134B1730 by Danfoss

The 134B1730 is a control card produced by Danfoss within the VLT Control Cards series. Designed for insertion into a VLT drive enclosure, the board expands the drive's native I/O so that plant controllers can pass status bits, references, and alarms directly through the card connector. This lets the inverter exchange discrete and low-level control signals without separate interface modules mounted elsewhere in the cabinet. In industrial automation, that arrangement removes stand-alone signal converters and keeps the wiring bundle shorter, which reduces setup time and simplifies service access in the drive cabinet.

Within a drive system, the card is matched to the FC-102 drive, so its edge connector and parameter set suit that specific HVAC inverter. A minimum host software revision of 5.21 is required for proper operation with the host drive. The module's net mass is 0.12 kg, which adds very little weight to the enclosure hardware and makes the board easy to handle during installation. Its carton occupies 0.955 cubic decimeter, so the packaged unit remains compact in storage and transport. Identified as a Control Card, the assembly carries low-power logic and isolation components rather than power switching devices, so it adds very little thermal load to the drive enclosure.

Once boxed for shipment, the gross mass rises to 0.18 kg, which reflects the added packaging around the board. The card has no safe stop function, so it does not include an STO or SS1 circuit. That means any safety shutdown function must be handled outside the card by the surrounding drive system, because its role is limited to control and interface tasks inside the drive. As part of the VLT Control Cards range, it uses the same mounting geometry as other options in that series. It is a Danfoss part distributed through the brand's standard channel network.