12. OPTIONS AND AUXILIARY EQUIPMENT
12.2.4 Relays
The following relays should be used with the interfaces:
Interface | Selection example |
Relay used especially for switching | To prevent defective contacts , use a relay for small signal |
command and input command (interface | (twin contacts). |
| (Ex.) Omron : type G2A , MY |
Relay used for digital output signals (interface | Small relay with 12VDC or 24VDC of 40mA or less |
| (Ex.) Omron : type MY |
12.2.5 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.
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Permissible circuit |
| Surge |
| Energy | Rated | Maximum | capacity | Varistor voltage | |||
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| limit voltage | (reference | rating (range) V1mA | |||||||
voltage |
| immunity |
| immunity | power | ||||||
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AC[Vma] |
| DC[V] |
| [A] |
| [J] | [W] | [A] | [V] | [pF] | [V] |
140 | 180 |
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| 5 | 0.4 | 25 | 360 | 300 | 220 | |
| 500/time |
| (198 to 242) | ||||||||
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Note: 1 time |
| 8 20 s |
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(Example) ERZV10D221 (Matsushita Electric Industry)
Outline drawing [mm] ( [in] )
13.5 (0.53) | 4.7 | 1.0 (0.19 | 0.04) | |
| 16.5 | (0.65) |
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0.8 (0.03) | 3.0(0.12) | orless | 30.0(1.18) ormore |
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Vinyl tube
Crimping terminal for M4 screw
12.2.6 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 3.9).
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