Pacific Scientific Servo Drive Selection Guide

5.2 Power level

The SC/SCE900 series offers a complete selection from low power to high power:

Model: Continuous Current (A 0-p) Peak Current (A 0-p) Continuous Power (kW) @ 400V Peak Power (kW) @ 400V

SCE9x2 3.75 7.5 1.1 2.2

SC9x3 / SCE9x3 5.3 10.6 2.5 5.0

SC9x4 / SCE9x4 10.6 21.2 5.0 10.0

SC9x5 / SCE9x5 15.9 31.8 7.5 15.0

SCE9x6--18.0 27.0 (estimated)

Note: SCE9x6 is a high-power model (see selection table, specific parameters need to refer to the factory).

SC9xx series input voltage: 180-264V AC three-phase, nominal bus 320V DC.

SCE9x2 input: 90-264V AC single-phase or three-phase, nominal bus 320V DC (three-phase) or 155V DC (single-phase).

SCE9x3/4/5/6 input: 180-528V AC three-phase, nominal bus 540V (400V AC input) or 650V (480V AC input).

All models are equipped with built-in power supply and brake chopper. The control power supply is 90-264V AC single-phase, with power-off hold function (up to 10 cycles). For SCE902, an external MTE 25CE4 filter is required to achieve CE compliance; For SCE903-906, no external filter is required when the cable length is less than 10 meters.

5.3 Core Features

Full digital control: current loop 62.5 μ s, speed loop 250 μ s, position loop 1ms. Speed loop bandwidth>400Hz, position loop bandwidth>100Hz.

Resolver feedback: 24 bit resolution, repeatability ± 0.08 arcminutes RMS, noise<0.3 arcminutes RMS (unfiltered). Speed feedback accuracy ± 0.01% (typical), ripple 0.75% p-p (1000 rpm, driver itself).

Encoder simulation output: programmable in binary (128-16384 PPR) or decimal (125-16000 PPR), with a maximum output frequency of 833kHz.

I/O：

Differential ± 10V analog input

2-channel ± 5V analog output (can map 28 internal signals, such as speed, current, position error, bus voltage, etc.)

6-way bidirectional digital I/O (BDIO), programmable as input or output, TTL or 24V compatible, open collector electrode output (30V/100mA, BDIO6 is 200mA)

Enable input (optocoupler isolation, 5V or 12V logic threshold optional)

Encoder input (orthogonal/step/direction/addition and subtraction pulses, maximum decoding rate of 800kHz)

+5V/200mA user output

Front panel: Seven segment LED displays status and fault codes (such as "0" indicating no fault and power level disabled, "8" indicating normal enable, flashing codes indicating specific faults).

Environment: Operating temperature 0-50 ° C (full rated current), storage -40-70 ° C, humidity 10-90% without condensation. At an altitude of 1500 meters. SCE900 model CE certification (low voltage directive and EMC directive), SC900 model UL approval.

5.4 Tab Explanation

The core advantage of the SC/SCE900 series lies in three pluggable tabs, which not only add functionality but also serve as carriers for "movable personality parameters".

5.4.1 OC/OCE930 Serial Communication Tab

Function: Provides RS-232 or RS-485 serial interface for parameter setting, automatic tuning, real-time monitoring, and command control.

Software: Comes with 930 Dialogue (Windows 3.1/95 program), supports automatic tuning, parameter upload/download, and variable monitoring.

Removable personality: Drive parameters can be stored in the EEPROM of the tab, and there is no need to reconfigure when replacing the base drive.

Firmware upgrade: The suffix -01 version includes a software upgrade function for the base driver.

5.4.2 OC/OCE940 SERCOS Interface Tab

Function: SERCOS international standard interface (IEC 61491) based on fiber ring network, realizing high-speed real-time data exchange between controller and driver.

Performance: Communication speed up to 16 MHz, supporting up to 16 axes updating position/speed/torque commands every 2 milliseconds.

I/O: The tab comes with 8 optocoupler isolated inputs and 8 outputs (5-30V compatible).

Advantages: One fiber optic cable can replace dozens of analog and encoder cables, with strong anti-interference ability and low wiring costs.

5.4.3 OC/OCE950 Programmable Single Axis Positioning Tab

Function: Transform the SC/SCE900 driver into a complete single axis motion controller with an Intel microcontroller built-in, using the ServoBASIC Plus programming language (BASIC like structure).

Programming environment: Windows development environment, including powerful interactive debuggers, variable monitoring windows, and modular programming.

I/O Expansion: Provides 21 configurable bidirectional digital I/O ports (compatible with Opto-22), along with 6 BDIOs on the base, for a total of 27 I/O. Supports 8 programmable limit switches.

Communication options:

PacLAN: 2.5 Mbaud token ring network, capable of connecting up to 255 drives.

DF-1 protocol (Allen Bradley PLC compatible)

Modbus protocol (compatible with Modicon PLC)

Memory: 32KB NVRAM (optional 128KB), used for storing programs and parameters.

Advanced features: electronic cam, electronic gear, motion interruption, program variable triggering, etc.

5.5 System Connection and Application Topology

SC/SCE900 supports multiple system architectures:

Analog control: The external motion control card outputs a ± 10V speed/torque command, the driver is closed-loop, and the encoder simulates the output feedback to the controller (Figure 1).