Flowserve 3400IQ Digital Positioner - Manual (Page 33)

33
Logix 3400IQ Digital Positioner FCD LGENIM3401-00 – 06/06
flowserve.com
Writing a zero to integral gain (IGAIN) will clear the integral summer. The integral gain can then be
returned to its original value.
Inner loop offset (IL_OFFSET): Three control numbers are summed to drive the inner loop spool
position control: proportional gain, integral summer, and inner-loop offset.
Inner-loop offset is the parameter that holds the spool in the ‘null’ or ‘balance’ position with a control
deviation of zero. This value is written by the positioner during stroke calibration and is a function of
the mechanical and electrical spool sensing tolerances. However, if it becomes necessary to replace
the driver module assembly or the software RESET calibration constants has been performed, it may
be necessary to adjust this value. The method below should be used to adjust inner-loop offset.
Or simply perform a new stroke calibration.
From the fieldbus configurator:
• Set transducer block to OOS
• Enable Diagnostic Variable access in TEST_MODE
• Send a 50 percent command.
• Set integral to zero.
• Locate the DAC_PERCENT
• Write this percentage value to IL_OFFSET
• Write original value to Integral
These tuning sets can be used to obtain initial values for Flowserve products and comparable
actuator sizes. The user may need to adjust this tuning to achieve optimal performance for a
particular application.
Table VIII: Factory Tuning Sets
Mfg. Tuning Set
GAIN_
LOWER
GAIN_
UPPER
GAIN_
MULT
lgain
Comparable
Size (in 2 )
Valtek
VFactory_A 1.0 2.0 0.05 10 25
VFactory_B 1.0 2.5 0.05 10 50
VFactory_C 2.0 3.0 0.05 10 100
VFactory_D 4.0 5.0 0.05 10 200
VFactory_E 4.0 7.0 0.05 10 300
Trooper 48 0.4 0.5 0.05 25 31
Trooper 49 3.0 4.0 0.05 10 77.5
Kammer
Trooper 48 0.4 0.5 0.05 25 31
Trooper 49 3.0 4.0 0.05 10 77.5
Automax
R1 0.3 0.5 0.05 10 3 to 5
R2 1.0 1.5 0.05 10 9 to 12
R3 1.3 2.0 0.05 10 16 to 19
R4 2.0 2.5 0.05 10 27 to 37
R5 2.5 3.6 0.05 10 48 to 75
R6 4.0 5.0 0.05 10 109