STAC6 Drives and Microstepping Motors:
User Manual
(Discontinued Product)
• 1.22 •
1:
H A R D W A R E
CONNECTING LIMIT SWITCHES TO THE STAC6 DRIVE
The CWLIM and CCWLIM inputs are used for connecting end-of-
travel sensors. These inputs are differential, which allows use of
signals that are sinking (NPN), sourcing (PNP) or differential (line
driver). By connecting switches or sensors that are triggered by the
motion of the motor or load, the motor can be forced to operate
within certain limits. This is useful to prevent a program or operator
error causing damage to a system by traveling too far.
Limit inputs are optically isolated. This allows selection of the
voltage for limit circuits of 12 to 24 volts DC. Longer wires on limit
sensors can also be accommodated, creating greater distance from
the drive, resulting in less noise reduction to the drive electronics.
The schematic diagram of the limit switch input circuit is shown
below.
STAC-6 LIMIT INPUT DIAGRAM
Figure 1.22: STAC6 Limit Input Diagram
