Product Description:

The RZM01.1-5-028 is a passive motor filter supplied by Bosch Rexroth Indramat as part of the RZM Motor Filters series. In an automation cabinet it is wired in series with the motor leads so that switching edges generated by pulse-width-modulated drives are smoothed before they reach the stator windings. By damping these edges, the filter protects motor insulation, reduces electromagnetic interference, and minimizes bearing currents in high-speed servo applications. The device therefore helps maintain compliance with plant-level EMC requirements without altering drive control parameters.

Electrical interface values define how the filter is selected for a given axis. It accepts a line-to-line input of 3-phase 500 V AC ±10 %, matching common 480 V class inverters while tolerating supply variation during regeneration. The highest continuous current it can conduct is 28 A; this figure also serves as the allowable motor current when the drive carrier frequency is below the thermal reference. When the inverter operates at the elevated switching frequency of 8 kHz, the permissible output current falls because copper and core losses rise, and the filter therefore dissipates up to 190 W that must be removed by cabinet airflow or heat sinking.

The current limit under typical carrier settings of 4 kHz matches the filter’s base rating, so the drive can supply the motor without extra margin calculations. At that setting, line-to-line voltage remains within the 500 V class and thermal rise stays moderate. When the switching frequency climbs, allowable load drops to 24 A, a figure that must be observed to keep winding temperature below design limits. Identification features used by maintenance staff include Design 1 and Line 1, both printed on the nameplate to separate this hardware from later revisions and to streamline replacement logistics.