Product Description:

Danfoss supplies the 136Z1931 frequency converter as a member of the VLT FC 202 AQUA Drives series. The unit is an AC variable-frequency drive designed for pump and fan duties in water and wastewater facilities. It modulates motor speed to match flow demand, which can reduce unnecessary energy consumption when the process does not require full output. Pump-specific control functions also support applications that need regulated pressure, flow, or liquid levels.

The drive delivers a continuous output of 11 kW, equivalent to 15 HP, allowing it to operate medium-sized centrifugal machines without external gear reduction. Incoming utility power must remain within 380–480 VAC on a three-phase power network. Because the drive does not have an internal mains isolator, a suitable line disconnect must be installed upstream. The enclosure has an IP66 / NEMA 4X backplate rating, protecting the electronics against water spray and airborne particles commonly found in treatment facilities. Its printed circuit boards do not have a conformal coating, so the enclosure interior should remain dry and free from corrosive vapors. The baseline electrical configuration does not include additional A, B, C0, C1, or D option modules.

An integrated RFI filter attenuates conducted electrical emissions and helps the installation meet applicable CE limits without an additional external filter. The certified Safe Stop function removes motor torque when the connected safety circuit opens. Local interaction is provided through a graphical local control panel, which displays real-time process values and permits parameter changes at the drive. Wiring enters through a smooth imperial cable entry that accommodates North American conduit sizes while reducing wear on the entry gasket. No mains option module is installed, so appropriate supply fusing must be provided externally. Adaptation B remains in its standard configuration without additional modification.