Español (España) 
Deutsch (Deutschland) 
Français 
Italiano 
Siemens MICROMASTER – Optional accessories and modules (power supplies, interfaces and platform spare parts)
In MICROMASTER systems, machine downtime is not caused only by the power inverter: very often the plant stoppage originates from the electronic support modules.
In many cases the drive is powered and apparently working, but the machine does not start because a peripheral device does not allow start-up or communication with the control system.
Why MICROMASTER accessories are critical today
After decades of continuous operation, auxiliary components are statistically more prone to failure than the power stage.
Their malfunction can cause:
inverter powered but motor stopped
PLC communication loss
machine lock without clear alarms
reset impossible
loss of operating parameters
For this reason they are often the cause of so-called unexplained plant stoppages in legacy systems.
What MICROMASTER accessories and optional modules are
They are electronic units that allow the inverter to operate correctly inside the machine.
They do not directly generate motor motion but manage:
logic power supplies
field communication
operator interface
machine signal management
Without these modules the drive cannot be controlled by the automation system.
Product roots – MICROMASTER accessories and modules
👉 6SE3090 – power supply units and inverter support sections
👉 6SE3190 – electronic control and interface modules
👉 6SE3290 – power modules and platform structural components
These components do not directly drive the motor but allow the inverter to operate correctly and communicate with the machine.
Main components present in machines
Operator panels • communication modules • I/O boards • logic power supplies • internal electronic sections
Typical applications
They are present in virtually all MICROMASTER-based automatic machines:
packaging lines
conveyors
process machines
handling systems
industrial automatic plants
Most frequent failures
With electronic aging, the following are often observed:
non-communicating keypad
fieldbus error
start enable missing
line stop without fault
start possible only locally
Repair or replace the module?
Replacement with modern components often requires software and wiring modifications.
Repair instead allows to:
quickly restore operation
maintain original configurations
avoid PLC modifications
drastically reduce downtime
E-Repair services for MICROMASTER accessories
E-Repair, the only authorized Siemens Service Partner in Europe, provides full support:
🔧 Repair in an internal Siemens-certified laboratory
♻️ Full “zero-hours” standard regeneration
⚡ Advance regenerated module for production emergencies
💾 Parameter backup and restore
🧼 Professional technological cleaning
🩺 Fault diagnostics and preventive maintenance
🔐 Functional and safety testing
Processes compliant with:
BS 8001:2017
AFNOR XP X30-901:2018
ISO 14064-1
Conclusions
In legacy industrial plants, MICROMASTER optional modules often represent the real point of production process stoppage.
Structured maintenance helps prevent unexpected machine downtime and maintain operational continuity without invasive interventions.
🟢 Pillar Page Article – MICROMASTER optional accessories 6SE3090, 6SE3190 and 6SE3290
