The Schneider VW3A3E202 is an extended I/O card for the Altivar drive family, adding 6 discrete inputs, 2 analog inputs, 2 analog outputs, and 5 discrete outputs to the drive's control terminal block. It also carries a PTC probe input for direct motor thermal protection — the TH2+ and TH2- terminals trip at 3 kOhm and reset at 1.8 Ohm, with short-circuit detection below 0.05 Ohm, supporting up to 6 PTC probes in series.
What the I/O ratings mean for fit
The six discrete inputs (LI11–LI14 plus RP) accept 24 V DC logic with a 30 V max limit, and the RP input handles frequency control up to 30 kHz — that's the pulse-train input for speed reference from an encoder or PLC high-speed output. The two analog inputs are differential on AI3 (0–20 mA, 250 Ohm burden) and software-configurable current/voltage on AI4 (0–20 mA or 0–10 V DC, 30 kOhm impedance), both sampling at 4–6 ms with 11-bit resolution. The two analog outputs (AO2, AO3) can be set for 0–20 mA or ±10 V DC, 10-bit resolution. The five discrete outputs include two assignable logic outputs (LO3, LO4) rated 0.2 A at 24 V DC, and three configurable relay outputs (R4A, R4B, R4C) switching up to 5 A at 250 V AC on resistive loads.
The card connects via a terminal block accepting 1.5 mm² / AWG 16 wire with a 0.25 N·m torque spec. It mounts directly onto the Altivar drive's control board slot — no DIN rail required, no separate enclosure. The internal supply rails (10.5 V DC for the reference potentiometer, 24 V DC for logic) are drawn from the drive's own power bus, with overload and short-circuit protection at <0.2 A.