Page 34QD series controller instructions.
5 Specifications
Supply voltage ‡1, ‡2 15v to 56v 48v version
Supply current 70mA at zero speed
Output voltage 36v to +36v J/S mode
(36v version) 0 to 36v S/E mode
Output current, max 330A typical
Current adjustment 330A to 70A typical (cold)
Reverse current, max 270A typical (cold)
Overheat cut out 95°C internal temperature
Ramp time .3 to 12 secs accel & decel rates independently adjustable
Reversing threshold 7v approx (J2 in place)
4v approx (J2 open - factory default)
Switching frequency 20 kHz approximately
Overvoltage engage 68v 48v versions
Undervoltage 14 - 40v approx adjustable
Size 280 mm x 103 mm x 60 mm
Weight 1685g (of which heatsink is 725g)
Input 5kΩ to 20kΩ Joystick or pot.
or 0-3V (Adjustable) for-full speed
Pot fault detection 40KΩ typically
Mode switch Single ended or Joystick
Brake output 1A tripped ‡3
Deadband With Issue 15 control boards, the zero speed deadband can be
altered. This is beyond the scope of this manual but is fully explained on our www site.
http://www.4qd.co.uk/serv/4qd_transfer.html 4QD series: removing input dead band.
Do not touch the Deadband header unless you understand its purpose.
‡1 Minimum voltage subject to alteration of the undervoltage setting.
‡2 Controllers are factory-set to operate on 24v as this is the most common usage. See page 6.
‡3 Brake output is 'trip' protected: wiring or solenoid faults will switch off the controller.
Additional Information
Although this manual is quite comprehensive, there is a limit to what it is sensible to print on paper. If you
have queries, then you are best advised to consult our www site where there is a large amount of additional
information including many instructions on some of the more arcane applications of this controller
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