How to Install the NexBot Safety STP113-012 Stepper Motor

Related Products

Tools Required

• Torque wrench (0-10 Nm range)
• Metric hex key set
• Wire strippers
• Wire crimpers
• Digital multimeter
• Personal Protective Equipment (PPE)

Article

This guide details the proper procedure for installing the NexBot Safety STP113-012 Stepper Motor (1.2 Nm) into NexBot robotic systems, including the C-5, C-10, and S-3 series. Following these instructions ensures safe installation, proper connectivity, and optimal performance for applications requiring precise motion control. Adherence to all local and facility-specific safety protocols is mandatory during this procedure.

Prerequisites

Before beginning the installation, ensure you have met the following requirements.

Safety Precautions

• WARNING: Disconnect and lock out/tag out (LOTO) all electrical power sources to the robot controller and associated equipment before performing any installation or maintenance tasks.
• Verify that all stored energy (electrical, pneumatic, hydraulic) has been dissipated.
• Always wear appropriate Personal Protective Equipment (PPE), including safety glasses and electrostatic discharge (ESD) protection.

Required Components

• 1x NexBot Safety STP113-012 Stepper Motor
• 4x M4 machine screws with appropriate length for the mounting surface (refer to your specific robot's service manual for length requirements)
• 4x M4 lock washers
• Motor coupling or pulley compatible with the motor's shaft
• Appropriate motor cable (e.g., NXB-CBL-512-011)
• Optional: Encoder (e.g., NXB-SNS-ENC521-013) and encoder cable (e.g., NXB-CBL-NET533-013)

System State

• The robot must be fully powered down and in a safe, secured position.
• The mounting location for the motor must be clean, flat, and free from debris, oils, or contaminants.

Step-by-Step Instructions

This procedure is divided into two main sections: mechanical installation and electrical connection.

Section 1: Mechanical Installation

1. Prepare Mounting Surface: Inspect the mounting flange on the robot arm or chassis. Ensure it is clean and that the pilot hole for the motor's centering boss is clear.
2. Align Motor: Carefully align the shaft of the NXB-SRV-STP113-012 motor with the drive mechanism (e.g., gearbox input, belt pulley, ballscrew coupling). Gently slide the motor into position, ensuring the motor's pilot boss fits securely into the mounting flange recess.
3. Fasten Motor: Insert the four M4 machine screws with lock washers through the motor's NEMA 23 mounting holes and into the threaded holes on the mounting flange.
4. Torque Screws: Tighten the screws in a star or cross pattern to ensure even pressure. Use a calibrated torque wrench to tighten each screw to 2.8 Nm. Do not overtighten, as this can damage the motor housing or mounting threads.
5. Install Coupling/Pulley: Slide the coupling or pulley onto the motor shaft. Ensure there is a small air gap between the motor face and the coupling to prevent axial loading. Secure the coupling to the shaft per the coupling manufacturer's instructions, typically by tightening one or more set screws.

Section 2: Electrical Connection

1. Identify Motor Wires: The NXB-SRV-STP113-012 motor has four leads for the two phases. The standard color code is as follows:

• Phase A+: Black
• Phase A-: Green
• Phase B+: Red
• Phase B-: Blue

Always confirm this color code against the datasheet provided with your motor or robot.

1. Connect Motor to Drive: Using a compatible cable assembly such as the NXB-CBL-512-011, connect the motor leads to the corresponding terminals on the stepper motor driver in the robot's control cabinet. Ensure connections are secure and that the wire terminations are properly crimped and insulated.
2. Connect Optional Encoder: If your application requires closed-loop feedback, an encoder like the NXB-SNS-ENC521-013 may be used. Mount the encoder to the rear shaft of the motor (if applicable) and connect its cable (e.g., NXB-CBL-NET533-013) to the encoder input port on the motion controller or drive. Refer to the encoder and controller manuals for the specific pinout.
3. Cable Management: Route the motor and encoder cables securely, following the robot's existing cable pathways. Use cable ties or clamps to secure the wiring, ensuring it is protected from abrasion, pinching, and mechanical stress during robot movement. Maintain proper bend radius for all cables.

Verification

After completing the installation, perform the following steps to verify proper operation.

1. Final Inspection: Visually inspect all mechanical fasteners and electrical connections to ensure they are secure. Check that all tools and foreign objects have been removed from the work area.
2. Power On: Remove the lockout/tagout devices according to your facility's safety procedures. Power on the robot controller.
3. Check for Faults: Observe the controller's status indicators or HMI for any drive-related faults or errors.
4. Perform Jog Test: In the robot's manual control mode, command a slow-speed jog motion for the axis where the motor was installed. Verify that the motor rotates smoothly and in the expected direction. If it moves in the wrong direction, power down and reverse the connections for one of the motor phases (e.g., swap B+ and B-).
5. Test Homing and Positioning: Execute the homing sequence for the axis. Once homed, command a series of small, precise movements to verify positioning accuracy and repeatability.
6. Monitor Operation: During the initial test cycle, monitor the motor for any unusual noise, vibration, or excessive temperature. The motor housing temperature should not exceed manufacturer specifications during operation.

Keywords