Siemens 6RA7087-6FV62-0 SIMOREG DC-MASTER DC Drive Unit

Module Feature

6RA7087-6FV62-0 belongs to Siemens SIMOREG DC-MASTER 6RA70 series fully digital DC converter. It adopts microprocessor-based digital control architecture, supports four-quadrant regenerative operation, capable of forward/reverse rotation and electric/braking working modes. This model integrates armature power section and field rectifier, supports encoder or tachometer feedback for high precision closed-loop speed regulation. It has built-in I/O terminals and expansion slots for Profibus, SIMOLINK and other communication boards. It features rich protection functions and flexible parameter configuration, widely used for metal rolling machines, winding/unwinding machines, extruders, paper machines and heavy-duty DC motor drives.

Working principle

Three-phase AC power is rectified by thyristor bridge into adjustable DC voltage for DC motor armature. Separate field rectifier supplies excitation current to motor field winding. Speed and current feedback signals are collected by control board to form double closed-loop regulation. In regenerative braking mode, energy is fed back to AC grid. The drive continuously monitors voltage, current, temperature and pulse signals, and triggers protective shutdown once fault occurs. Parameters and fault logs can be accessed via DriveMonitor software.

Onboard components

Thyristor power bridge, field rectifier unit, digital control motherboard, pulse trigger board, current and voltage sampling sensors, cooling fan, I/O terminal block, communication option slot, operating display panel.

LED indicators

Front panel LEDs indicate power supply, ready status, running, fault alarm and communication activity.

Hardware self‑diagnosis

Automatic self-test after power-on. Detects phase loss, overcurrent, overvoltage, undervoltage, overtemperature, pulse loss, field loss, speed feedback signal loss and communication timeout, and stores fault codes.

Programming software

DriveMonitor, used for parameter setting, motor identification, ramp configuration, fault diagnosis and firmware download.

Electrical & Process Parameters

Model:6RA7087-6FV62-0 Brand:Siemens Device type:4-Quadrant Digital DC Converter Input:3AC 400V Armature output:420V DC Control:Closed-loop speed, current and torque regulation Function:DC motor variable speed control with regenerative braking

Mechanical & Structure

Mounting:Cabinet vertical installation Protection class:IP00 Housing:Metal chassis with forced air cooling

Environmental

Operating temperature:0℃ ~ +45℃ (derate above 40℃) Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing Certification:CE, UL compliant Status:Discontinued Siemens original DC drive spare

Installation

Install vertically inside control cabinet and reserve sufficient ventilation clearance. Separate power cables, armature cables and shielded feedback cables. Complete motor commissioning, speed feedback matching and current loop optimization before formal operation. Clean heat sink and fan regularly.

Interface

Three-phase AC input terminals, DC armature output terminals, field winding output terminals, tachometer/encoder feedback port, digital/analog I/O terminals, communication slot.

Diagnostic

Overcurrent: Motor short circuit, armature earth fault, mechanical jam, current loop gain too high. Field loss alarm: Field fuse blown, field cable broken. Speed feedback fault: Tachometer or encoder cable damaged, signal channel mismatch. No regenerative function: Power supply phase sequence error, thyristor module damaged.

Product BriefSiemens 6RA7087-6FV62-0 SIMOREG DC-MASTER four-quadrant DC converter, 400V input, integrated field supply, for rolling mill, winder and heavy DC motor variable speed control.