Recommended Standard Operating Sequence for Vertical Load Holding with Servo Motors

When a servo motor is used in a vertical axis application requiring load holding, strict adherence to the following brake and servo enable sequences is essential to prevent risks such as load drifting, dropping, or mechanical impact during starting and stopping.

I. Standard Stopping Sequence (Preventing Load Drop)

1. Issue the motion stop command, ensuring the motor decelerates smoothly to a complete standstill with no inertial oscillation.
2. While the servo remains enabled and torque is still being actively output, immediately execute the brake close command to allow the mechanical brake to lock the shaft.
3. Maintain this state (servo enabled, brake closed) for a delay of 50–100ms. This ensures the brake mechanism is fully engaged and locked, preventing a partial or weak lock.
4. After confirming the brake is securely locked, finally disable the servo, cutting off the torque output.

This procedure ensures the servo maintains the position until the mechanical brake is fully effective, fundamentally preventing the axis from drifting or dropping due to gravity.

II. Standard Starting Sequence (Preventing Instantaneous Drop)

1. First, enable the servo, allowing the drive to rapidly establish rated torque and firmly hold the current position of the shaft.
2. Maintain the servo-enabled state for a delay of 50–100ms. This ensures the torque output has stabilized and the position loop is fully established.
3. After confirming normal servo torque output, execute the brake release command. Only then should forward or reverse motion commands be issued.

By establishing torque before releasing the brake, this sequence completely prevents any sudden drop of the axis or impact on the load caused by gravity at the moment of startup.

Updated on: 28/02/2026