Mitsubishi Electronics MR-J2S- CL Relays, Surge absorbers, Noise reduction techniques, 14

14. OPTIONS AND AUXILIARY EQUIPMENT

14.2.4 Relays

The following relays should be used with the interfaces:

Interface	Selection example
Relay used for input signals (interface DI-1) signals	To prevent defective contacts , use a relay for small signal
	(twin contacts).
	(Ex.) Omron : type G2A , MY
Relay used for digital output signals (interface DO-1)	Small relay with 12VDC or 24VDC of 40mA or less
	(Ex.) Omron : type MY

14.2.5 Surge absorbers

A surge absorber is required for the electromagnetic brake. Use the following surge absorber or equivalent. Insulate the wiring as shown in the diagram.

				Maximum rating						Static
Permissible circuit					Surge	Energy	Rated	Maximum		capacity	Varistor voltage
								limit voltage		(reference	rating (range) V1mA
voltage					immunity	immunity	power
										value)
AC[Vma]		DC[V]			[A]	[J]	[W]	[A]	[V]	[pF]	[V]
140	180				(Note)	5	0.4	25	360	300	220
					500/time						(198 to 242)
Note: 1 time		8	20 s

(Example) ERZV10D221 (Matsushita Electric Industry) TNR-10V221K (Nippon chemi-con)

Outline drawing [mm] ( [in] ) (ERZ-C10DK221)

13.5 (0.53) 4.7 1.0 (0.190.04)

16.5 (0.65)

0.8 (0.03) 3.0(0.12) orless (1.18)30.0 moreor

Vinyl tube

Crimping terminal for M4 screw

14.2.6 Noise reduction techniques

Noises are classified into external noises which enter the servo amplifier to cause it to malfunction and those radiated by the servo amplifier to cause peripheral devices to malfunction. Since the servo amplifier is an electronic device which handles small signals, the following general noise reduction techniques are required.

Also, the servo amplifier can be a source of noise as its outputs are chopped by high carrier frequencies. If peripheral devices malfunction due to noises produced by the servo amplifier, noise suppression measures must be taken. The measures will vary slightly with the routes of noise transmission.

(1)Noise reduction techniques

(a) General reduction techniques

Avoid laying power lines (input and output cables) and signal cables side by side or do not bundle them together. Separate power lines from signal cables.

Use shielded, twisted pair cables for connection with the encoder and for control signal transmission, and connect the shield to the SD terminal.

Ground the servo amplifier, servo motor, etc. together at one point (refer to Section 3.10).

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