Aerotech NDrive HL linear drive maintenance replacement

Aerotech NDrive HL linear drive maintenance replacement

In the extension and transformation of industrial motion control systems, replacing discontinued servo drives is often more complex than debugging new equipment. Engineers not only need to verify current, voltage, and size, but also confirm feedback type, communication network, I/O logic, position synchronization output, and regenerative energy processing. The Aerotech NDrive HL is a network digital linear drive in the Automation 3200 motion system, which uses linear power levels and features low noise, zero crossover distortion, and high bandwidth. It is suitable for ultra precision machining, optical inspection, nano positioning, and other applications that require high dynamic performance and electromagnetic interference. This article summarizes the key technical information of NDrive HL from the perspectives of maintenance, troubleshooting, and replacement selection.

Model and core specifications of NDrive HL

NDrive HL mainly includes three basic models: HL 20-40, HL 10-40, and HL 10-80. HL 20-40 adopts a ± 40 VDC bus with a peak output current of 20 A and a continuous output current of 10 A. HL 10-40 is also a ± 40 VDC bus with a peak value of 10 A and a continuous output current of 5 A. HL 10-80 adopts a ± 80 VDC bus with a peak value of 10 A and a continuous output current of 5 A. The continuous power coverage is about 675 W to 1350 W, and the peak power is about 675 W to 1350 W. The main power input is 100, 115, 200, 230 VAC, 50/60 Hz, single-phase, depending on the model configuration.

Linear power level is different from PWM power level. Each phase of NDrive HL can be rail to rail output, as its driving power supply is not directly taken from the positive and negative busbars. The power amplifier has a gain of 2, 1, and 1 A/V per phase, a bandwidth of approximately 2 kHz, a minimum load inductance of 0 mH, and a minimum load resistance (line to neutral) of 0.5 Ω. This means that HL can drive low inductance, low resistance linear motors or voice coil motors, while ordinary PWM drivers may be limited by current ripple and heat generation. Linear amplifiers have no PWM switching noise, resulting in extremely low EMI/RFI emissions, making them suitable for noise sensitive measurement and imaging devices.

The working environment temperature is 0-50 ° C, the storage temperature is -30-85 ° C, the humidity is up to 80% below 31 ° C, and then linearly decreases to 50% at 40 ° C. It is non condensing and has an altitude of up to 2000 meters. The weight is about 22.0 lb (9.98 kg), and after installing - IOPSO or - IOPSO H, it is about 22.2 lb (10.07 kg). The temperature of the chassis may exceed 75 ° C in some applications, so it is necessary to leave one inch of free air space during installation and be aware of the risk of burns.

Feedback, I/O, and communication capabilities

NDrive HL supports brushless, brushed, and stepper motors. The standard feedback is a line driven square wave or analog sine orthogonal encoder. The main encoder channel J207 receives Sin/Sin-N, Cos/Cos-N, Marker/Marker-N, 0-5 VDC RS-422 differential signals, with a maximum encoder signal of 8 MHz. After x4 orthogonal decoding, it can reach 32 million counts/s. Optional MXH analog encoder multiplication supports up to 200 kHz input frequency, multiplication factor 1-512, with a maximum of x2048 when combined with controller x4. MXH supports PSO and real-time orthogonal output, but after changing the multiplication parameters, internal erasing and reprogramming take about 3.5 minutes, during which the LED will flash and the axis cannot be enabled.

In terms of I/O, the standard configuration includes 4 optical isolated outputs, 6 optical isolated inputs (including 2 high-speed inputs), 2 differential analog inputs (one standard and one provided with IOPSO), and 2 analog outputs. -The IOPSO expansion board adds 8 optical isolated inputs, 8 optical isolated outputs, 2 18 bit analog outputs, and 2 16 bit differential analog inputs SSI Net、 Absolute encoder interface and brake relay. -IOPSOH increases the output to 1 A per channel. If PLC type I/O expansion is required, an optional - ENET 10/100BASE-T Ethernet port can be used to connect third-party I/O via ModBus TCP.

The communication core consists of FireWire J201, J202, and J203, with a speed of 400 Mbps and three ports connected in parallel. The multi axis system recommends a star daisy chain with a maximum of 32 axes, and a single chain with a maximum of 16 drivers. Each NDrive HL must be assigned a unique communication channel number through the S2 switch, usually numbered sequentially starting from 1. RS-232/RS-422 J206 is mainly used for firmware upgrades and auxiliary communication. When replacing, it is necessary to confirm the FireWire topology, channel number, and controller axis mapping of the original system, otherwise the new drive may not be recognized.

PSO, MXH and multi axis laser triggering

Position synchronization output is a key function of NDrive HL in laser processing, visual inspection, and aerial photography. The standard single axis PSO can track the main encoder, auxiliary encoder, SSI Net, or software trigger, with a single axis tracking rate of up to 20 MHz and a trigger delay of about 200 ns. - DUALPSO and - TRIPLEPSO support two - or three-axis vector position triggering with a delay of about 275 ns, and the multi axis tracking rate is limited to 5 MHz. The PSO hardware uses a 255 level FIFO queue internally, with programmable pulse configuration, window mode, data capture, and data update modes. Output options include high-speed optical isolation J301, J205 output 11 (up to 1 kHz) or RS-422 Marker output (up to 10 MHz).