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Menu 1

Unidrive SP Advanced User Guide 37

Issue Number: 10 www.controltechniques.com

The drive can be controlled from the keypad if Pr 1.14 is set to 4. The Stop and Run keys automatically become active (the Reverse key may be

optionally enabled with Pr 6.13). The frequency/speed reference is defined by Pr 1.17. This is a read only parameter that can only be adjusted in

status mode by pressing the Up or Down keys. If keypad control mode is selected, then pressing the Up or Down keys in status mode will cause the

drive to automatically display the keypad reference and adjust it in the relevant direction. This can be done whether the drive is disabled or running. If

the Up or Down keys are held the rate of change of keypad reference increases with time. The units used for to display the keypad reference for

different modes are given below.

See also Pr 1.51 on page 41 (Power-up keypad control mode reference).

See below.

Open loop

The frequency reference resolution is restricted to 0.1Hz from normal parameters, but the resolution can be improved by using the precision

reference. Pr 1.18 defines the coarse part of reference (either positive or negative) with a resolution of 0.1Hz and Pr 1.19 defines the fine part of the

reference (always positive) with a resolution of 0.001Hz. The final reference is given by Pr 1.18 + Pr 1.19. Therefore Pr 1.19 increases positive

references away from zero, and decreases negative references towards zero.

Closed loop

As with open-loop a higher resolution speed reference can be programmed by selecting these parameters. In this case the speed will have a

resolution of 0.001 rpm.

1.17 Keypad control mode reference

Drive modes Open-loop, Closed-loop vector, Servo

Coding