MANUAL CONTROL
In addition to software commands for the SWIFT 100, there is also a manual control mode which will
allow motion via a joystick or a hand encoder, see commands L1 and L0.
Joystick control is invoked by connecting the joystick analogue voltage, which must be between 0 and
5V , to the edge connector input A15. Then when you enter manual mode from the host, control is
passed to the joystick.
Hand encoder motion is similarly invoked by connecting the two quadrature pulse A and B of a hand
encoder or digital potentiometer, to pins C31 and A31 on the edge connector, and entering manual mode
from the host.
---5---
LIMIT SWITCH INPUTS
The limit switch inputs can be configured in a variety of ways, the basic limits signals are L1 (positive
limit) and L0 (negative limit). They operate through an opto-isolator
for safety reasons. The main signals are subdivided as:-
LP1
opto isolator anode for L1
VLP1
voltage for opto-isolator (can be logic 5V)
LM1
opto isolator cathode for L1
LP0
opto isolator anode for L0
VLP0
voltage for opto-isolator (can be logic 5V)
LM0
opto isolator cathode for L0
Basic Configuration (MAKE-TO-STOP)
o VP------logic 5V
o LP1-------------------o
/ positive limit switch o VLP1------------------o/
o LM1-----logic 0V
This is the most basic and simplest limit switch configuration. It is used for most applications but the
user should be aware of the drawbacks.
1.
This is a make-to-stop circuit which means
that if there is a break somewhere, a poor joint or connection the motor will pass by the limit switch and
not stop.
2.
Connecting VP and LM1 to the logic's power
supply means that if the limit switch is placed in a high voltage or electrically noisy area, there is no
protection for the sensitive electronics from HV spikes.
An isolated power supply for VP , LM1 and LM0 will
remove the risk of the damage outlined in point 2. ---6---
Alternative Configuration (BREAK-TO-STOP)
o VP logic 0V
o LP1---o-------------------o
|
|
o VLP1--'
o
|
o LM0---o-------------------'
