How to Install KEB Brake: Type 38 Combistop

Video Transcript

This video is designed to show you how to install a KEB Combistop Brake.

It is our spring applied power off brake that is considered fail safe. I will be installing it on the back of a motor, but the steps are similar for all applications.

Pre-Installation Requirements

You will want to ensure the following conditions:

1. Prepare the friction surface – Use a suitable secondary friction surface such as cast iron or steel. The surface must be completely free of grease and oil. Clean only with an alcohol-based solvent. If no suitable surface exists, install a friction disc or flange.
2. Align the shaft – Ensure the shaft is properly centered with the mounting holes.
3. Clear the air gap – Verify no obstructions are present in the air gap between the magnet and armature.

Important: Perform all assembly with no power supplied to the brake.

Installation Steps

1. Mount the hub – Secure the hub onto the shaft using your shaft connection method (keyway, snap ring, or set screws in this example). Verify the hub does not contact the secondary friction surface. Install the retaining mechanism (snap ring or set screws) to prevent axial movement along the shaft.
2. Install the friction lining – Slide the friction lining onto the hub and align the splined connection.
3. Attach the magnetic system – Slide the assembled magnetic system over the friction lining and hub, aligning with the bolt holes.
4. Secure with fasteners – Hand-tighten the three head cap screws firmly.

Air Gap Adjustment

The magnetic system includes a factory pre-set air gap. However, wear or installation errors may alter this distance from nominal specifications.

Checking the Air Gap

Use a feeler gauge to measure around the entire brake circumference. If measurements fall outside the nominal specification for your brake size, adjustment is required.

1. Loosen fasteners – Slightly loosen the three head cap screws with an Allen wrench.
2. Adjust spacers – Using a wrench, turn the adjustable spacers to increase or decrease the air gap as needed. You may need to adjust one, two, or all three spacers depending on current gap measurements..
3. Re-secure and verify – Re-tighten the three head cap screws and re-measure the air gap with the feeler gauge around the entire circumference.
4. Repeat if necessary – Continue this process until the air gap meets nominal specifications.

Final Step

If equipped with the optional dust protection ring, slide it over the magnetic system. Ensure the edges seat properly in the grooves on both the magnet housing and flange.

Your KEB COMBISTOP Brake installation is now complete.