This guide covers replacing the Haas Z-axis servo motor cables — the power/brake cable and the encoder cable — using service kit 93-4962. Read the safety warnings fully before starting.
Jog the Z-axis up near the top of travel so the Z-axis motor is easy to access, then press [Power Off] on the Haas pendant to power down the machine.
- Turn off all power to the machine at the source.
- Perform a Lockout–Tagout (LOTO) procedure so power stays off during service.
- Verify power is disconnected using an AC voltage detector on all incoming lines.
If you are unsure how to safely disconnect power or perform LOTO — do not proceed; contact qualified personnel first. Failure to follow these precautions may result in electric shock, equipment damage, or fatal injury.
1. Disconnect the Cables at the Motor
- With the machine fully powered off, remove the Z-axis motor power and encoder cables from the motor.
- Use a small Phillips screwdriver to loosen the encoder cable connector and the power cable connector from the motor (the connectors can be accessed from above the machine).
- Once the screws are loosened, disconnect the connectors.
- Separate the motor cables from the cable ties routing them to the electrical cabinet — these will be replaced with the new kit cables.
2. Disconnect the Cables in the Electrical Cabinet
- Disconnect the Z-axis encoder cable from channel 3 on the right side of the Maincon PCB. Remove the ferrite filter from the cable.
- Disconnect the Z-axis motor power cable from the Z-axis servo amplifier, and disconnect the ground from the chassis below the amplifier.
- Disconnect the Z-axis motor brake cable (part of the power cable) from P3, P4 or P5 on the I/O PCB — it can be on any of these connectors.
- Remove the old cables from the machine.
3. Install the New Cables in the Cabinet
- Connect the new encoder cable 32-2373B to channel 3 on the Maincon PCB. Install the ferrite filter onto the new cable in the same position as the other axis encoder cables.
- Connect the new power cable 32-1368 to the Z-axis amplifier, and connect the ground wire to the chassis below the amplifier.
- Connect the other end of the power cable 32-1368 to the I/O PCB at P3, P4 or P5.
- Route both the encoder and power cables out of the cabinet and up toward the top of the column to reach the Z-axis motor.
Connect the cables to the motor
- Encoder cable → the connector on the top of the motor; the angled connector should point down and to the right when installed.
- Power cable → the middle of the motor; orient it so the cable feeds down toward the motor shaft.
4. Check the Cable Clamp
Check the clamp that holds the power cable to the chassis. It must be the exposed steel clamp — not a rubber-insulated clamp. If the clamp is rubberized, replace it with the steel clamp 59-1600 from the service kit. Make sure the steel sits on the exposed cable shielding, not on the rubber insulation of the cable.
5. Power On & Verify
With the cables installed, power on the machine and confirm it runs without generating any alarms. Jog the Z-axis slowly to check for smooth motion and correct feedback.
Need the Cables or Kit?
JJ Automation supplies the full Haas Z-axis cable kit and components — 93-4962 service kit, 32-1368 power/brake cable, 32-2373B encoder cable and 59-1600 steel clamp — plus all Haas servo cables, new and tested used / refurbished, 100% checked, with warranty.
- 📞 Call / WhatsApp: +91 8802212394 ✉ jj.automation@outlook.com 🌐 www.jjautomation.in
This procedure is a general guide. High-voltage cabinet work must only be done by qualified personnel — if in doubt, have a JJ Automation technician or your HFO carry out the work.