YASKAWA S-7 series linear servo

Static electricity protection: When touching the encoder or serial conversion unit, first release human static electricity (touching the grounded metal), and do not directly touch the pins with your hands;

Leakage protection: Motors with built-in EMC filters may experience leakage currents exceeding 3.5mA, requiring the use of Type B residual current monitors (RCM/RCD).

(2) Mechanical safety

Fall prevention measures: When installed vertically, a counterweight or braking device should be installed to prevent the load from falling during power outages;

Limit protection: Install mechanical limit switches at both ends of the motor stroke to avoid collisions caused by overtravel;

Strong magnetic protection: During transportation and installation, the magnetic track needs to be packaged with special anti magnetic materials to avoid adsorption and compression with other magnetic components.

(3) Operational safety

Personnel qualifications: Only qualified engineers who have received training can carry out installation, wiring, and maintenance;

Prohibition of modification: It is not allowed to disassemble the motor winding, magnetic track or modify the circuit, otherwise the warranty will be invalid and may cause safety accidents;

High temperature protection: When the motor is running, the temperature of the winding and magnetic track may exceed 60 ℃, and a protective cover plate should be installed to avoid touching and scalding.

2. Compliance standards

North American standards: UL 1004-1, UL 1004-6, CSA C22.2 No.100, branch circuit protection requires the use of specified semiconductor fuses;

EU standards: CE certification (EMC Directive 2014/30/EU, LVD Directive 2014/35/EU), compliant with EN 61800-3 (C2 environment) EN 60034-1；

Environmental standards: RoHS Directive 2011/65/EU restricts six hazardous substances such as lead and mercury, and scrap must follow the classification and disposal requirements of the WEEE Directive.

Maintenance and disposal

1. Regular maintenance projects

(1) Daily inspection (daily)

Operating status: Monitor the motor for any abnormal noise or vibration, and observe that the cables are not pulled or worn;

Appearance inspection: The surface of the magnetic track is free of dust and metal shavings, the plastic shell of the rotor is free of cracks, and the screws are not loose;

Indicator light: The servo amplifier no alarm indicator light is on, and the encoder signal is normal.

(2) Regular inspection (annually)

Gap calibration: Use a non-magnetic feeler gauge to re measure the gap between the rotor and the magnetic track. If the deviation exceeds 0.5mm, it needs to be adjusted;

Insulation testing: Disconnect the servo amplifier and measure the resistance between the motor U/V/W terminal and FG terminal with a 500VDC insulation resistance meter. A resistance of ≥ 10M Ω is considered normal;

Cable inspection: The cable shielding layer is not damaged, the joints are firm, and there is no aging or cracking at the bends;

Water cooling system (if any): Check that there is no water leakage in the pipeline, the quality of the cooling medium meets the standard, and the filter is not clogged.

(3) Overhaul cycle (every 5 years)

Contact YASKAWA technical personnel for comprehensive maintenance, including winding insulation testing, magnetic track detection, and sensor calibration;

Replace vulnerable parts: cooling fan (self cooling model), cables (frequently bent scenario), seals (water-cooled model).

2. Troubleshooting

(1) Common faults and solutions

Possible causes and solutions for the fault phenomenon

Abnormal installation spacing of encoder signal, cable interference, encoder damage, adjustment of encoder installation spacing (10-40mm), replacement of shielded cable, detection of encoder output signal

Motor overload alarm for excessive load, short acceleration time, thermal protector triggering to reduce load, extending acceleration time (parameter C1-01), checking thermal protector wiring

Insufficient thrust, large gap between magnetic track and rotor, low power supply voltage, incorrect phase wiring, calibration gap to standard range, detection of power supply voltage (200V ± 10%), verification of U/V/W phase wiring

Cable breakage with a small bending radius, repeated pulling and abrasion, replacement of cables with increased bending radius, fixing cables to avoid pulling, and installation of protective sleeves

(2) Principle of investigation

Turn off the power before troubleshooting, and prohibit live measurement signals;

First check the mechanical parts (gaps, fixing screws), then check the electrical parts (wiring, cables);

When troubleshooting is not possible, record the fault code and operating parameters, and contact YASKAWA technical support.

3. Scrap disposal

Demagnetization treatment: The magnetic track needs to be heated to above 300 ℃ and maintained for 1 hour to eliminate magnetism and avoid damage caused by strong magnetic adsorption;

Classification and disposal: Follow local environmental regulations, separate electronic components (windings, sensors), metal components (magnetic tracks, shells), and plastic components, and recycle them separately;