Pacific Scientific SCE900 Servo Drive Complete Guide

8.2 Shielding and Grounding

The shielding layer of the motor cable must be connected to the PE pin of J2 at the driver end, and the shielding layer must be connected to the grounding plate (ground plane) with conductive clamps. If a cable with inner aluminum foil shielding and outer braided shielding is used, the inner layer should be connected to a PE pin and the outer layer should be clamped to the grounding plate.

Resolver cables should have independent internal shielding for each pair of twisted pair cables, plus total braided shielding. The inner shield is connected to J3 pin5, and the outer shield is clamped to the grounding plate.

The outer braided shield of the J4 command I/O cable needs to be clamped to the grounding plate.

The leads of the external braking resistor also need to be shielded and clamped to the grounding plate.

All shielding connection points need to remove the paint coating to ensure good high-frequency grounding.

8.3 Heat dissipation requirements

The driver must be installed vertically inside the cabinet, leaving at least 100mm of unobstructed space above and below. During convective cooling, a free space of 40mm is required on both sides; When forced air cooling (optional OFE90x fan) is used, there is no need to leave space on both sides. It is necessary to ensure that the chassis temperature does not exceed the specified value. SCE9x3 only requires convective cooling; SCE9x4/9x5 comes with optional 120VAC or 240VAC fan kits. Under convective cooling at 25 ° C, it can output continuous current at full capacity; At 50 ° C, it is necessary to reduce the rating or use forced air cooling.

8.4 External fuses

SCE903: 10A 500V slow melting fuse (Bussmann FLQ 10); SCE904: 15A 500V； SCE905: 20A 500V。 The J6 circuit of the control power supply uses a 1A 250V slow melting fuse (3AG or FLM 1). The SCE902 main power supply uses a 15A 250V delay fuse (Bussmann MDA-15).

8.5 Regenerative braking and external resistance

The driver integrates a brake chopper and an internal regenerative resistor. The internal resistance of SCE9x3 is 80W, and the internal resistance of SCE9x4/9x5 is 36W. If the regenerative energy exceeds the internal resistance capacity, an external resistor can be connected between+Bus and R at the J5 terminal (the short wire between Ri and R needs to be removed). External resistance values: SCE9x3 is 80 Ω± 10%, SCE9x4/9x5 is 36 Ω± 10%. The power rating of external resistors should be calculated based on the load inertia and deceleration, and if necessary, a series parallel combination should be used.

Software configuration and debugging

When the SCE900 is paired with the OCE930 tab, it can be configured using the 930WIN.EXE software (running on Windows 3.1/95). When the driver leaves the factory, it is in an unconfigured state (status display "U C"), and motor parameters, feedback types, current limits, control loop parameters, etc. must be set through software. The software provides Auto Setup mode, where users only need to answer questions about motor model, rated current, pole pairs, etc. The software automatically calculates and writes parameters. After configuration, the parameters can be stored in the base EEPROM or tab EEPROM. In addition, the driver also supports real-time modification of parameters and monitoring variables (such as speed, current, temperature, fault codes, etc.) through digital communication.

For the OCE950 programmable positioning tab, users can use the 950IDE integrated development environment to write BASIC style motion programs that enable single axis independent operation, including jog, absolute positioning, relative positioning, zeroing, conditional jump, I/O control, and support for electronic gears and electronic camshafts (enhanced version).