Original Siemens Pmu Board 6SE7090-0XX84-2FA0 6SE70900XX842FA0 6SE7O9O-OXX84-2FAO 6SE7 090-0XX84-2FA0

6SE7090-0XX84-2FA0 | Siemens SIMOVERT MASTERDRIVES PMU Operator Panel — Parameter Assignment Unit / Designs A and B / Local Interface

PMU — The Drive's Local Face

The 6SE7090-0XX84-2FA0 is the PMU (Parameterization Unit) — the operator panel that provides the local human-machine interface for SIMOVERT MASTERDRIVES systems. Without the PMU, the drive can still run from fieldbus control, but local parameter access, fault reading, and manual speed adjustment are unavailable.

The PMU's role is entirely about accessibility: it brings the drive's full parameter set to the fingertips of a field technician standing at the cabinet door, without requiring a laptop, software licence, or network connection.

Key Specifications

Design A and B — Compact MASTERDRIVES Units

The "FOR DESIGNS A AND B" specification identifies the compact MASTERDRIVES enclosure classes that use the 6SE7090-0XX84-2FA0 PMU:

Design A: The smallest MASTERDRIVES compact unit — covering the lower power ratings of the MASTERDRIVES range in a compact, space-saving enclosure format.

Design B: The next compact enclosure size — slightly larger than Design A, covering higher power compact drive applications.

Both Design A and B units are the compact MASTERDRIVES form factors — smaller and more cabinet-space-efficient than the larger Design E, F, G, and H chassis units. The 6SE7090-0XX84-2FA0 PMU is designed for these compact units and mounts directly on the front of the drive's electronic box.

Application Scenarios

PMU fault or display failure: A MASTERDRIVES Design A or B drive loses its local display — the PMU shows a blank display or erratic readings, preventing local parameter access. The 6SE7090-0XX84-2FA0 is replaced. Full local operator interface is restored.

Commissioning a new Design B drive: A new MASTERDRIVES compact drive is installed. The 6SE7090-0XX84-2FA0 PMU is fitted to the electronic box front — enabling on-site parameter entry during commissioning without a PC or PROFIBUS connection.

FAQ

Q1: Is the PMU necessary for the drive to operate in production?

No. The PMU is the local operator interface — it is not required for the drive to run from a fieldbus command source (PROFIBUS, CANopen, or similar). If the drive receives its enable and setpoint from a fieldbus-connected PLC or control system, it operates normally without the PMU fitted. The PMU becomes essential for local parameter access, fault reading, and manual commissioning operations when the fieldbus is not available or when local adjustments are needed.

Q2: Does the 6SE7090-0XX84-2FA0 work with both Vector Control and Motion Control MASTERDRIVES?

Yes. The PMU is compatible with both SIMOVERT MASTERDRIVES Vector Control (VC) and Motion Control (MC) variants in Design A and B. The parameter numbering and PMU navigation differ between VC and MC — VC has a simpler parameter set while MC includes position control and motion parameters — but the same physical PMU hardware accesses both. The PMU's display and keypad interface presents the parameter numbers defined by whichever CU variant is installed.

Q3: How is the 6SE7090-0XX84-2FA0 mounted on the drive?

The PMU mounts directly on the front face of the MASTERDRIVES compact unit's electronic box (control section) — it plugs into a defined connector on the electronic box front panel and is typically secured by a locking catch or retaining clip. The PMU draws power from the drive's internal electronics supply through its mounting connector — no separate power supply connection is needed.

Q4: Can the 6SE7090-0XX84-2FA0 PMU be shared between multiple drives for commissioning?

Yes. The PMU is a removable plug-in unit — it can be removed from one drive and inserted into another for parameter entry or fault reading, then returned to its original drive. This means one PMU can serve multiple drives in a maintenance situation. When removed, the drive continues to run normally from its fieldbus setpoint. When replaced, the PMU resumes displaying the current drive parameters.

Q5: Are parameters lost when the 6SE7090-0XX84-2FA0 PMU is removed or replaced?

No. Drive parameters are stored in the drive's control unit electronics — not in the PMU. Removing or replacing the PMU does not affect the drive's stored parameter set. The replacement PMU immediately displays the current drive parameters when connected — no re-entry of parameters is required.