Siemens Vdu Board 6SE7038-6GL84-1JB0 6SE70386GL841JB0 6SE7O38-6GL84-1JBO 6SE7 038-6GL84-1JB0

Siemens 6SE7038-6GL84-1JB0 | SIMOVERT MASTERDRIVES Voltage Divider Module VDU — Spare Part

Part Number: 6SE7038-6GL84-1JB0

Internal A5E Reference: A5E00278137

Manufacturer: Siemens AG (Germany)

Overview

The 6SE7038-6GL84-1JB0 is the Voltage Divider Module (VDU) — a spare part for Siemens SIMOVERT MASTERDRIVES chassis drives in the large GL-frame power range. The 6SE7038-6GL84 electronics series houses multiple functional modules for this high-power drive variant; the VDU is one of these internal assemblies.

The VDU's core function is DC bus voltage measurement and signal conditioning. In large SIMOVERT MASTERDRIVES chassis units, the DC link voltage cannot be measured directly by the control electronics at low signal levels. The VDU divides the high DC bus voltage to a safe, measurable signal and delivers this scaled voltage feedback to the drive's control board. Accurate DC bus voltage feedback is essential for the drive's voltage regulation, pre-charge sequencing, and overvoltage protection functions.

Within the GL84 electronics assembly family, the 1JB0 suffix identifies the VDU specifically. Adjacent part numbers in the same 6SE7038-6GL84 series address other functions: 1JA1 is the PSU2 power supply board, 1BG0 and 1BG2 are IVI inverter interface boards. All are spare parts for the same large SIMOVERT MASTERDRIVES chassis configuration.

Key Specifications

FAQ

Q1: The SIMOVERT shows DC bus voltage fault or pre-charge failure. Could the VDU be the cause?

Yes. If the VDU's voltage divider circuit has failed, the control board receives an incorrect or absent DC bus voltage measurement. A drifted or failed VDU causes the drive to misread the actual DC bus level — triggering overvoltage protection, incorrect pre-charge sequencing, or a bus undervoltage fault even with the correct DC voltage physically present.

Q2: The 6SE7038-6GL84-1JB0 is discontinued since 2011. Is it still available?

The industrial aftermarket — specialist SIMOVERT MASTERDRIVES spare parts dealers — is the primary source. Confirm the A5E reference A5E00278137 on the supplied unit to verify it is the correct assembly. Request a functional test certification before purchase.

Q3: What other boards are in the 6SE7038-6GL84 electronics assembly?

The GL84 family includes: 1JA1 (PSU2 power supply board), 1BG0 and 1BG2 (IVI inverter interface boards), and the 1JB0 VDU (this product). These boards serve the same large SIMOVERT MASTERDRIVES chassis configuration and are related but not interchangeable.

Q4: The successor is listed as LV SINAMICS. What does migrating from SIMOVERT to SINAMICS require?

Migration to SINAMICS G130, G150, or S120 requires a complete drive replacement — the SIMOVERT chassis, control electronics, and power section are all replaced. The motor and related field wiring can typically be retained. Full recommissioning with SINAMICS parameters and commissioning tools is required.

Q5: Does replacing the VDU require any parameter adjustment on the SIMOVERT drive?

The VDU is a passive signal-conditioning component — it does not hold drive parameters. After a like-for-like VDU replacement, the drive's voltage measurement should resume normal operation without parameter changes. Verify the DC bus voltage reading on the drive display matches an external meter measurement to confirm the replacement VDU is functioning correctly.