ETEL Accuret MODULAR 300/400/600 Controller Selection Guide

It is worth noting that the "maximum continuous power" of the 600 series controller is labeled as 7.3 kW (three-phase input), while the 400 series is not explicitly stated, but can be calculated based on voltage and current. The 600 series is suitable for long-distance driving scenarios that require high voltage to reduce cable losses, or heavy-duty applications that require high power output.

Specification and selection of power module

The power module provides a rectified DC bus for the controller and also serves as an auxiliary power supply (24 VDC) output for external sensors or circuit breakers.

300/400 series power supply (EA-S0M-300-40/80A and EA-S0M-400-40/80A)

Both have similar external dimensions (130 × 182 × 75 mm) and provide a continuous current capacity of 40 Arms per axis, with an overload peak of 80 Arms (short pulse). The difference is that the 300 series power supply has a single-phase input of 71~240 VAC, a maximum AC current of 15 A (@ 240 VAC), and a continuous power of about 2.4 kW; while the 400 series power supply supports single-phase or three-phase 100~400 VAC, with a maximum AC current of 10 A (but the continuous power is limited by the input current and is actually 2.8 kW single-phase or 4.8 kW three-phase). The auxiliary outputs of both are 24 V ± 10%/10 A, and the auxiliary inputs are also the same (24 V/10 A, used for external emergency power supply).

The power module integrates soft start and surge limiting circuits internally, with a maximum surge current of 15 A (under 280 VAC conditions), effectively reducing power on shock. Simultaneously providing overcurrent, overvoltage, and undervoltage protection, and indicating the operating status through status LEDs.

600 series power supply (EA-SOM-600-40/80A)

The model name of the power supply includes "SOM" instead of "S0M", indicating that its internal topology is optimized for high voltage. The input only supports three-phase 142-424 VAC, maximum AC current of 10 A, surge peak of 15 A @ 424 VAC, and maximum continuous power of 7.3 kW. The DC output bus is 200-600 V, with a continuous current of 10 Arms (limited by the input current), but the pulse current can reach 80 A. The auxiliary output is also 24 V ± 10%/10 A. Due to the high voltage level, the power supply adopts thicker insulation and larger safety spacing, and the size is correspondingly increased (250 × 246 × 50 mm, but the height may be higher).

When selecting, it should be noted that the rated current of the power supply (40/80A) refers to the bus current capacity that can be provided to the controller, but the actual output is still limited by the AC input capacity. For example, the 400 series power supply can reach 4.8 kW for three-phase input, but if it is single-phase input, it will be reduced to 2.8 kW. It is necessary to choose according to the on-site power supply conditions.

Control performance and core parameters

All Accuret MODULAR controllers share the same real-time control architecture, with the following key sampling times:

Current loop sampling: 50 µ s (i.e. 20 kHz update rate), capable of achieving extremely high current response bandwidth, suitable for low inductance linear motors.

Position loop sampling: 50 µ s (synchronized with the current loop) to ensure the speed of the position loop.

Motion planning and command management: 400 µ s (can be reduced to 200 µ s through configuration), responsible for trajectory generation, interpolation, and command buffering.

The basic motion curves include trapezoidal, S-shaped, sine shaped, and any curve in the form of a lookup table. More complex interpolation motions (such as CNC tool paths) require coordination with the upper level UltimET motion controller and transmission through the TransnET real-time bus. The controller is equipped with a built-in trajectory filter, which can suppress mechanical resonance and support force control mode (with or without external force sensors), achieving constant force contact with zero dwell time, significantly improving the processing quality of grinding, polishing and other processes.

Advanced features and intelligent algorithms

The core difference between this series and ordinary servo drives lies in its embedded intelligent algorithm suite:

Dual encoder feedback management: supports simultaneous connection of motor side encoder and load side linear encoder, eliminating positioning deviation caused by mechanical transmission clearance or thermal expansion through internal position error compensation. This function is crucial for ultra-high precision applications such as lithography machines and wafer inspection tables.

Tooth slot and friction compensation: Based on learning algorithms, automatically identify the motor tooth slot torque and guide rail friction, generate feedforward compensation, make low-speed motion smoother, and reduce speed fluctuations by more than 80%.

Longmen control: For the dual drive Longmen structure, the controller has a built-in cross coupling algorithm to compare the position deviation of the two axes in real time, output adjustment torque, and significantly shorten the synchronization setting time (experimental data shows that it can reduce 50% of the stabilization time).