ECON-4 1.4.0 Global Guide
30
LINEAR NO FDB
– actuator is driven by a current, which acts against a spring which pushes the actuator
to close position. Actuator is not equipped with position feedback signal.
BRIDGE
– in principal electromotor, one current polarity moves the actuator to one position, reverse polarity
moves the actuator to another position.
Adjustment for LINEAR actuator type (typically Woodward
A. At first check the position feedback level, in case it is not within limits 0.4 to 4,6 Volts, then use the LINEAR
NO FDB adjustment.
B. Connect to ECON-4 via USB connector, using PC program WinScope.
C. Adjust the Position feedback limits in parameter group: AnalogSensors: Fdb 0 pos to voltage of feedback in
case the actuator is fully closed, and Fdb 100 pos to value of voltage when actuator is fully opened.
D. ECON-4 does not measure the current through actuator. The output signal is PWM, with adjustable
frequency. The maximum ECON-4 current is given by resistance of the actuator and power supply of
ECON-4. ECON-4 is rated to maximum 8 Amps. In case the actuator has resistance 32 Ohms and power
supply is 24V, then maximum ECON-4 current is: 24/32 = 0,75A = 750mA. This means 100% of ECON
current is 750mA. In case the maximum allowable actuator current is 250mA, then this is 33.3% of
maximum ECON-4 current. This value will be used for the maximum current limitation.
E. Choose one ActType x group, e.g. ActType 1 and adjust parameter Wiring to LINEAR, and adjust
parameters Act gain to 10%, Act int to 10% and Act der to 10%
F. Parameters: ActTypex (In this case ActType 1): ActCur 0% and ActCur 100% are not used, so their value is
not important
G. Parameters: ActTypex (In this case ActType 1): Act MaxCur is maximum allowable current, in case bigger
current is detected (in fact bigger output PWM signal is detected) for longer then: ActMaxCurDel, then the
output is limited to value ActReduced Cur. So in case we have actuator with resistance 32Ohms, ECON
power supply is 24Volts and maximum allowable actuator is 250mA, then it is recommended to adjust: Act
MaxCur = 33,3%, (24V / 32Ω = 750mA, 250mA is 33,3% from 750mA), Act MaxCurDel = 5 sec, Act
ReducedCur = 10%.
H. Adjust parameter: Main PID: Actuator Type to the actuator which you use, so in this case ActType 1.
I. Connect the actuator to ECON-4, outputs ACT+ ACT- (take care about polarity)
J. Adjust ECON-4 parameter: Main PID: ECON-4 mode to MANUAL and run WinScope recording with values:
Gas Dose and Act1 Fdbck in range 0.0 – 100.0%.
K. When recording is active, change parameter: Main PID: Act position from 0 to 10, 20, 30, .. 100 and check
the response of the actuator (via feedback signal in WinScope). In case the response is too lazy or too fast,
then update the corresponding Act gain, Act int and Act der parameters in ActTypex (in our case ActType1)
to get required response.
L. After adjustment is finished, put parameter: Main PID: ECON-4 mode to AUTOMATIC
M. Based on the chosen type of control (BIN, ANA, DATA) connect the required signal
N. Adjust all other parameters like Nominal, Idle speed, Geer teeth, Overspeed, Speed and Load PID, (to the
number which ECON-4 output you are using)
O. ECON-4 is ready for start attempt.
Adjustment for LINEAR NO FDB actuator type (typically GAC, Woodward)
A. Connect to ECON-4 via USB connector, using PC program WinScope.
B. Choose one ActType x group, e.g. ActType 1 and adjust parameter Wiring to LINEAR NO FDB
