4QD controllers Service section and technical information
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Introduction

This is the index to all the published Service information for the 4QD series controllers.
These pages do not constitute a full service manual as one is not available.

Contents

Service Information

• Fault Finding
• Issue number and modification history

• Base board and MOSFET testing
• Base board layout (issue 10 board)
• Brake driver: modification Base board issues 8 through 10
• Current limits: 4QD-200 and 4QD-300
• Dead band - removal
• Earth track fuse and Earth loops
• Inhibit input - operation
• Main capacitor - heating. This page explains the job of these capacitors.
• Modification, Base board Issues 3 to 8
• Modification history
• MOSFETs - replacement types
• Overvoltage protection
• Parking brake driver: conversion to braking light output
• Reverse Acceptance threshold modification Top board issues 4 through 8.
• Reverse Speed Alteration
• Reversing the battery: effects of
• Servicing Dismantling etc
• Undervoltage modification
• Parking brake, modification issue 8 through 10.

Application notes

• 0-5K input with 4QD controllers
• Braking Light Driver
• Forward - Off - Reverse use
• High pedal lockout: disabling
• Series wound motors with 4QD series
• Tacho feedback with 4QD series
• Team Delta Interface

Page Information