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If the LED still blinks (see chart on page 2) there is either;
•
a motor issue that the electronics interpret as a torque issue as it is current related [see ‘MOTORS’ later in this document for further
details], or
•
a mechanical gear failure in the actuator has occurred. If the actuator has suffered a mechanical failure in the gearbox, the failed gears
will cause a blockage and prevent the output shaft rotating (either at all, or partially), and this may trigger the ETL. Normally you can hear
a crunching sound if this is the case.
2) There is an issue with the actuator where it ‘thinks’ it is seeing excessive torque and activates the ETL;
Models J3C-20-S85 (H/L Series) use a brushed DC motor. Brushed motors are susceptible to carbon brush wear which can result in a
build-up of carbon brush dust. In older J+J actuators where the motor is not fitted with a dust cap, this dust covers all internals in high
cycling actuators, and/ or actuators continually working at maximum load, which can cause electronic issues that can prevent an actuator
from working, but more likely causes increased motor current draw if the dust builds up in the cavity between the motor rotor and
windings.
New in 2016 – Motor Cap
In 2016 manufactured models, J+J electric actuators had a modified motor installed that has a plastic cap fitted over the top of the motor
that will ‘collect’ the dust internally. This design change is a preventive measure from the manufacturer to try and prevent the effect of
carbon dust triggering the ETL.
