4QD Motor Speed Controller
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4QD Motor Speed Controller
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If you inadvertently connect the battery up the wrong way round - the controller will be destroyed - in quite a spectacular manner! Only you can decide if this is likely or not: if you are making a machine for your own use then (hopefully) it is unlikely. Or maybe you can mount the batteries so connecting them backwards is difficult?
Reverse polarity protection is fitted internally to these controllers:
A external battery contactor can be easily added to the 4QD series.
A fuse in the battery line can give protection which is adequate for most purposes, although fuses are so variable that this method cannot be absolutely guaranteed. However a 25A blade fuse gives good protection even for a small controller such as the VTX-40, Porter or Uni-4.
Recomended for:
If 100% guaranteed protection is required, you can fit an external relay to any controller to do this. Details are in the manual supplied or see our FAQ sheet.
Fitting all the bits for reverse polarity protection internally into a controller can add significantly to the cost of the controller. In some ways it is a case of us, the manufacturers, protecting ourselves against you, our customers! After all we really don't like having to repair controllers! Even if it is the customer's fault!
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