A Power Brick AC PBA4-AA005A-0100010 can produce motor motion with #1 out 10, but the same axis does not move with #1J+. No error appears, and the following-error count does not increase. This evidence confirms an operating output stage at the tested open-loop command; it does not confirm that the position loop, encoder interpretation, or closed-loop command path is active.
Separate Confirmed Results from Unknowns
| Observation | Engineering conclusion |
|---|---|
| Current-loop tuning was completed. | The current loop was configured sufficiently for the reported test, but position-loop readiness remains unverified. |
#1 out 10 produces motion. |
The axis can generate motion under the tested open-loop output. |
#1J+ produces no motion. |
The failure is specific to the reported closed-loop command path or its prerequisites. |
| No error is displayed. | No reported fault identifies the cause; this is not proof that every closed-loop condition is valid. |
| Following error does not increment. | Confirm that a position demand is actually being generated and that following error is being observed for the commanded axis. |
The encoder type, feedback scaling, feedback direction, loop-enable state, commanded trajectory, limits, and relevant status values were not supplied. The referenced servo-settings file is also unavailable in the evidence, so none of those items can be declared correct or incorrect.
Trace the Closed-Loop Signal Path
- Record the axis position demand, actual encoder position, following error, and loop status before and during
#1J+. Use the existing project commands or status displays; the required identifiers are not provided. - If the demand does not change, investigate command acceptance, motion enable conditions, and active limits. Do not retune the motor until a trajectory is visible.
- If demand changes but encoder position does not, verify encoder signal presence, channel assignment, feedback selection, and scaling for that motor.
- If demand and feedback change together but the motor remains stationary, verify that the displayed values belong to the commanded axis and are not derived from the same incorrect source.
- If following error changes, inspect the position-loop enable state, output limiting, feedback direction, and position-loop tuning before applying further motion.
Perform these checks first at a safely constrained output and travel condition. The evidence provides no approved test limit, so derive limits from the machine risk assessment and existing commissioning documentation.
Compare the Replacement Configuration
The former controller is a Geo Brick GBL4-C0-502-13M00000; the replacement is a Power Brick AC PBA4-AA005A-0100010. Compatibility cannot be established from model names alone. Compare the working Geo Brick project with the Power Brick AC project for each axis, focusing on motor assignment, encoder interface and feedback source, scaling, feedback polarity, commutation-related configuration, loop enables, software limits, and motion-command prerequisites.
Apply this comparison independently to the Baldor BSM80N-275AF linear-axis motors and the Hiwin TMS34-A00C rotary-table motor. Both are reported to contain encoders, but the evidence does not identify their encoder interfaces or prove that one feedback configuration is valid for all three axes.
Verification Criteria
A successful correction must show a changing position demand after the closed-loop command, corresponding encoder movement, bounded following error, and physical motion in the intended direction without an error. If demand remains unchanged, the unresolved issue is upstream of position-loop response. If demand changes while feedback does not, continue with feedback-path diagnosis rather than increasing tuning gains or output.
Open-loop test reported as successful:
#1 out 10
Closed-loop command reported as inactive:
#1J+FAQ
Why does #1 out 10 move the motor but #1J+ does not?
#1 out 10 confirms motion under the tested open-loop output. It does not verify that #1J+ creates a position demand or that the position loop and encoder feedback are enabled and correctly assigned.
Why is there no following error when the Power Brick AC motor does not move?
An unchanged following-error count can indicate that no position demand is being generated or that the wrong axis or signal is being monitored. Capture demand, actual position, following error, and loop status simultaneously during #1J+.
Is PBA4-AA005A-0100010 compatible with GBL4-C0-502-13M00000?
The supplied evidence is insufficient to confirm compatibility. Compare axis assignments, encoder interfaces, scaling, polarity, commutation-related settings, loop enables, limits, and command prerequisites against the working Geo Brick configuration.