Skip to content
4QD - Electronic speed controllers for DC battery powered electric motors

phone +44 (0) 1487 450520

email esales@4qd.co.uk

cart Shopping Basket

  • Home
    • About us
    • My Account
    • Testimonials
  • Controllers
    • Controller Range
    • How to Choose a Controller
    • Porter Range
    • DNO Range
    • Pro-150
    • 4QD Range
    • Controller Comparison Charts
  • Accessories
    • Accessory Range
    • Throttles (pots)
    • Interfaces
    • Cables
    • Battery Meters
    • Switches
    • Fuses & Protection
    • Connectors
    • Heatsinks
    • Miscellaneous Parts
  • Applications
    • Model Locomotives
    • Golf Carts
    • Electric Vehicles
    • Electric Boats
    • Industrial Machine Control
    • Robots
  • Support
    • Manuals
    • Troubleshooting
    • Service
    • Knowledgebase
    • Glossary
  • FAQs
    • Technical
    • Ordering & Delivery
  • News
  • Contact
  • Current models
    • DNO
    • DNO Version history
    • Disabling regen braking [DNO]
    • Double Heading Wiring Diagram [DNO]
    • Driving the DNO by Raspberry Pi
    • Positional Servo Control [DNO / VTX]
    • Wiring for Hand Control and Radio Control
    • Wiring for Push Button Use
    • Pro-150
    • Pro-150 Pt Fault Code
    • Pro-150 Mechanical Information
    • Pro-150 Basic Wiring Diagram
    • DMR-203: Use with PRO-150 Controllers
    • Pro-150 Capacitor Modification
    • PRO-150 Issue History
    • PRO-150 Current Limit
    • Wiring for Push Button Use
    • PRO-150 Joystick Programming
    • Double Heading Pro-150 / 4QD series
    • 4QD
    • Battery Contactor
    • Adjustment for 48V
    • Overheating in Boats
    • Converting Parking Brake to Brake Light
    • Disabling HPLO on Early 4QD Models
    • Inhibit Ramp Modification [4QD series]
    • Over voltage protection in the 4QD series
    • Deadband Removal
    • How to dismantle the 4QD series
    • Testing the 4QD Base Board and MOSFETs
    • Reverse Acceptance Threshold [RAT] Modification
    • 4QD version history
    • Current limit resistors
    • Control Board Modification [Pre June 2010]
    • Use with Tacho Feedback Board
    • 4QD Series: Use with Series Wound Motors
    • Forward / Off / Reverse Mode (4QD Series)
    • Fault finding on the 4QD series
    • Reversing Latch Modification [pre issue 16]
    • Reverse Speed Modification [pre issue 17]
    • Damage from a Reversed Battery (4QD Series)
    • Mixing 4QD 150 / 200 / 300 series boards
    • Inhibit
    • Double Heading Pro-150 / 4QD series
    • Porter
    • Porter Current Limit Adjustment
    • DMR-203 Radio Control of a Porter 5 / 10
    • Pro-120 Mk2
    • Current Limiting in the Pro-120 [and others]
    • Pro-120 Mk2 History
    • Pro-120 Key Components
    • Modifying the Pro-120 for other voltages
    • Pro-120 Modification to give Uni-Directional Control
    • Pro-120 Robot Wars Version
    • Pro-120 Ignition Options
    • Earth Fuses: Why Do They Blow?
    • Pro-120 Fault Finding Tips
    • PRO-120 Ramp Reduction
    • Fitting Expansion Connector
    • PRO-120: Multiple Slaves
    • Internal Power Supply and Protection Circuitry
    • Wiring for Push Button Use
  • Installation and Wiring Diagrams
    • Accessory Diagrams
    • DMR-203 Radio Control of a Porter 5 / 10
    • Wiring for Hand Control and Radio Control
    • Loco Wiring: Hand Control & Horn Relay Board
    • Foot Pedal
    • Application Wiring Diagrams
    • Charging a 24V System From a 12V Source
    • Radio Control Wiring Hints
    • Double Heading Pro-150 / 4QD series
    • Double Heading Switch
    • Controller Wiring Diagrams
    • Double Heading Wiring Diagram [DNO]
    • Driving the DNO by Raspberry Pi
    • Pro-150 Basic Wiring Diagram
    • Switching for Double Heading
    • Collision Detection / Auto Reversing Circuits
    • Typical Wiring for the PRO, DNO, VTX and NCC Controllers
    • Wiring for Hand Control and Radio Control
    • Wiring for Push Button Use
    • UNI / Egret Wiring Options
    • Double Heading Pro-150 / 4QD series
    • Installation Best Practise
    • Motor Noise Suppression
    • Fuses and Circuit Breakers
    • Good Wiring Practise
  • Application Notes
  • Mobility Scooters
  • Greenpower
  • Control by Microprocessor
    • Robot articles
    • Motor Suppression in Robot Wars
    • Torque
    • Starting with Robots
    • Robot Steering
    • Boats
    • Overheating in Boats
    • Recharging Under Sail
    • Golf Buggies
    • Parking Brake Voltage
    • Fraser Golf Buggies, Wiring for Pro-150
    • Golf Carts - Overview
    • Model Locos
    • Double Heading Wiring Diagram [DNO]
    • Mtroniks and regen braking
    • Towing
    • Loco Wiring: Hand Control & Horn Relay Board
    • Double Heading Problems
    • Double Heading Switch
  • Controller Features
    • Feature List
    • Pro-150 programmable parameters
    • Acceleration and Deceleration Ramps
    • Ignition Circuit
    • Inhibit
  • Technical Background Information
  • Batteries
  • What is PWM
  • Surge Currents
  • Speed Stability
  • Quadrants
  • Heat
  • Energy and Losses
  • POT Dead Band
  • Earth Track Fuse and Earth Loops
  • Waveforms and Fault Finding
  • Back EMF & Internal Resistance
    • Guided tour articles
    • Full Bridge
    • Choosing a Controller [tour 1]
    • What Does a Motor Speed Controller Do?
    • Battery current and motor current [tour 4]
    • Half bridge [tour 6]
    • MOSFETs [tour 5]
    • Switching frequency [tour 7]
    • Regenerative braking [tour 8]
    • Current limit [tour 9]
    • Heatsinks [tour 11]
    • Thermal shutdown [tour 10]
    • Power down state [tour 13]
    • Ramps [tour 14]
    • Ignition [tour 12]
    • Inhibit switch / footbrake - 4QD series only [tour 16]
    • Forward / off / reverse mode or push-button operation [tour 17]
    • Overvoltage protection [tour 18]
    • Reversing [tour 15]
    • Gain adjustment, pots, and inputs [tour 20]
    • Joystick [aka wig-wag] [tour 21]
    • Parking brake driver [tour 22]
    • Brake light driver [tour 23]
    • Pot fault detection [tour 24]
    • High pot lockout HPLO [tour 25]
    • Undervoltage cutback [tour 19]
    • Main capacitor [tour 27]
    • Radio control interface [tour 28]
    • Reverse polarity protection [tour 26]
    • Tacho generator feedback [tour 29]
    • Voltage following [tour 30]
    • Double heading [tour 31]
    • Mosfets [failure modes and replacements]
    • MOSFET Failure Mechanisms
    • Voltages
    • 48V and Above
    • What Voltage Should I Use? [12, 24, 36, or 48V]
  • Accessories
  • DMR-203 Drop-Out Fault
  • Tacho Set-Up
    • Joysticks
    • Joystick Suppliers
  • Motors
  • Motors in Series and Parallel
  • Motor Manufacturers
  • Motor Matching
  • Motor Examples
  • Motor Types [detail]
  • Motor Types Overview
  • Motor Rating Background Information
  • Old Controllers
  • PCB numbers
    • 1QD
    • 1QD Speed Controller
    • 2QD
    • 2QD Speed Controller
    • Eagle
    • Eagle Speed Controller
    • Egret
    • Egret Speed Controller
    • NCC
    • Fitting Expansion Connector
    • Ramp Timings (NCC)
    • Damage from Reversed Batteries (NCC/VTX)
    • Internal Power Supply and Protection Circuitry
    • NCC Speed Controller
    • VTX and NCC Operating Voltages
    • NCC Circuit Description
    • VTX / NCC Fault Finding
    • NCC Mark 2 Issue Number History
    • NCC Mark 1 Issue Number History
    • NCC Key Components
    • NCC Zener Diode Failure
    • Porter 40
    • Porter 40 Speed Controller
    • Porter 40: Use with PWM Input
    • PRO-120 Mark 1
    • Pro 120 Mark 1 Speed Controller
    • Current Limiting in the Pro-120 [and others]
    • Pro-120 Mk1 History
    • Pro-120 Key Components
    • Modifying the Pro-120 for other voltages
    • Pro-120 Modification to give Uni-Directional Control
    • Pro-120 Robot Wars Version
    • Pro-120 Ignition Options
    • Earth Fuses: Why Do They Blow?
    • Battery Discharge Protection: PRO-120
    • PRO-120 Ramp Reduction
    • Fitting Expansion Connector
    • Internal Power Supply and Protection Circuitry
    • PRO 120 Mark 1 - Additional Diagrams
    • Scoota
    • Scoota Speed Controller
    • UNI
    • Uni: Disabling Regen
    • Uni: POT Track Fused
    • Uni: Alternative Voltage Usage
    • UNI: Use with PWM Input
    • UNI Speed Controller
    • UNI / Egret Wiring Options
    • VTX
    • VTX Speed Controller
    • Fitting Expansion Connector
    • Positional Servo Control [DNO / VTX]
    • Waveforms and Fault Finding
    • Damage from Reversed Batteries (NCC/VTX)
    • Internal Power Supply and Protection Circuitry
    • Wiring for Push Button Use
    • VTX Modification History
    • VTX and NCC Operating Voltages
    • VTX / NCC Fault Finding

Porter

Porter Current Limit Adjustment

It is possible to adjust the Porter current limit setting by fitting either a fixed resistor or a potentiometer across the pads circled in red below Fitting a 100k potentiometer gives an upper limit of Read More

DMR-203 Radio Control of a Porter 5 / 10

The DMR-203 can be used to give radio control of a Porter 5 / 10 at up to 24v by using the wiring shown below. The rest of the wiring should be as shown in Read More

CONTACT
4QD - Electronic speed controllers on Facebook 4QD - Electronic speed controllers on Twitter 4QD - Electronic speed controllers on LinkedIn 4QD - Electronic speed controllers on Google

Head Office:

4QD Ltd.
36 Greenfields
Earith, Cambridgeshire
PE28 3QH

Industrial Unit:

Unit 11 Meadow Drove Industrial Estate
Earith, Cambridgeshire
PE28 3QF

Sales enquiries: esales@4qd.co.uk

Technical support: esupport@4qd.co.uk

Buyers: buyer@4qd.co.uk

Webmaster: webmaster@4qd.co.uk

International: +44 1487 450 520

UK: 01487 450520

Terms and Conditions

© 4QD Limited 2017

MENU
  • Home
    • About us
    • My Account
    • Testimonials
  • Controllers
    • Controller Range
    • How to Choose a Controller
    • Porter Range
    • DNO Range
    • Pro-150
    • 4QD Range
    • Controller Comparison Charts
  • Accessories
    • Accessory Range
    • Throttles (pots)
    • Interfaces
    • Cables
    • Battery Meters
    • Switches
    • Fuses & Protection
    • Connectors
    • Heatsinks
    • Miscellaneous Parts
  • Applications
    • Model Locomotives
    • Golf Carts
    • Electric Vehicles
    • Electric Boats
    • Industrial Machine Control
    • Robots
  • Support
    • Manuals
    • Troubleshooting
    • Service
    • Knowledgebase
    • Glossary
  • FAQs
    • Technical
    • Ordering & Delivery
  • News
  • Contact