Pacific Scientific SCE900 Servo Drive Complete Guide

3.2 SCE903 (Medium Power)

SCE903 is suitable for three-phase 180-528VAC power supply, with a peak current of 10.6A and a continuous current of 5.3A under convection cooling at 25 ° C, maintained at 5.3A under forced air cooling at 50 ° C, and 3.5A under convection cooling at 50 ° C. The peak power reaches 5kW (1 second) at 400VAC and 6kW at 480VAC, with a corresponding continuous power of 2.5kW (25 ° C convection) or 2.1kW (50 ° C convection). This model is suitable for most industrial single axis applications, such as X-Y worktables, flying shears, and winding machines. The size is 370 × 85 × 229mm and weighs approximately 5.0kg.

3.3 SCE904 (medium high power)

The peak current of SCE904 is 21.2A, and the continuous current is 10.6A (25 ° C convection or 50 ° C forced air cooling). The 50 ° C convection cooling drops to 7.1A. The peak power is 10kW at 400VAC and 12kW at 480VAC; the continuous power corresponds to 5.0kW (25 ° C convection) or 3.3kW (50 ° C convection). Its power level is suitable for high load applications such as large CNC machine tools and injection molding machine parts taking manipulators. Size 370 × 114 × 229mm, weight approximately 6.6kg.

3.4 SCE905 (High Power)

SCE905 is the most powerful model in the series, with a peak current of 31.8A and a continuous current of 15.9A (25 ° C convection or 50 ° C forced air cooling). The 50 ° C convection cooling drops to 10.6A. The peak power is 15kW at 400VAC and 18kW at 480VAC; the continuous power is 7.5kW (25 ° C convection) or 5.0kW (50 ° C convection). This model is suitable for heavy-duty servo presses, large flying saws, centrifugal test benches, etc. Size 370 × 160 × 229mm, weight approximately 9.5kg.

3.5 Power Supply and Bus Voltage

The AC power input range of SCE903/904/905 is 180-528VAC, three-phase, 47-63Hz. The nominal bus voltage under different input voltages is: 480VAC three-phase input → 650VDC; 400VAC three-phase input → 540VDC; 240VAC three-phase input → 320VDC. The control power supply is 90-264VAC single-phase, with power-off holding time: it can maintain 1 cycle at 90VAC 50Hz, 2.5 cycles at 120VAC 60Hz, and 10 cycles at 240VAC 60Hz. The control power supply of SCE902 shares the same input terminal with the main power supply, with a voltage range of 90-264VAC single-phase or three-phase.

Modular design and tabs

The SCE900 series adopts a modular structure, and users can choose different tabs to insert into the expansion slot at the front of the drive according to their needs. This design allows the same base driver to adapt to multiple command sources and communication protocols.

4.1 Available Tabs

OCE900-001: Blank panel, used to cover tab slots, suitable for low-cost applications where parameters have been solidified in the base drive.

OCE930-001-00/01: Serial Communication tab, providing RS-232 or RS-485 interfaces for parameter settings and command control. Comes with 930WIN configuration software. The suffix -01 includes the software upgrade function for the base driver.

OCE940-001-01: ERCOS interface tab, based on fiber optic ring network industrial standard motion control bus, supports multi axis high real-time synchronous control.

OCE950-50x-01: Standard single axis programmable positioning tab, built-in non-volatile RAM (32KB or 128KB), can independently run motion programs, supports PacLAN network.

OCE950-60x-01: Enhanced single axis programmable positioning tab, adding MODBus, Allen Bradley DF-1 communication, and electronic cam functions on the basis of the standard version.

4.2 Mobile personality parameters

One important feature of SCE900 is the 'movable personality parameter'. All system parameters and application parameters of the drive are stored in EEPROM (with a typical write life of 1 million times). Users can configure the driver through the tab, then save the parameters to the internal non-volatile memory of the base driver, and then remove the tab and cover it with a blank panel. This not only reduces costs but also prevents unauthorized parameter modifications on site. On the contrary, if the parameters are stored on a tab, when replacing the damaged base drive, simply insert the original tab into the new drive without downloading the parameters again to restore all settings of the axis.

Interface and Input/Output Definition

All connections of SCE900 series drives use pluggable terminals and are designed to prevent misconnection. The main connectors include:

5.1 Power connector

J1 (AC main power supply): L1, L2, L3 three-phase inputs (SCE902 is single-phase/three-phase shared), and PE chassis grounding terminal.

J6 (control power supply): N and L1 terminals, accepting 90-264VAC single-phase control power supply. Also provide PE terminals.

J2 (motor power output): U, V, W three-phase motor phase line output, and motor housing grounding terminal.

5.2 Feedback connector J3

Resolver signal: S1 (SIN+), S3 (SIN -), S2 (COS+), S4 (COS -) differential input, input impedance>25k Ω, strong common mode rejection capability.

Resolver excitation: R1 (excitation output), R2 (excitation return). Output 9.2V RMS, 6510.42Hz, maximum load 75mA RMS, with short-circuit protection.