Osai Servo System (OSS)

General Description

OSSplus is a servo system family for axis movement. The drive comprises the power supply and the electronic part for power control. Its main features are:

• Power supply for single phase 230 VAC nets (three phase for the 75 A version)
• Internal or external brake resistor
• Separate aux power supply for the electronics
• Integrated power supplies
• Optimised control for sinusoidal synchronous motors
• Completely digital controls based on two microprocessors
• High level integration with ASIC and IPM components
• 16-bit A/D converter
• Flash memory for easy updating at customer site
• Factory installed personality module, which can be transported at drive exchange
• Internal connections without cables
• Internal filters for electromagnetic compatibility
• Large number of inputs and outputs
• Compliance with the standards required for the CE label

There is a wide range of sinusoidal synchronous motors with permanent magnets for connection to the drive. You can choose between two technologies: the F series with ferrit magnets and the H series with rare earth magnets. The F series with its medium inertia is suited for applications with high inertia load. The H series with low inertia is preferable for dynamic applications with high acceleration. The main characteristics of the motors are:

• Continuous torque from 0.5 to 50 Nm
• Maximum speed up to 6000 RPM
• Integrated thermo sensor
• Integrated optical encoder, 2000 pulses/rotation
• Versions with integrated brake
• Protection grade up to IP65

OSSplus Master is a software package for setting up and programming the drive. It can be executed on a PC in the Windows environment and is also used for displaying the parameters and diagnostics. The main features are:

• Drive Set Up: for displaying the drive type and choosing the motor
• Drive Parameters: For accessing the most common parameters such as command type, current limitation and protection threshold
• I/O Configuration: For assigning functions to the programmable inputs/outputs and programming the brake timing
• Tuning: For automatic or manual gain tuning
• Oscilloscope: Two channel oscilloscope for displaying the physical quantities relating to drive functioning
• Diagnostics: For displaying the input status and changing the output status. It also displays error conditions and memorises the previous errors

System Configuration

An OSSplus system consists of:

• One drive module
• One F or H type motor
• Connection cables between motor, drive and numeric control
• Various accessories

In addition to these units you have to provide:

• One power connection
• Input fuses
• Transformer, if a 230 VAC is not available

Drive Module

There are 5 versions of the drive module with continuous current from 5 to 35 A. They have to be connected to three phase 230 VAC power nets. The drive powers the motor with three phase alternating current to achieve the speed or the torque according to the analogue command from a controller.

Motor

The motors of the H series come with continuous torque between 0.56 to 21 Nm if driven by drives of the OSSplus series. For F type motors the equivalent data are from 3.5 to 21.4 Nm.

Cables

The cables were specifically developed for use with the OSSplus system. These cables warrant a higher shielding level, fast connection system and IP67 protection on the motor connectors.

• Motor cables: These connect the drive to the motor, one for the encoder and one for power. They are certified for a length of 30 meters. The cables, as well as the connectors, are completely shielded, guarantee signal integrity and comply to the EMC standards
• CNC Cables: These two cables have been designed for the connection with OSAI controllers, one for the encoder signals and the analogue command, the other for the I/O signals. The two cables are sufficient for setting up a typical application
• Alternatively, there is a cable which makes all drive signals available via a terminal strip of 50 lines. The terminal strip has to be ordered separately. It is recommended for applications making use of some special drive features, e.g. the programmable inputs / outputs

Accessories

• Shaft oil seal kit: for IP65 on the motor shaft
• Gear box: Available for the motors S-3000, S/F-4000 and S/F-6000. The kit contains the adapter flange, mounting components and instructions. The reduction ratios are 5, 12 and 20
• Line Filters: For applications requiring the CE label for the machine. For each drive model there is a certain certified filter type
• Brake Resistor: The external resistor can handle regenerative loads beyond the capacity of the resistor integrated in each system module. During the brake cycle there is high tension between the two ends of the resistor and its temperature can reach dangerous levels. For this reason it has to be equipped with protection covers or other protection to comply with the safety standards. The resistor may be necessary in applications with high inertia loads, low friction and frequent brake cycles
• Programming Module (TouchPad): This can be used for drive configuration and diagnostics as an alternative to the OSSplus Master. It is directly installed on the drive's serial connector and has an 8 character alphanumeric display and 5 keys

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