2.6 Test Motor Signal LEDs

Check List · Step 6 of 12 · Verify the XYZABC motor control signal LEDs without connecting motors

⚠️

NOTE: This test only requires observing the onboard LED indicators. No stepper motors, motor power load, or external drivers are required for this verification.

ℹ️

Objective: This step checks whether the six-axis motor control signals are output correctly. You will use the WebUI manual control page to jog each axis and observe the corresponding EN, STP, and DIR LEDs on the controller.

1

Initial Power-up

Make sure the test config.yaml has been loaded.
Power on the controller board.
Do not connect stepper motors for this test.
Check the onboard motor signal LED area for all six axes: X, Y, Z, A, B, and C.
All six EN signal indicator LEDs should illuminate after power-up.

PiBot V5.88 Ultra XYZABC EN STP DIR signal LEDs

Reference image: 13XYZABC axis EN, STP, and DIR LED indicators. These LEDs are used to verify motor signal output without connecting motors.

LED	Meaning	What to Check
EN	Enable signal	Should be ON after power-up when the axis driver output is enabled by the test configuration.
STP	Step / pulse signal	Should flash or show activity when the corresponding axis is jogging.
DIR	Direction signal	Should change state between forward and reverse jog commands.
GND	Signal ground	Ground reference for external driver signal wiring. It is not used as an LED test point.

2

Open WebUI Manual Control

Connect to the board Wi-Fi and open the WebUI at 192.168.0.1.
Open the manual control / jog control page.
Set a small jog distance and a low feed rate first.
Use the manual jog buttons to test each axis one by one.

Reference image: WebUI manual control page. Use small jog commands to test each axis signal output.

💡 A small jog distance is enough for this test. Since no motors are connected, you are only checking whether the signal LEDs respond to manual commands.

3

Axis Signal Indicator Testing

Test axes individually: X, Y, Z, A, B, and C.
For each axis, jog once in the positive direction and once in the negative direction.
Observe the corresponding LED group for that axis.
The STP LED should show activity when the axis is commanded to move.
The DIR LED should change state when switching between forward and reverse directions.
The EN LED should remain enabled during the test.

Test Item	Expected LED Behavior
Power on	All six EN LEDs illuminate.
Jog axis + direction	The corresponding STP LED shows pulse activity. The DIR LED indicates one direction state.
Jog axis - direction	The corresponding STP LED shows pulse activity again. The DIR LED changes to the opposite direction state.
Other axes	Only the axis being tested should show signal activity.

✅

Normal behavior: LED changes indicate that the controller is outputting motor control signals. This confirms the signal side of the axis output circuit before any motor or external driver is connected.

🔧 Quick Troubleshooting

If no EN LEDs turn on after power-up, confirm that the test config.yaml is loaded and the board has restarted correctly.
If the WebUI jog buttons do not respond, confirm that the controller status is not in Alarm or Hold state.
If one axis does not show STP activity, test the same axis again with a larger jog distance, such as 10 mm.
If the DIR LED does not change, test both positive and negative directions for the same axis.
If the wrong axis LED group responds, stop testing and re-check the configuration file before connecting any external driver.

✓

Expected Results

All six axis EN signal indicator LEDs illuminate on power-up.
Each axis responds to manual forward and reverse jog commands from WebUI.
The corresponding STP LED shows activity when that axis is jogging.
The corresponding DIR LED changes state between forward and reverse directions.
All XYZABC axes demonstrate proper signal output.
No motor connection is required for this verification.

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