PWM Servo Systems Archives - Pico Systems

(a) Universal PWM Servo Controller

Jon Elson — Tue, 28 Jan 2025 01:44:41 +0000

A 4-axis controller for digital PWM servo amplifiers, it contains 4 encoder counters, 4 PWM generators and digital I/O. Connection to the computer is via the parallel port.

The encoder counters can handle count rates up to ten megaHertz on each axis simultaneously. The PWM generators have a 25 ns granularity, so they can do 1/8 % resolution at 50 KHz (800 discrete pulse widths). At higher PWM frequencies the resolution is coarser in percentage terms, at lower frequencies it becomes finer.

There are 16 optoisolated digital inputs, one is dedicated to the E-stop system. The rest can be used for home and limit switches, jog pendants, or whatever else is needed. There are sockets on the board to mount up to 8 solid state relays, either AC or DC output.

An optional board can be added to provide analog output to control spindle speed, see: Spindle DAC. This device is fully supported by the LinuxCNC program.
Technical Info

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Fanuc Encoder Converter

dhqro — Mon, 20 Jan 2025 23:38:50 +0000

This board converts the proprietary Fanuc commutation encoder signals to industry-standard "Hall" signals compatible with most brushless drives such as Servo Dynamics, Copley Controls, AMC, and, of course, our own PWM brushless servo amplifiers. It uses the proprietary Fanuc signals until the motor has moved to the index pulse position for the first time, then it counts quadrature encoder signals after that for better precision of the commutation. It can accept encoder resolutions of 1000, 2000, 2500, 3000 and 10,000 cycles (pulses) /rev. The encoder resolution is set with jumpers. This board can also be used as a differential line receiver for the ABZ encoder signals, and repeats these signals for use by the CNC control and/or brushless drive. The new model now supports both the original red-cap encoder (such as A860-0304-T111) and the ABS encoder (such as A860-0320-T111).
Technical Info

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Fanuc Serial Encoder converter (pulse coder)

dhqro — Mon, 20 Jan 2025 23:38:49 +0000

Converts signals from Fanuc Serial pulse coders to quadrature with commutation (Hall) signals.

Supports resolutions from 32K to 1024K counts/rev, and both absolute and incremental versions.

Absolute encoders can produce commutation signals immediately at power-on, with no battery required. Incremental encoders require backup batteries for the encoder to produce commutation outputs at power on. Otherwise there is no commutation output until the encoder has been turned manually to the index location.Technical Info

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Panasonic Encoder Converter

dhqro — Mon, 20 Jan 2025 23:38:49 +0000

A converter for encoded commutation signals on some brushless motors, such as the Panasonic MUMS (Minas) series. Converts Panasonic ‘s serial commutation signals to standard “Hall” signals for use with Pico Systems and other brushless motor drives. If you have another type of motor with non-standard commutation signals, check with us to see if we can support those motors, too.

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Spindle DAC

dhqro — Mon, 20 Jan 2025 23:38:48 +0000

8-bit Digital to Analog converter, generally used for controlling a spindle motor drive. It can be attached to any USC or UPC board, and is controlled by the PPMC driver in LinuxCNC. It is capable of outputting 0 to +10 V or -10 to +10 V, as selected by jumpers. If set for bipolar output, it watches SSR 's 1 and 2 for polarity. A cable to connect to controller board is included.
Technical Info

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Connector Panel

dhqro — Mon, 20 Jan 2025 23:38:46 +0000

A panel for connecting up to 4 axes to the PWM controller board. It allows connecting all wires for each axis through a single AMP Circular Plastic Connector, including motor power, enocder and home and limit switches. Either single-ended or differential encoder signals are accomodated, and motor commutation signals for brushless motors are handled, too.
Technical Info

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Heat Sink for PWM servo amps, pre-drilled

dhqro — Mon, 20 Jan 2025 23:38:46 +0000

This is a heat sink to fit 4 PWM brush servo amps, or 3 servo amps plus a power switch module. It serves as both the heat sink and a way to mount the servo amps in the cabinet.
Technical Info

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Size 23 Brushless Servo Motor

dhqro — Mon, 20 Jan 2025 23:38:46 +0000

This is a NEMA size 23 brushless servo motor with .43 Nm (61 Oz-In) continuous torque and 1.27 Nm (180 Oz-In) peak torque. It is fitted with an encoder with index pulse. Default resolution is 1000 cycles/rev (4000 quadrature counts/rev) but a number of other encoder resolutions can be had. The motor body (including encoder) is 130 mm (5.1″) long, not counting the front shaft. The shaft is 1/4″ diameter (6.35 mm).

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(b) PWM Servo Amplifier

dhqro — Mon, 20 Jan 2025 23:38:45 +0000

120 Volt 20 Amp PWM-input servo amplifier for DC brush motors. Takes digital PWM and direction inputs from controller board. A resistor selects the peak current permitted to flow to the motor. A fixed high-side fault detection circuit puts the amp into E-stop and signals the controller that a fault has occurred.

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(c) Brushless PWM Servo Amplifier

dhqro — Mon, 20 Jan 2025 23:38:45 +0000

PWM-input servo amp for Brushless motors. Requires 3 commutation signals (commonly known as “Hall” signals) from motor or encoder. Output up to 120 V at 20 A. Takes digital PWM and direction inputs from controller board. A resistor selects the peak current permitted to flow to the motor. A fixed high-side fault detection circuit puts the amp into E-stop and signals the controller that a fault has occurred.

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