Siemens 6SE7036-5GK84-1JC2 IGD8 Inverter Gate Driver Board

The Siemens 6SE7036-5GK84-1JC2 (IGD8) is a gate driver board for SIMOVERT MASTERDRIVES AC drive systems. This module provides the gate drive signals for the IGBTs (Insulated Gate Bipolar Transistors) in the inverter section of the drive. It converts low‑voltage PWM signals from the control board into high‑current, optically isolated pulses to switch the IGBTs on and off. The IGD8 includes fault detection circuits (desaturation, short‑circuit, overcurrent) and status feedback to the control board. It is a critical component for maintaining or repairing MASTERDRIVES units in industrial motor control applications. The board is housed in a protective plastic frame and connects directly to the power stack.

Technical Specifications

Board type: 3‑phase IGBT gate driver for SIMOVERT MASTERDRIVES. Supply voltage: 24 V DC from the control electronics. Output gate drive voltage: typically ±15 V to IGBT gates. Isolation: optical or transformer between control and power side. Fault detection: desaturation (VCE saturation), short‑circuit, undervoltage lockout. Control interface: ribbon cable to the main control board (e.g., CUVC). Dimensions: approx. 150 mm × 100 mm × 30 mm. Weight: 0.3 kg. Operating temperature: 0°C to 50°C. Storage: -25°C to 70°C. The board includes test points for gate signals and fault status LEDs. Compatible with MASTERDRIVES chassis sizes (likely for frame sizes E–F).

Key Features

• Gate driver for 3-phase IGBT power module in MASTERDRIVES

• Optically isolated gate drive for high noise immunity

• Integrated desaturation detection for short‑circuit protection

• Fault signal output to control board for IGBT overcurrent

• 24 V DC logic power

• Status LEDs for power and fault per phase

• Replacement part for Siemens 6SE7036 series inverters

• Connects directly to power stack through compression pins or cables

Function in MASTERDRIVES System

The IGD8 board receives PWM timing signals from the CUVC (Control Unit) or CUPM control board. It amplifies these low‑level signals to the required gate voltage (±15 V) and current (up to several amperes peak) to drive the IGBTs. The board also monitors the IGBT collector‑emitter voltage during the on‑state to detect desaturation (a condition indicating a short‑circuit or overload). Upon detecting a fault, the IGD8 immediately shuts down the gate drive and sends a fault signal back to the control board, which then triggers a safe stop. This protection is crucial for preventing catastrophic failure of the IGBTs.

Applications

This board is used in Siemens SIMOVERT MASTERDRIVES AC drives of certain frame sizes, specifically where the power rating is in the range of 37 kW to 75 kW (depending on voltage). It is commonly found in industrial applications such as conveyor systems, pumps, fans, extruders, and winches. The board is a service part for repairing drives that have suffered IGBT failure or gate driver faults.

Installation and Replacement

Disconnect the drive from all power sources and wait for the DC link capacitors to discharge. Remove the cover of the MASTERDRIVES unit. Locate the existing IGD8 board attached to the power stack. Disconnect the control ribbon cable and any wiring. Remove mounting screws and carefully lift the board. Clean the power stack contacts (if using compression pins). Install the new IGD8, ensuring all pins align and make good contact. Reconnect the ribbon cable and secure the board. Reassemble the drive. After power‑up, verify that no fault LEDs are lit and that the drive can run a motor at low speed. Calibration is not required; the board is plug‑and‑play.

Maintenance and Troubleshooting

The IGD8 board has three red LEDs (one per phase) and a green power LED. During normal operation, the green LED is on. If a phase’s red LED lights, that IGBT is in fault condition (desat). Causes: IGBT short‑circuit, motor winding short, or incorrect gate driver operation. The board has no field‑serviceable parts; replace the entire unit if faulty. Keep the board free from dust and moisture.

Conclusion

The Siemens 6SE7036-5GK84-1JC2 IGD8 inverter gate driver board is an essential replacement component for SIMOVERT MASTERDRIVES AC drives. It ensures reliable switching and protection of IGBTs, extending the life of the drive system.