Description

The Bosch Rexroth VM350 (0608750110) is a rack-mounted central supply module engineered for the Rexroth Tightening System 350. Installed as an essential hardware component within a BT356 card rack or an SB356 system box, a single VM350 unit provides the regulated internal operating voltages required by all adjacent communication, evaluation, and servo amplifier cards. It converts a 230 V AC nominal input into system power while integrating functional safety routing, including a front-facing 24 V DC safety interface and a hardware-monitored emergency stop (E-stop) subsystem.

Technical Specifications

Commercial and Logistics Information

• Condition: New Original (Factory Sealed Surplus) or Refurbished (Fully Bench Tested)
• Warranty: 12-month standard industrial warranty
• Availability: In stock; typical processing and dispatch within 1 to 2 business days
• Logistics: Standard or expedited global air freight via DHL, FedEx, or UPS
• Pricing Policy: Indicative only. Price varies with global inventory levels and component demand; contact us for a binding commercial quote.

Architectural and Functional Insights

Central Power Distribution Matrix

The VM350 sits at the primary slot position of the modular tightening system rack. It converts incoming single-phase AC main power to supply the internal logic busses of the system components:

• KE350 / SE352 Modules: Provides the filtered DC voltages required by communication and central processing/evaluation cards.
• LT350 / LTS350D Units: Delivers basic logic rails to the servo amplifiers that drive the pneumatic or electrical tightening spindles.

X1S1 Front Interface and Safety Architecture

The X1S1 connector located on the front panel serves as the central wiring junction for local personnel safety interlocks. It functions on two levels:

1. Safety System Interlocking: It establishes the 24 V DC supply paths needed to engage or disengage the primary motor contactors within the LT350/LT350U servo amplifiers.
2. Emergency Stop Integration: The integrated safety loop fulfills Performance Level d (PL d) standards. When wired into an external safety relay circuit, pulling this line isolates the drive outputs without forcing a total system communication blackout.

External Voltage Buffering

The card design ensures that even if main line power fails or is deliberately toggled off via the primary disconnect switch, the critical tracking and data modules (KE and SE) can remain active. By routing an external, uninterruptible 24 V DC supply back through the front interface, the tightening controller preserves runtime memory, network node addresses, and torque/angle diagnostic logs.

Enclosure Subsystem Interconnection

 [ 230 V AC Mains Input ]
                                │
                 ┌──────────────┴──────────────┐
                 │    VM350 Supply Module      ├─(Front X1S1: 24 V Safety/E-Stop)
                 └──────────────┬──────────────┘
                                │
                 [ BT356 / SB356 Internal Bus ]
                    │           │           │
                    ▼           ▼           ▼
                [ KE350 ]   [ SE352 ]   [ LT350 ]
                Comms Card  Proc Card   Servo Amp 

Field Installation and Maintenance Notes

Single Module Allocation Constraint

Each BT356 card rack or SB356 system box accommodates exactly one VM350 supply module. Parallel installation of multiple VM350 units within a single backplane assembly is structurally unsupportable and will cause permanent damage to the backplane power rails due to phase synchronization issues.

Fan Module Interface Dependencies

The VM350 governs the 24 V DC supply lines routed to the ventilation fans mounted within the system box enclosures.

Important Thermal Rule: If the VM350 internal monitoring circuitry detects an absence of fan current or a failure in the auxiliary cooling loop, it will trip an internal fault flag. This flag forces the safety loop open, dropping out the servo amplifiers to prevent localized overheating of the compact amplifier modules.

Hot-Swap Restrictions

Unlike the diagnostic communication cards, the VM350 supply module cannot be hot-swapped under any circumstances. Attempting to pull or reseat the supply module while 230 V AC mains voltage is applied will result in intense electrical arcing across the high-current backplane pins. This will permanently destroy the backplane connector and corrupt memory on adjacent processing cards. Always isolate primary mains power before extracting the module.

Frequently Asked Questions

What does a complete lack of LEDs on the VM350 front panel indicate?

If all indicators are dark while the system switch is turned on:

1. Isolate power and remove the module to inspect the primary input fuses on the casing.
2. Verify that the incoming 230 V AC line is present at the input terminals of the rack base.
3. Check if an external short circuit on the 24 V DC consumer distribution line (via the X1S1 port) has forced the internal switching regulator into a continuous thermal shutdown loop.

How do I maintain PL d safety compliance when replacing this module?

When replacing a faulty VM350, ensure that the jumpers and dual-channel wiring on the X1S1 plug are transferred exactly to the replacement unit. After installation, execute a functional validation test by tripping the associated emergency stop button and verifying that the motor contactors in the LT350 amplifiers drop out within the time constraints specified in your system’s safety plan.

Are there variant versions of the 0608750110 part number?

Yes, you may find modules designated as 0608750110-101 or similar sub-index suffixes. These numbers represent internal manufacturing revisions, component optimizations, or regional manufacturing codes. The core dimensions, pinouts, and operational specifications remain fully backward-compatible across the entire VM350 hardware lineup; verify with the OEM datasheet if an exact series match is mandated by your facility’s validated configuration documentation.