Sigma-II Series SGM*H/SGDH USER'S MANUAL - Esco Drives ...

6.4 Others6.4 Others6.4.1 Wiring PrecautionsTo ensure safe and stable operation, always observe the following wiring precautions.IMPORTANT1. For wiring for reference inputs and encoders, use the specified cables. Refer to 5 Specifications andDimensional Drawings of Cables and Peripheral Devices for details.Use cables as short as possible.2. For a ground wire, use as thick a cable as possible (2.0 mm 2 (0.003 in 2 ) or thicker).• At least class-3 ground (100 Ω max.) is recommended.• Ground to one point only.• If the servomotor is insulated from the machine, ground the servomotor directly.3. Do not bend or apply tension to cables.The conductor of a signal cable is very thin (0.2 to 0.3 mm (0.0079 to 0.012 in)), so handle the cables carefully.4. Use a noise filter to prevent noise interference.(For details, refer to 6.4.2 Wiring for Noise Control.)• If the equipment is to be used near private houses or may receive noise interference, install a noise filter onthe input side of the power supply line.• Because the SERVOPACK is designed as an industrial device, it provides no mechanism to prevent noiseinterference.5. To prevent malfunction due to noise, take the following actions:• Position the input reference device and noise filter as close to the SERVOPACK as possible.• Always install a surge suppressor in the relay, solenoid and magnetic contactor coils.• The distance between a power line (such as a power supply line or servomotor cable) and a signal line mustbe at least 300 mm (11.81 in). Do not put the power and signal lines in the same duct or bundle themtogether.• Do not share the power supply with an electric welder or electrical discharge machine. When the SERVO-PACK is placed near a high-frequency generator, install a noise filter on the input side of the power supplyline.6. Use a molded-case circuit breaker (QF) or fuse to protect the power supply line from high voltage.• The SERVOPACK connects directly to a commercial power supply without a transformer, so always use aQF or fuse to protect the SERVOPACK from accidental high voltage.7. The SERVOPACKs do not have built-in ground protection circuits. To configure a safer system, installan earth leakage breaker for protection against overloads and short-circuiting, or install an earth leakagebreaker combined with a wiring circuit breaker for ground protection.66-19