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The hardware enable is the main enable circuit. It enables all the components on the Apollo I, turns on the 5V enable
(5EN) and the 24V enable signals (24EN), and activates the hardware enable relay (HEN). When the hardware enable
is set up correctly, it will only activate when there are no emergency conditions. Tripping the emergency circuit or a
limit switch will disable the hardware enable. Remember that the emergency stop terminals must be connected for
anything to enable.
The 5V and 24V enable signals can be used for any low current applications. The hardware enable relay can be used
for higher current applications if you supply the voltage source. The signals are labeled 5EN, 24EN, and HEN on the
Apollo I terminal block TB2 as shown below.
Figure 12 Hardware Enable Signals
View the diagram below for an example of the hardware enable relay.
Figure 13 Hardware Enable Relay Example
The green LEDs (labeled Enable) turn on as soon as the breakout board detects the enable signal from Mach3. The
LEDs do not mean that the hardware enable circuit is activated. The hardware enable circuit is only activated when the
red (E-Stop) LED is on.
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