Relays; Surge Absorbers; Noise Reduction Techniques - Mitsubishi Electric Melservo-J2-SUPER series Instruction Manual

14. OPTIONS AND AUXILIARY EQUIPMENT

14.2.4 Relays

The following relays should be used with the interfaces:
Interface
Relay used for input signals (interface DI-1) signals
Relay used for digital output signals (interface DO-1)

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
Permissible circuit
voltage immunity
AC[Vma] DC[V]
140 180
500/time
Note: 1 time 8 20 s
(Example) ERZV10D221 (Matsushita Electric Industry)
TNR-10V221K (Nippon chemi-con)
Outline drawing [mm] ( [in] ) (ERZ-C10DK221)

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).
Surge Energy Rated
immunity power
[A] [J]
(Note)
5
13.5 (0.53)
0.8 (0.03)
To prevent defective contacts , use a relay for small signal
(twin contacts).
(Ex.) Omron : type G2A , MY
Small relay with 12VDC or 24VDC of 40mA or less
(Ex.) Omron : type MY
Maximum
limit voltage
[W] [A] [V]
0.4 25 360
4.7 1.0 (0.19 0.04)
14 - 33
Selection example
Static
capacity Varistor voltage
(reference rating (range) V1mA
value)
[pF] [V]
220
300
(198 to 242)
Vinyl tube
Crimping terminal
for M4 screw