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

6 Wiring6.4.2 Wiring for Noise Control6.4.2 Wiring for Noise Control(1) Wiring ExampleThe SERVOPACK uses high-speed switching elements in the main circuit. It may receive “switching noise”from these high-speed switching elements if the processing of wiring or grounding around the SERVOPACK isnot appropriate. To prevent this, always wire and ground the SERVOPACK correctly.The SGDH SERVOPACK has a built-in microprocessor (CPU), so protect it from external noise as much as possibleby installing a noise filter in the appropriate place.The following is an example of wiring for noise control.200 VAC23.5 mm2(0.005 in )min. ∗1Noise filter ∗32LFSERVOPACKL1UL2VL3WL1C CN2L2C CN1ServomotorM(FG)PG2.0 mmOperation relay2(0.003 in 2 )sequencemin .Signal generationcircuit (provided bycustomer)∗3 ∗2AVR1LF(Ground)3.5mm2(0.005 in 2)2 mm 2 2min.(0.003 in ) min.(Casing) (Casing)2 2 ∗(Casing) 3.5mm (0.005 in ) min. 12Wires of 3.5 mm2 ∗1(0.005 in ) or more(Casing)(Ground plate)Ground: Ground to an independent ground(at least class-3 grounding (100 Ω max).)∗1 For ground wires connected to the casing, use a thick wire with a thickness of22at least 3.5 mm (0.005 in ) (preferably, plain stitch cooper wire)∗2 : represents twisted-pair wires.∗3 When using a noise filter, follow the precautions in 6.4.2 Wiring for Noise Control(3) Using Noise Filter.(2) Correct Grounding(a) Grounding the Motor FrameAlways connect servomotor frame terminal FG to the SERVOPACK ground terminal . Also be sure toground the ground terminal .If the servomotor is grounded via the machine, a switching noise current will flow from the SERVOPACKpower unit through servomotor stray capacitance. The above grounding is required to prevent the adverseeffects of switching noise.(b) Noise on the Reference Input LineIf the reference input line receives noise, ground the 0 V line (SG) of the reference input line. If the main circuitwiring for the motor is accommodated in a metal conduit, ground the conduit and its junction box.For all grounding, ground at one point only.6-20