CHAPTER 2. INSTALLATION 21
Deceleration time
0.1 to 5 secs.
Clock output
Low-going pulse 12
µ
S wide.
Input circuits
4K7 min. impedance to +12V.
Logic 1 level +11V to +30V or open-circuit.
Logic 0 level less than +1V at 3mA or short-
circuit to 0V.
Output circuits
Open-collector transistors referenced to 0V
and capable of switching up to +30V at
15mA maximum.
Power requirements
+24V +/-15% at 135mA max.
Functional
Description
Figure 2-7 shows a sequence of operations which illustrate most
aspects of the system behaviour. The uppermost waveform is the
"motion profile" which shows how the speed and direction of the
motor vary with time, and underneath are the various control
waveforms. By considering the motion profile in stages the operation
of the oscillator should become clear.
The system starts off at rest, and at point A the Slow speed is called
up by the Slow speed input going to logic 0. The motor is able to
start immediately at the slow speed since this is set within its
start/stop range. At B the input command is removed so the motor
stops.
At C both the Home and Fast inputs are taken low, causing the
motor to start at the Home speed and immediately accelerate up to
the Fast speed which is reached at D. At E the Fast input is
removed but the Home input remains, so the motor decelerates until
it reaches the Home speed at F and then continues to run at this
speed until the Home input is removed at G. The portion between C
and G would be a typical motion profile for a positioning system;
most of the travel is covered at high speed, and shortly before the
target position is reached the motor slows to a speed within the
start/stop range. The motor then stops when the correct number of
steps have been performed.
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