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| Place of Origin | Germany |
| Brand Name | SIEMENS |
| Certification | CE ROHS |
| Model Number | 6SE7036-1EE85-1HA0 C98043-A1682-L1 |
Part Number: 6SE7036-1EE85-1HA0
Manufacturer: Siemens AG (Germany)
Product Type: Control Unit PER2 (Spare Part — Electronics Board)
Compatible Units: SIMOVERT Master Drives Infeed/Regenerative Feedback Units, Design E
Supply Voltage: 380–480 V 3 AC, 50/60 Hz
Current Class: 605 A (Design E Frame)
The 6SE7036-1EE85-1HA0 is the PER2 control unit — the electronics control board — for Siemens SIMOVERT Master Drives infeed and regenerative feedback units of Design E at 380–480 V. It is a spare part for the power unit, not a complete drive.
The -1HA0 suffix identifies this as the replaceable control electronics assembly within the larger 6SE7036-1EE85 series power unit. When the control circuitry of a Design E infeed/regenerative unit fails while the power stage remains intact, this board is the field-replacement solution.
The parent unit — the SIMOVERT infeed/regenerative module — serves a specific function in multi-drive systems. Rather than each inverter drawing independently from the AC supply, a shared DC bus architecture connects them.
The infeed unit is the interface between the three-phase AC supply and the DC bus. It rectifies incoming AC into a controlled DC voltage and, crucially, also allows regenerated energy from decelerating drives to flow back to the AC supply.
This active energy return is the "regenerative" function in the name.
The PER2 control unit is the intelligence that makes this bidirectional energy flow work. It monitors the DC bus voltage, regulates the PWM pattern of the active rectifier's switching devices, manages precharge sequences, communicates status to the system, and handles fault detection.
Without a functioning PER2, the infeed unit defaults to a passive state and the DC bus loses its regulated voltage.
| Parameter | Value |
|---|---|
| Part Number | 6SE7036-1EE85-1HA0 |
| Manufacturer | Siemens AG |
| Product Type | Control Unit PER2 (Spare Electronics Board) |
| Compatible Power Unit | 6SE7036-1EE85 series (Design E) |
| Supply Voltage | 380 – 480 V 3 AC |
| Frequency | 50 / 60 Hz |
| Current Rating (Power Unit) | 605 A |
| Frame Size | Design E |
| Drive Family | SIMOVERT Master Drives |
| Country of Origin | Germany |
| Condition Available | New / Refurbished / Repaired |
Standard diode rectifiers convert AC to DC in one direction only. Energy from braking motors has nowhere to go except into resistors, where it becomes heat. Active infeed units with regenerative capability are fundamentally different.
They use insulated gate bipolar transistors (IGBTs) in place of diodes, controlled by high-frequency switching patterns that can push current in either direction through the AC line connection.
When drives on the DC bus are motoring — accelerating loads — the active infeed draws power from the AC supply and maintains the DC bus voltage. When drives are regenerating — decelerating loads, where motor kinetic energy becomes electrical energy — the infeed unit senses the rising DC bus voltage and reverses the power flow.
It switches the IGBTs to push current back into the AC supply at the correct frequency, phase, and amplitude. The grid absorbs this energy as if it were delivered by any other source.
The PER2 control unit implements this logic.
It measures the DC bus voltage, monitors the AC line voltage and phase, computes the required switching pattern, and drives the IGBT gate signals.
Phase-locked loop circuits synchronise the regenerated current with the AC grid to ensure unity power factor feedback and compliant power quality.
Siemens designates frame sizes alphabetically for SIMOVERT Master Drives units. Design E corresponds to the higher-power bracket — the 6SE7036-1EE85 base unit at 380–480 V, 605 A operates in the range of approximately 400–500 kW.
This is substantial industrial power, serving large fans, pumps, compressors, test stands, rolling mills, and similar high-power loads where energy recovery from regenerative braking produces measurable cost savings.
The electronics box on Design E units houses the PER2 control board. This separates the control circuitry from the high-power electronics.
When only the control electronics fail, the power stage — transformer, bus capacitors, IGBTs, cooling — can be retained.
Replacing only the PER2 board is significantly less costly than replacing the complete power unit.
The PER2 control unit contains the microprocessor, communication interfaces, measurement circuits, and gate driver logic for the infeed unit.
These components are subject to different failure modes than the power semiconductors. Microprocessor faults, gate driver IC failures, degraded measurement circuits, and communication interface damage all manifest as control faults rather than power faults.
The power stage tests as healthy but the unit cannot regulate.
Fault codes on the unit's display panel guide the diagnosis. Faults pointing to regulation failure, DC bus voltage deviation, or internal communication errors — with power stage components testing intact — direct the fault to the control board.
Faults indicating overcurrent or gate drive short circuits may point to the power stage instead.
Q1: The infeed unit faults immediately on power-up with a "regulation error." The DC bus voltage is correct at precharge. Is the PER2 the fault?
Immediate regulation failure after successful precharge — when the power stage appears functional — is characteristic of a PER2 fault.
The precharge circuit is separate from the main regulation; the unit charges the DC bus passively but then fails when it attempts to activate active regulation.
Replace the PER2 board and clear the fault history before re-attempting start.
Q2: Can the PER2 parameters be backed up before the board is replaced?
Parameter data on SIMOVERT Master Drives units can typically be transferred to a PC or operator panel via the serial interface or uploaded using the drive's parameterisation software.
Perform this backup before replacing the board if the current parameterisation represents a tuned or customised setup.
A factory-replacement PER2 installs with default parameters that may not match the installation's requirements.
Q3: The infeed unit was hit by a mains voltage transient. The power stage IGBTs tested good but the unit will not start. Is the PER2 board susceptible to transient damage?
Yes. The measurement circuits and communication interfaces on the PER2 board contain semiconductor components sensitive to overvoltage.
A significant mains transient can damage these while leaving the higher-rated power semiconductors intact.
This is a known failure mode after supply-side electrical events.
Inspect the PER2 board for visible component damage before concluding it requires replacement.
Q4: Is the 6SE7036-1EE85-1HA0 compatible with infeed units from different voltage classes (e.g., 500 V class)?
No. The PER2 board is specific to the voltage class of the power unit.
The 380–480 V class board contains voltage-specific measurement circuit scaling and parameter default settings.
Installing a 400 V class PER2 in a 500 V class unit will produce measurement errors and incorrect regulation.
Always match the board to the exact power unit part number.
Q5: How should a removed PER2 board be stored as a spare?
Store in original or equivalent anti-static packaging at stable room temperature away from moisture.
The board contains no battery-backed memory for critical application data — any application-specific parameterisation should be saved to an external medium before removal.
Visually inspect connector contacts for oxidation before reinstallation after extended storage.
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