Product Model: P3798102-00000
Brand: Bosch Rexroth
Product Type: Internal Power Supply / Capacitor Module for a Servo Drive
Compatibility: Designed for specific Indramat HMD/HMV or MAC series servo drives.
Function: This module is part of the internal DC bus circuit. It typically functions as a Bus Capacitor Module or Intermediate Circuit Capacitor Bank. Its primary roles are to stabilize the DC bus voltage, filter rectified AC input, and supply energy for drive regenerations.
Critical Specifications: Contains high-capacitance, high-voltage electrolytic capacitors. Voltage rating is typically ~600-800 VDC to suit a 400-480VAC input system. Capacitance values are in the range of thousands of microfarads (µF).
Product Overview
The P3798102-00000 is a critical internal component within a larger Bosch Rexroth Indramat servo drive system. It is not a standalone drive or controller, but a specialized capacitor module essential for the stable and reliable operation of the drive's power electronics. This module smooths the rectified DC voltage, provides a low-impedance energy source for the inverter transistors during high-current demands, and helps handle regenerative energy from the motor during deceleration. Failure of this module often results in DC bus under-voltage faults, unstable operation, or complete drive failure, making it a key spare part for maintenance and repair of legacy Indramat systems.
Key Features & Benefits
Ensures DC Bus Stability: Smoothes the rectified voltage, reducing ripple and providing a stable DC source for the inverter stage, which is crucial for generating clean AC waveforms to the servo motor and ensuring smooth torque production.
Supplies Peak Current Capacity: The capacitors can deliver very high instantaneous currents required by the motor during rapid acceleration or load impacts, which the front-end rectifier alone cannot supply, thus protecting the drive's power semiconductors.
Handles Regenerative Energy: Absorbs and stores short bursts of energy fed back from the motor during braking, helping to prevent the DC bus voltage from rising to dangerous levels until it can be dissipated or used.
Critical for System Longevity: A healthy capacitor module reduces stress on other drive components. Replacing aged capacitors (which dry out and lose capacitance over time) is a common preventative maintenance task to restore drive performance and prevent catastrophic failures.
Enables Repair vs. Replacement: Availability of this internal module allows for the cost-effective repair of expensive, otherwise obsolete servo drives, extending the service life of valuable capital equipment in automation lines.
Core Adaptation Scenarios
Scenario 1: Intermittent "DC Bus Undervoltage" Fault on a Production Machine
A CNC machining center or packaging line with an Indramat servo drive begins to throw intermittent "DC Bus Undervoltage" (F802 or similar) alarms, especially during axis acceleration or under heavy load. The problem worsens over time, leading to production stoppages.
Adaptation Solution: The P3798102-00000 capacitor module is the most likely cause. Its electrolytic capacitors have degraded with age and heat, losing their ability to hold sufficient charge. Replacing this module restores the DC bus's energy buffer capacity, eliminating the undervoltage faults and allowing the machine to handle peak power demands again. This repair is a standard procedure to revive aging Indramat drives, often restoring years of additional service.
Scenario 2: Proactive Maintenance for High-Availability Equipment
A manufacturer operates a 24/7 production line with several critical Indramat servo drives that have been in continuous operation for 8-10 years. To avoid an unexpected, costly line stoppage, a preventative maintenance (PM) plan is implemented.
Adaptation Solution: As part of the PM schedule, the P3798102-00000 capacitor modules in the key drives are proactively replaced. This is done during a planned maintenance shutdown. Swapping out these aging components before they fail prevents the associated drive faults and potential damage to the inverter stage, ensuring maximum line uptime and reliability. This strategy is common in automotive, printing, and converting industries.
Service Guarantee and Support
Warranty Service: This critical internal component is supplied with a 12-month warranty. We guarantee it to be free from manufacturing defects and to provide the rated capacitance and voltage performance.
Technical Support: We provide expert support for identifying the correct capacitor module for your specific Indramat drive model (e.g., HMD01.1N-W0075, MAC071C). We strongly advise verifying the compatibility by cross-referencing the drive's own part list or physical inspection.
⚠️ Important Safety Notice: These modules store lethal high voltage even when power is disconnected. Replacement must only be performed by qualified personnel following proper lock-out/t
