on
page 44-34.
Large initial deviation. Only present on
initial power-up. 1. Inner loop offset not correct 1. See Setting P+I Parameters on
page 44-34.
Stem position movement is not linear
with command 1. Custom characterization not
enabled
1. See Custom Characterization
on page 44-40.
HART Communication
Will not communicate 1. Current source problem; May
need HART filter
1. Modem connection not operat-
ing correctly
1. HART module not enabled in
ValTalk software
1. See Current Source Interfer-
ence on page 44-35.
1. See HART Modem on
page 44-36.
1. In Options, select HART proto-
col
HART 275 communicator indicates
Generic after it connects to positioner 1. Handheld not programmed with
Valtek DD
1. Contact Flowserve Flow Con-
trol Division's Houston facility at
281.479.9500.
Table IV: Troubleshooting Logix 1200 Digital Positioner (2 of 3)
Failure or Problem Probable Cause(s) Refer to Section(s)