The old PDQ wiring used a Scientific Generics controller, a lot of which are failing after many years service. The Porter 5 is a good replacement, here are some steps for fitting a Porter to a PDQ power trike.
You will need the following parts:
- A Porter 5 or 10 modified with a vertical 5 way IDC connector instead of the horizontal one [we have a version available with this already done].
- A Magura twistgrip throttle or other potentiometer arrangement [please note we have not yet managed to re-use the original PDQ hall throttle]
- A DNO heatsink [or other aluminium plate].
- 8mm x M4 pan head screws [4 off].
- A 5 position “choc block” screw connector.
- We also recommend having a voltmeter to hand! PDQs are getting quite old now and every one that we’ve had in the workshop has needed some level of diagnostics.
- Remove the existing control box and open it up, remove the old Scientific Generics controller.
- Modify a 4QD DNO heatsink so that it fits the box.
- Modify a Porter 5 by changing the horizontal 5 way IDC connector for a vertical one [we can do this for you].
- Mount the Porter onto the modified heatsink.
- Cut off the connectors inside the box for the throttle, and brake switch.
- Mount the Porter and heatsink inside the box as shown – we used 8mm x M4 screws with a couple of washers so that only half the thread of the brass insert is used.
- There are at least two versions of the box with different hole locations. When drilling the heatsink take care not to let metal swarf and dust contaminate the circuit board.
- Replace the old hall effect throttle with the Magura twist grip potentiometer.
- Use the “choc block” screw connector to wire up the throttle and brake as shown.
9. Close up the box, and mount to the frame using the other 8mm x M4 screws.
Notes: We have seen some PDQs that have the blue wire from the battery box as the positive [B+] line instead of the brown we’d expect – made us scratch our heads for a while!
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