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Foot Pedal - Troubleshooting Guide - CHC

Service Foot Pedal - Troubleshooting Guide - CHC
Recently Updated Last updated: 12/16/2020

Foot Pedal - Troubleshooting Guide - CHC


Foot Pedal - Troubleshooting Guide - CHC

Jump to Section 1. Introduction 2. Symptom Table 3. Chips on the Pedal 4. Foot Pedal Flag Adjustment 5. Foot Pedal Cable Inspection Back to Top

Introduction

The foot pedals allow the operator to manually perform the following hydraulic functions:

  • Chuck Clamp and Unclamp
  • Steady Rest Clamp and Unclamp
  • Tail Stock Positioning
  • Tailstock Quill Positioning

Symptom Table

Symptom Possible Cause Corrective Action
The foot pedal is not actuating the chuck. Chip stuck in sensor. Check if there are chips in the sensor.
The pedal spring is broken. Check pedal spring
Cables are damaged or not connected. Check if the cables are damaged or connected.
The metal switch flag is not actuating the switch. Check the foot pedal switch flag when the pedal is actuated, make sure the metal flag actuates the switch. See foot pedal flag adjustment section below.
The foot pedal is not actuating the steady rest or tailstock. Chip stuck in sensor. Check if there are chips in the sensor.
Cables are damaged or not connected. Check if the cables are damaged or connected.
The metal switch flag is not actuating the switch. Check the foot pedal switch flag when the pedal is actuated, make sure the metal flag actuates the switch. See foot pedal flag adjustment section below.

Chips on the Pedal

Corrective Action: Check if there are chips in the sensor. Check pedal spring

  • Blow air into the pedal to remove chips in the proximity sensor. If the issue continues open the pedal to check if there are any chips interfering with the sensor.
  • Check the pedal spring [1] and check for tension. Replace if necessary.

Foot Pedal Flag Adjustment

To adjust the foot pedal flag push down on the flag [1] until the normally open switch lever [2] fully releases. Press on the foot pedal and listen for a clicking to ensure the flag and switch lever are properly actuating. 

Foot Pedal Cable Inspection

Corrective Action: Check if the cables are damaged or connected.

  • Push [PARAMETER/DIAGNOSTIC] button on the control.
  • Scroll over to the I/O Diagnostic tab.
  • Check that the CONTROL_FOOT_PEDAL input bits (located on the left side column in the I/O input section) are toggling from 1 (normal state) to 0 when the foot pedal is pressed.
  • If the bit is not changing state make sure the cables are not damaged and are seated correctly. If no damage is visible then you can jump the pins at the connection where the foot pedal connects to the sheet metal.
    • If the bit does change state then replace the foot pedal switch.
    • If the bit does not change state then you need to jump the pins on P19 on the I/O board.
    • If the bit now changes state then you need to ohm the cable from the enclosure to the I/O input P19.
    • If the bit still does not change state then you need to diagnose the I/O board. See I/O board diagnostic procedure.
    • If the cable fails to ohm out correctly then replace the cable.
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