Centroid 13126, Install Manual

Page: 37 / 86

5.5 W
IRING
L
IMIT
S
WITCHES
All inputs used for Limit switches must be wired in normally closed configuration for safety.
The switch should be closed when the machine is in its operational state. Wiring any of these inputs in a Normally Open
configuration is dangerous as the machine will not stop in the event that a wire breaks. It also prevents noise from causing
spurious faults.
The I/O configuration on every machine is different. While the examples below assume mechanical switches and utilize 24VDC,
your machine may utilize different voltage levels and different type devices, such as NPN, or PNP proximity sensors. If your
devices are proximity sensors, they
MUST be 3-wire sensors , 2-wire sensors will not work.
Connect your limit switches as shown below in Figure 5.5.1.
Testing Limit Switch Wiring:
1. Power up your system.
2. Start CNC12 and press F10 to continue to the main screen.
3. In the main menu press alt + I to bring up the real time I/O display.
4. Navigate to limit switch inputs (input 1 – 8), and press the ctrl-alt-i keys to remove the bar over the input in the display.
5. Confirm that all limit switches are green when nothing is tripped. Confirm that the corresponding input turns red when the
switch is tripped.
Page 37 of 86 Chapter 5 Electrical Cabinet Wiring
Figure 5.5.1
Limit switches.