Main Circuit Breaker - Replacement

Applies to machines built from: 
June, 1998
AD0286 Rev D

Electrical Cabinet - Main Circuit Breaker - Replacement - Introduction

This procedure tells you how to replace the main circuit breaker in the electrical cabinet. The circuit breaker in the kit can be different from the installed circuit breaker, but it operates the same.

 

Safety Notes
Caution: When you do maintenance or repair on CNC machines and their components, you must always follow basic safety precautions. This decreases the risk of injury and mechanical damage.

Do these steps before you do work in the machine or in the control cabinet:
  • Set the main circuit breaker to the OFF position.
  • Use an approved lock with an approved safety tag. Always follow lock-out procedures in accordance to local government rules.
  • After turning off the machine, wait at least 5 minutes before working in the control cabinet, to allow power to dissipate. Wait for the voltage indicator LED on the vector drive to go off completely.
  • Always turn off the main air supply when you work on any part of the pneumatic system.
  • Make sure to rest the spindle head on a block of wood when work is done on a vertical axis. This will prevent any unintended movement that could result in the axis falling.
  • Never alter any safety circuits on the machine.
You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes. Serious damage to the machine components can result in costly repairs. The service technicians at your Haas Factory Outlet (HFO) have the training and experience, and are certified to do these tasks safely and correctly. The repair and service work performed by your HFO is protected with a limited warranty.
danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not fully understand. If you have any doubts about doing a procedure contact your Haas Factory Outlet (HFO) and schedule a service visit.

Prerequisites

Kit Required: CIRCUIT BREAKER REPLACEMENT KIT

Breaker Amperage 15A 20A 40A 80A 125A
Kit P/N 93-2550 93-2551 93-2552 93-2553 93-2554

Electrical Cabinet - Main Circuit Breaker - Replacement

Step 1

Push POWER OFF.
danger: Disconnect the main power supply to the machine.
danger: After you disconnect the main power supply, wait for the LEDs on the early power-fault detection module (EPFDM) and the vector drive to go off fully. This may take 20 or more minutes.

Step 2

Record the color sequence of the main electrical supply wires [1] that go to the circuit breaker [2]. Disconnect the wires.

Disconnect the contactor cables [3] from the circuit breaker.

If the contactor [5] is installed on the rear of the circuit breaker, disconnect the (3) transformer cables [4] at the transformer.

Remove the circuit breaker assembly [2] from the machine.

If the contactor [5] is installed on the rear of the breaker mount bracket, remove it.

Remove the circuit breaker from the breaker mount bracket.

Discard the circuit breaker if it is not under warranty.

Step 3

Use (2) long screws [4] to attach the new circuit breaker [2] to the breaker mount bracket [1].

Select the holes on the bracket that allow the switch on the circuit breaker to fit through the hole on the locking bracket [5].

Use (3) short screws [3] to attach the locking bracket [5] to the breaker mount bracket [1].

Select the holes on the locking bracket that allow the toggle [6] to move freely.

note: The circuit breaker you receive may look different from the one illustrated. Assembly is the same.

Step 4

Do this step only if the contactor was installed on the rear of the used circuit breaker assembly.

  • Attach the contactor [1] to the contactor bracket [2].
  • Attach the contactor bracket to the top of the circuit breaker bracket.

Step 5

The bracket for the circuit breaker assembly has (2) sets of holes to attach it to the electrical cabinet.

Look at the circuit breaker.

  • If the circuit breaker is the same as a breaker in the first group [1], use the top set of holes.
  • If the circuit breaker is the same as a breaker in the second group [2], use the bottom set of holes.

Attach the circuit breaker assembly to the electrical cabinet.

Connect the cables.

Be aware: Many service and repair procedures should be done only by authorized personnel. The service technicians at your Haas Factory Outlet (HFO) have the training, experience, and are certified to do these tasks safely and correctly. You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes.

Danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not completely understand. Contact your Haas Factory Outlet (HFO) and schedule a service technician visit if you have any doubts about doing a procedure.

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