How do I wire an encoder to a PowerFlex 525 Drive via the 25-ENC-1 Card? This article describes how to wire an encoder to a 25-ENC-1 card that is installed into a PowerFlex 525 Drive. NOTE: The wiring example below if for PNP type Encoders. If you use an NPN Encoder, please wire the encoder as such; Example of a NPN Encoder (AB 2 Phase Quadrature Encoder) Out A goes to (-A) Out B goes to (-B) VCC Goes to (+V, A and B) jumped together OV goes to (CM)