Bosch Rexroth MS2N04-B0BNN-CSSG1-NNNNN-NN Servo Motor

MS2N04-B0BNN-CSSG1-NNNNN-NN: Stop the Bleeding — Get Your Line Back in 48 Hours

Your CNC axis just faulted. The IndraDrive is throwing F8022 or F8025. The encoder signal is gone, the spindle won’t home, and your shift supervisor is already on the phone. You don’t need a catalog — you need a motor on a plane tonight. The Bosch Rexroth MS2N04-B0BNN-CSSG1-NNNNN-NN is on our shelf in Xiamen. We’ve shipped this exact part to machine shops in Germany, automotive plants in Thailand, and packaging lines in Mexico — all on emergency timelines. This page exists for one reason: to get you back to production as fast as physically possible.

URGENT REQUIREMENT? Contact: [email protected] | WhatsApp: +86 18359268345

Quick Technical Datasheet

Troubleshooting & Replacement Tips

Ten years of field calls on Rexroth servo systems teach you the same lessons over and over. Here’s what actually matters when you’re swapping an MS2N04 under pressure:

Fault Codes That Point Directly to This Motor:

• F8022 — Encoder signal loss: Nine times out of ten this is a failed CSSG1 encoder, not a cable fault. Swap the motor before chasing wiring.
• F8025 — Motor temperature sensor open circuit: The KTY84 thermistor inside the MS2N04 winding fails after sustained overload cycles. If your drive logs show repeated thermal warnings before the hard fault, the sensor is gone — replace the motor.
• F2028 — Commutation error on startup: Occurs when the absolute encoder loses its reference after a power surge. Attempt a C0700 encoder reset via IndraWorks first. If the fault persists after two attempts, the encoder ASIC is damaged — motor replacement is the only fix.
• E8025 / E8026 — Encoder battery warning (if applicable): Not relevant for CSSG1 single-turn absolute, but worth confirming your encoder variant before ordering a replacement.

Replacement Procedure — Field Checklist:

• Before disconnecting: record the current P-0-0051 (motor type) and P-0-0080 (encoder type) parameters from IndraWorks. The new motor must match exactly — do not assume the replacement is pre-loaded with the correct motor data record (MDR).
• Power down the IndraDrive and wait a minimum of 5 minutes for DC bus capacitors to discharge below 50V. Verify with a meter — do not rely on the drive’s power-off indicator alone.
• Disconnect the RKL motor power cable (M23 connector) and the RKG encoder cable (M17 or M23 depending on your cable set). Label both before removal.
• The MS2N04 uses a standard IEC flange. Torque the mounting bolts to 8 Nm in a cross pattern — uneven torque causes shaft misalignment that will destroy the new motor’s bearings within weeks.
• After mechanical installation, connect encoder cable first, then power cable. Power up the drive and execute a C0700 encoder initialization. The drive must complete this before the first enable command — skipping it causes F2028 on first motion.
• Run a slow jog (5% speed) in both directions before returning to automatic mode. Listen for any irregular noise from the new motor — a grinding or clicking sound at low speed indicates a bearing issue or shaft misalignment.
• Log the replacement date, serial number of the new motor, and the fault history in your maintenance system. Rexroth MS2N04 units in continuous duty typically show encoder degradation after 40,000–60,000 operating hours.

Configuration Notes:

• The MS2N04-B0BNN-CSSG1-NNNNN-NN has no DIP switches or address selectors — all configuration is handled via the IndraDrive parameter set. Ensure your MDR (Motor Data Record) file matches the exact part number including the full option string.
• If replacing an older MSK040 with this MS2N04, verify the motor cable pinout — the M23 connector is physically compatible but the pin assignment for the brake circuit differs on some cable revisions.
• Firmware: IndraDrive firmware MPH-02 V28 or later is required for full MS2N encoder support. Earlier firmware versions may not recognize the CSSG1 encoder type and will fault on C0700.

Reliability in Harsh Conditions

The MS2N04-B0BNN-CSSG1-NNNNN-NN is not a lab instrument — it’s built for the floor. The IP65 housing with shaft seal keeps coolant emulsion, aluminum swarf, and hydraulic mist out of the winding cavity. We’ve seen these motors run continuously in Swiss turning centers where the coolant flood never stops and the ambient temperature swings 30°C between morning startup and afternoon peak production. The stator winding uses Class F insulation rated to 155°C continuous — the motor will outlast the thermal protection trip point of the IndraDrive before the winding itself fails.

Vibration resistance is validated to IEC 60068-2-6 (sinusoidal) and IEC 60068-2-64 (random broadband). In practice, this means the MS2N04 survives being mounted on a press brake or a heavy-duty milling center where the entire machine frame resonates during cutting. The rotor is dynamically balanced to G2.5 — you will not see vibration-induced encoder errors that plague cheaper servo alternatives.

Humidity and condensation are handled by the sealed housing and the conformal coating on the encoder PCB. Cold-start in an unheated factory at -10°C is within spec. The motor does not require a warm-up cycle before full-load operation — critical when you’re restarting a line after an emergency shutdown in winter.

Global Express Logistics

Our warehouse is in Xiamen, Fujian — one of China’s primary export hubs with direct access to Xiamen Gaoqi International Airport and daily DHL and FedEx pickup schedules. Here’s how a typical emergency shipment moves:

• Order confirmed before 14:00 CST: Same-day packaging and handover to DHL Express or FedEx International Priority.
• Transit to Europe (Germany, Poland, Czech Republic): 2–3 business days door-to-door via DHL Express Worldwide.
• Transit to Southeast Asia (Thailand, Vietnam, Malaysia): 1–2 business days via FedEx International Priority.
• Transit to Middle East (UAE, Saudi Arabia, Turkey): 2–3 business days via DHL Express.
• Transit to Americas (USA, Mexico, Brazil): 3–5 business days via FedEx International Priority.

Every shipment includes a commercial invoice with correct HS code (8501.52 — AC servo motors), packing list, and certificate of origin. For EU customers, we provide EUR.1 movement certificates on request to support preferential duty treatment. The motor is packed in anti-static foam inside a double-wall carton with corner protectors — it arrives in the same condition it left our shelf.

Tracking numbers are sent via email and WhatsApp within 2 hours of carrier pickup. If your customs broker needs pre-clearance documentation, we can provide the full package 24 hours before departure.

Contact Information

Production lines don’t wait. Reach us directly:

• 📧 Email: [email protected]
• 💬 WhatsApp: +86 18359268345
• 🌐 Web: siemensplc.com

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