Galil DMC-2X00 user manual Speed Control by Joystick

PR,,80000	Raise C
BGC
AMC
VP -37600,-16000	Return AB to start

VE

VS 200000

	BGS
	AMS
	EN
B
		R=2
4
	B	C
A			A
0	4	9.3

Figure 7.2 - Motor Velocity and the Associated Input/Output signals

Speed Control by Joystick

The speed of a motor is controlled by a joystick. The joystick produces a signal in the range between - 10V and +10V. The objective is to drive the motor at a speed proportional to the input voltage.

Assume that a full voltage of 10 volts must produce a motor speed of 3000 rpm with an encoder resolution of 1000 lines or 4000 count/rev. This speed equals:

3000 rpm = 50 rev/sec = 200000 count/sec

The program reads the input voltage periodically and assigns its value to the variable vin. To get a speed of 200,000 ct/sec for 10 volts, we select the speed as

122 • Chapter 7 Application Programming DMC-2X00