PS-3303D-E Danaher
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The Danaher PS-3303D-E is a servo drive in the API Servo Drives series, featuring a 10-bit analog resolution and supports encoder or hall feedback devices. It is equipped with a 20 MHz processor clock, 64K RAM, 128K flash memory, and a RS-232 serial interface. The drive can handle a maximum cabinet power of 60 W, has an overvoltage trip point of 400 VDC, and an external regeneration power rating of 150 W with a 47 Ohm resistor.
Internal Product Review
The PS-3303D-E is a Danaher API servo drive with Encoder/Hall feedback and an RS-232 serial interface. Fast 100 us current loop updates and 400 us velocity loop updates support responsive, stable motion control. The 150 W external regen capability is a strong advantage for dynamic servo applications.
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Product Description:
The PS-3303D-E is a servo drive produced by Danaher for the API Servo Drives series. Designed to modulate power to a brushless motor, the unit executes current, velocity, and position commands sent by higher-level motion controllers. By integrating power electronics with closed-loop control processing, it regulates torque and speed in automated machinery while accurately following encoder and Hall feedback. The drive acts as the electrical interface between low-level command signals and the mechanical output of the motor shaft.
Analog conversion inside the controller uses a 10-bit resolution, so command voltages are digitized into 1,024 discrete steps. Communication over the RS-232 port operates at 19,200 baud for compatibility with configuration tools. The electronics draw up to 60 W from the cabinet supply, including the power required by the gate drives and logic rails. Torque regulation is refreshed every 100 µs in the current loop, while the velocity and position loops close at intervals of 400 µs and 2,000 µs, respectively. This timing arrangement allows the current loop to respond more quickly than the outer motion-control loops. Encoder and Hall signals provide the primary feedback, and motion parameters are stored in 128 KB of onboard flash memory so tuning data is retained across power cycles.
For dynamic braking, the internal chopper diverts excess energy to an external 47 Ω resistor bank capable of dissipating 150 W once the DC bus reaches the 377 V threshold. Overvoltage protection trips the unit at 400 VDC during severe regenerative events, while a supply drop below 90 VDC triggers an undervoltage fault to protect the logic rails. A processor operating at 20 MHz works with 64 KB of RAM to run the control software and manage real-time tasks without excessive timing variation. The braking circuit manages energy returned by the motor during rapid deceleration and direction changes. Separate overvoltage and undervoltage thresholds protect the drive when the DC supply moves outside its permitted operating range.
