Siemens 1FK7042-2AF21-1QB0 SIMOTICS S-1FK7 1FK7-CT 0.82kW 3Nm 3000rpm Servo Motor

The Siemens 1FK7042-2AF21-1QB0 is a SIMOTICS S-1FK7 (1FK7-CT) permanent-magnet synchronous servo motor rated 0.82 kW at 3,000 rpm, delivering 3 Nm standstill torque (M0, 100K) from a 300 V DC link. It integrates a holding brake, carries a single-turn 20-bit DRIVE-CLiQ absolute encoder (AS20DQI), and is naturally cooled in a shaft height 48, IMB 5 (IM V1/V3) housing rated IP64.

Technical Specifications

Selection Notes

Same 300 V DC-link, 3,000 rpm winding as the brake-free variant of this frame, with an integrated holding brake — weight rises from 4.6 to 5.3 kg and shaft torsional stiffness drops from 15,500 to 11,400 Nm/rad. Use it on vertical or overhung axes where the load must hold position without drive power; on horizontal axes without a holding requirement, the brake-free winding is lighter and stiffer. Remember this winding is bus-voltage limited to 300 V — the 600 V-rated windings in the same frame apply on standard 600 V drives.

Applications

Used as the servo motor in vertical or overhung machine axes on 300 V DC-link drive systems — Z-axes, lift stations, and gravity-loaded arms — driven through a DRIVE-CLiQ-based servo drive via the AS20DQI single-turn absolute encoder interface. The integrated holding brake keeps the axis in position when drive power drops out or during an E-stop.