UCC T3 visual diagnostics

A visual indication of the system status is provided by four LEDs on the front panel, providing assistance in diagnosing and rectifying system faults.

LED status key	Description
	LED on (green / amber / red)
	LED flashing off / on
	LED flashing red / green
	LED off
X	Any condition

USB comms	Servo status	Probe seated	Error	Description
				No power to UCC T3
X		X		Download successful, amps not engaged E-STOP released, amps not engaged
X		X		Download failed, power cycle required
X		X		E-STOP active
X		X		Axes engaged
X		X		Dynamic braking
X	X			Scale error

UCC T3 start-up process

When powered on, a self-test and initialisation is performed.

USB comms	Servo status	Probe seated	Error	Description
				No power to UCC T3
				Power applied to UCC T3
				Waiting for download

If any of the tests fail, the failure mode is indicated on the status LEDs after about 15 seconds. When power cycling, a minimum of 10 seconds is recommended between power removal and reconnection.

After the UCC T3 has completed its self-test, the system is ready for the software to be downloaded. The sequence of the status LEDs is shown below.

USB comms active	Servo status	Probe seated	Error	Description
				Waiting for download
				Downloading, USB data being passed
X		X		Download successful