CONTREX CX-1010 - Manual (Page 10)

Page 10
Master M ode and Feedforward Scaling
In this section, the master mode is scaled for engineering units. The feedforward is
also scaled using the auto feedforward feature. Master mode scaling should be
completed even if your end application is not master mode.
The CX 1010 must convert the feedback frequency into engineering units (RPM,
Feet/min, etc.). To do this, it must "know" the ratio between encoder lines and
these units. This ratio is entered in two parts on page two of the STANDARD
SIGNALS screen. The first part is FI2 Pulses and the second part is EU FI2
(Engineering Units for Frequency Input Number Two). For example, if feedback is
coming from a one foot circumference metering wheel driving a 1000 line encoder
and engineering units will be inches, then:
1. Go to MAIN MENU\SETPOINTS\RUN MODES\.
Enter Setpoint Mode {CP 102} = Mstr.
2. Go to MAIN MENU\SCALING\STANDARD SIGNALS\P2\.
Enter FI2 Pulses {CP 167} = 1000.
3. Enter EU FI2 {CP 168} = 12.0.
Enter the desired master mode setpoint in engineering units:
4. Go to STATUS\.
Enter Master SPx = Desired speed.
Verify master mode scaling:
WARNING
Prepare the machine for motion.
Alert everyone present
5. Place the CX-1010 control into “Run”.
6. If the motor speed does not agree with Master SPx, then recalculate your
scaling terms and return to step 2.
Scale the feedforward:
7. Go to MAIN MENU\TUNING\FEEDFORWARD\.
Enter MaxFb {CP 233} = Maximum feedback engineering units.
8. Enter Kff Auto En {CP 244} = ON.
9. Wait several seconds.
10. Enter Kff Auto En {CP 244} = OFF.
11. Place the control into “F-Stop”.
Procedure complete.