Bosch Rexroth VAU01.1Z-Z24-024-060-NN R911170329 UPS Buffer Module

Bosch Rexroth VAU01.1Z-Z24-024-060-NN (R911170329) — 24 VDC / 60 Wh UPS Buffer Module: Stop the Clock on Downtime

Every minute a servo axis sits idle because the 24 VDC control bus lost its buffer costs real money — rejected batches, missed delivery windows, overtime labor. The VAU01.1Z-Z24-024-060-NN (Rexroth material number R911170329) is the factory-specified UPS buffer module for IndraDrive and IndraControl platforms. It holds the control bus alive during mains interruptions long enough for the drive to execute a controlled deceleration ramp, save volatile parameters to non-volatile memory, and signal the PLC for a clean shutdown sequence. Without it, an uncontrolled power loss can corrupt drive firmware, trigger axis position loss, and extend your recovery time from minutes to hours.

We stock this unit in Xiamen, China. Same-day dispatch is available for orders confirmed before 15:00 CST. DHL Express typically delivers to Europe in 3–5 business days, to North America in 4–6 days, and to Southeast Asia in 1–3 days. If your line is down right now, contact us immediately — we will prioritize your shipment.

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

Quick Technical Datasheet

Troubleshooting & Replacement Tips

Most common failure signatures for VAU01.1Z-Z24-024-060-NN:

• F8070 / F8078 (IndraDrive fault codes): “24 V supply undervoltage” or “UPS buffer fault” — these appear when the VAU module can no longer sustain output during a mains dip. First, check the DC bus capacitors on the VAU; if the module is more than 5 years old in a 24/7 environment, the internal battery cells are the primary suspect.
• E8025 warning — “UPS battery capacity low”: This is a predictive warning. The drive has detected that the buffer energy has dropped below the threshold required for a full controlled shutdown. Do not ignore it. Schedule replacement before the next planned maintenance window, not after the next unplanned stop.
• Intermittent axis position loss after power restoration: If the drive is losing its encoder reference after a mains interruption, the VAU is not holding the control bus long enough for the parameter save routine to complete. Verify the 60 Wh variant is installed — not the 30 Wh (VAU01.1Z-Z24-024-030-NN), which has half the buffer time.

Step-by-step replacement procedure:

1. Document current drive parameters: Before powering down, use IndraWorks DS or the drive’s front panel to export all axis parameters to a USB stick or engineering PC. The VAU replacement itself does not erase drive memory, but this is non-negotiable practice.
2. Isolate the 24 VDC supply rail: Switch off the 24 VDC cabinet PSU feeding the VAU input. Confirm zero voltage with a calibrated meter before touching any terminals. The internal battery can still source current — treat the module as live until the status LED is fully extinguished.
3. Disconnect in sequence: Remove the output load connector first, then the input supply connector, then the battery status signal connector (if wired). Reverse this sequence on installation to avoid transient spikes on the control bus.
4. Check DIP switch / address settings: The VAU01.1Z does not use node addressing switches — it is a passive buffer device. However, confirm the battery management signal wire (typically a 2-pin connector to the IndraDrive’s X13 or equivalent UPS monitoring port) is correctly re-terminated on the replacement unit. A missing signal connection will suppress the E8025 predictive warning on the new module.
5. Firmware note: No firmware resides in the VAU01.1Z itself. However, if your IndraDrive firmware is below MPx04 (for IndraDrive C) or MPx07 (for IndraDrive M), the UPS monitoring function may not be fully active. Verify drive firmware revision before assuming the new module is faulty.
6. Power-on verification: Restore 24 VDC supply. The VAU status LED should illuminate green within 10 seconds as the internal battery charges. If the LED flashes amber, the battery is in conditioning mode — normal for a new unit. If it remains red, check input voltage and connector seating.

Reliability in Harsh Conditions

The VAU01.1Z-Z24-024-060-NN is built to operate inside control cabinets where conditions are rarely ideal. The internal battery cells are selected for industrial-grade thermal stability — the module maintains full 60 Wh buffer capacity across the 0 °C to +45 °C operating range without derating. At +40 °C continuous ambient (a realistic figure inside a sealed cabinet in summer), the expected battery service life exceeds 5 years under normal charge-discharge cycling.

The module’s PCB assembly is conformally coated to resist humidity ingress at the IP20 boundary — relevant in coastal or high-humidity manufacturing environments where condensation can form during temperature swings between shifts. The DIN rail mounting clip is stainless steel, not zinc-plated, which matters in environments with airborne chlorides (food processing, coastal facilities).

Vibration resistance is validated to IEC 60068-2-6 (sinusoidal, 10–150 Hz, 1 g) and IEC 60068-2-27 (shock, 15 g / 11 ms half-sine). These figures are consistent with installation on machine frames subject to servo-driven vibration — the module does not require additional isolation mounts in standard IndraDrive cabinet configurations.

EMC performance is certified to EN 61800-3 Category C2, meaning the module does not introduce conducted or radiated emissions that would compromise the drive system’s CE declaration. This is particularly relevant when the VAU is installed in a cabinet that has already passed EMC type testing — a non-certified replacement could invalidate the machine’s CE marking.

Global Express Logistics

Our warehouse is located in Xiamen, Fujian Province, China — a major port city with direct access to DHL, FedEx, and UPS international express networks. Here is how a typical urgent order moves:

• Order confirmed before 15:00 CST: Unit is picked, inspected, and packed the same afternoon. Export documentation (commercial invoice, packing list, HS code 8504.40) is prepared in parallel.
• Day 1 evening: Shipment handed to DHL Express or FedEx International Priority at Xiamen pickup. Tracking number issued to buyer within 2 hours of handover.
• Transit times (typical, not guaranteed): Germany / Netherlands: 3–4 business days. USA / Canada: 4–6 business days. Australia: 3–5 business days. Southeast Asia: 1–2 business days. Middle East: 3–5 business days.
• Customs clearance: We declare all shipments at full commercial value with accurate HS codes. For EU buyers, we can provide EUR.1 movement certificates or supplier declarations for preferential origin where applicable. For US buyers, we include all data required for ACE entry.
• Packaging: The VAU module is wrapped in anti-static PE foam, sealed in a moisture-barrier bag with silica gel desiccant, and placed in a double-wall corrugated carton. The carton is labeled with fragile and orientation markings. This packaging survives the handling conditions of express air freight without additional crating.

Contact Information

📧 Email: [email protected]
📱 WhatsApp: +86 18359268345
🌐 Web: siemensplc.com
📍 Location: Xiamen, China
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