Do not keep energizing an actuator that is humming against a jammed louver linkage.
Check
Confirm the actuator voltage/control signal only after checking mechanical bind.
Disconnect linkage and move blades by hand if allowed.
Inspect crank arm, set screw, torque bar, and blade linkage.
Check if long screws or frame distortion are jamming tracks.
Cycle fully open/closed before final signoff.
Steps
Confirm the actuator voltage/control signal only after checking mechanical bind.
Disconnect linkage and move blades by hand if allowed.
Inspect crank arm, set screw, torque bar, and blade linkage.
Check if long screws or frame distortion are jamming tracks.
Cycle fully open/closed before final signoff.
Say this to your foreman
The louver actuator at [location] hums but the blades do not move. I checked the linkage and it appears bent/bound. Do you want the crank arm replaced and blade travel verified before startup?