SIEMENS6RB2100-0NA21Simodrive 210 DC Feed Drive Closed-Loop Analogue Control PCB, 3 Axes, Drawing 462 110.9070.21

Product Description

What this part is

A Siemens 6RB2100-0NA21 — the closed-loop analogue control PCB for a Simodrive 210 DC feed drive, in the three-axis configuration. It carries the speed and current regulators for the feed axes: it takes the analogue speed command from the CNC, closes the loop against tachometer feedback and issues the firing commands to the DC power section. It is a regulator board, not a power stage and not a power supply.

Correcting the source data

The 6RB2 prefix is Simodrive 210, the DC feed-drive family, not the AC Simodrive 610 range (6SC61…). The two generations share the same Siemens 462-series internal drawing scheme and are frequently listed interchangeably by resellers, but they regulate different power sections — a 210 DC control board will not run a 610 AC feed drive module. Match the drive family before ordering.

Decoding the order code

6RB2 — Siemens Simodrive 210 DC feed drive family100 — control electronics (Funktionsbaugruppe / control PCB) group0NA21 — closed-loop analogue regulation, three axes462 110.9070.21 — the Siemens internal board drawing number silkscreened on the PCB; this is the number to match against a board already in the machine

Published specifications

Type: feed-drive closed-loop control PCB (regulator board)Drive family: Simodrive 210, DC feed driveAxes served: 3Control method: analogue closed loop — speed regulation against tachogenerator feedback, with current/torque limitCommand interface: analogue speed setpoint from the CNCInternal drawing number: 462 110.9070.21Form: plug-in / rack-mounted PCB within the Simodrive drive chassisOrigin: Germany (Siemens nameplate)

What these specs mean in practice

Three axes on one board means one board failure takes three feed axes with it — and equally, one board covers three axes, so you need fewer spares than an axis-per-card architecture suggests. Because the loop is analogue and closed on a tachogenerator, drift and gain faults show up as axis hunting or following error rather than as a hard alarm; the regulator trim pots on this generation of board are set to the machine, so a replacement will need the loop gains and offsets re-trimmed rather than dropped in blind.

Installation and setup notes

Match the 462-series drawing number as well as the order number: Siemens revised these boards through the 610/210 life and drawing revisions are not always cross-compatible in a given chassis. Note the trim-pot positions on the outgoing board before removing it, and expect to re-trim offset and gain per axis with the drive enabled.

What is not included

Control PCB only. The listing title notes “no module” — there is no power module, no drive chassis or rack, no power supply or voltage-clamping module, no pulsed (braking) resistor, no motor, no tachogenerator, no ribbon or signal cables, no connector kits or terminal boards, and no documentation.

Quantity and configuration

Sold as one control board.

Interchange guidance

6RB2100-0NA21, 6RB21000NA21 and 6RB2100 0NA21 are the same board. 6RB2100-0NA01 is a different configuration within the same DC family. The similarly numbered 6SC6100-0NA21 (drawing 462 010.9070.21) is the AC Simodrive 610 analogue control board — a genuinely different part despite the near-identical tail, and the commonest mis-order on this product. Related sizes and configurations exist for one- and two-axis service; those are different boards, not equivalents.