Scaling The Motor Speed, Open Loop Control; Closed Loop Speed Controller; Operating The Ds9000 As A Set-Point Controller - Seco DS9000 Installation & Operation Manual

speed potentiometer. The DS9000 is not comparing the feedback signal with the reference signals as it
would in "closed-loop" operation.
1. Set Dip SW#2 in the ON position. This sets the DS9000 in the "Open Loop" or manual mode
of operation. If you have not removed the speed pot from the drive that you used to start the
drive in Section 2.5, do so now. Replace the pot with connections from TB3-1 and 2 as
described in Section 2.7.2.
2. Apply AC power to the motor controller and the DS9000.
3. Set the speed, PS1 to 0. Check that TB1-4 and TB1-5 are not connected to circuit common
(TB1-9 or TB1-12). This selects PS1 as the active set point parameter.
4. Start the DS9000 and motor controller via the Start/Stop method you are using, either three-
wire or two-wire Start/Stop.
5. The "HI Adjust" LED should be on, if not press HI/LOW key to turn it on.
6. Press the UP key repeatedly to slowly increase the speed of the motor to 1400 RPM. The
"OPLP" error code will be displayed since you are running "Open Loop". In this case that is
the normal display and not an indication of an error.
7. Press the TACH/REF key to toggle between the desired speed, 1400 RPM and the actual speed
from the pulse generator. The "TACH" LED will be lit when the actual speed is displayed, and
the "REFERENCE" LED is lit when the programmed speed is displayed.
8. With the actual speed displayed, "TACH" LED lit, adjust the max speed pot of the motor
controller until you read 1400 RPM or as close as you can set it. This scales the motor
controller to the DS9000 analog output.
9. Press the DOWN key until you reach zero speed.
10. Stop the motor controller and DS9000. You can see that the DS9000 is stopped if neither the
"TACH" nor "REFERENCE" LEDs are lit.
2.7.5

CLOSED LOOP SPEED CONTROLLER

To provide "Closed Loop" speed regulation, that is to allow the DS9000 to compare the programmed
speed to the actual speed and correct any error, put Dip Switch 2 in the OFF position. If you are using
the DS9000 as a Set-Point controller, proceed to section 3.0. If you are using the DS9000 as a follower
controller, refer to section 4.0.
3.0 RPM PROGRAMMING/READOUT
In the setpoint mode of operation, the DS9000 acts as a precision speed reference for a DC drive and
motor. A speed in RPM or engineering units is entered by the operator using the keypad, and the
DS9000 outputs a reference to the motor controller. Digital feedback is used to compare the set point
to the actual speed, to correct the speed to within +/-1 RPM and to display actual speed in RPM or
engineering units.
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