5. Connections
5
−
15
5.6 Relation to the main circuit
5.6.1 Selection of the main circuit wire, no-fuse breaker and electromagnetic contactor
Select and prepare the main circuit wire, breaker and electromagnetic contactor for the power/motor
from the following table according to the spindle amplifier capacity.
Wire (mm
2
) (Note 1)
Amplifier model
Power supply
equipment
(kVA)
No-fuse
breaker
Electro-m
agnetic
contactor
L1,L2,L3
L11,L21 U,V,W
P,C
(Note 2)
MDS-B-SPJ2-02 0.5
NF30-type 5A
S-N10
(S-K10)
MDS-B-SPJ2-04 1.0
MDS-B-SPJ2-075 2.0
NF30-type 10A
S-N11
(S-K11)
2
MDS-B-SPJ2-15 3.0
NF30-type 15A
2
MDS-B-SPJ2-22 4.0
NF30-type 20A
S-N18
(S-K18)
2
MDS-B-SPJ2-37 7.0
NF30-type 30A
MDS-B-SPJ2-55 9.0
NF50-type 40A
3.5
3.5
MDS-B-SPJ2-75 12.0
NF50-type 40A
S-N25
(S-K25)
5.5 5.5
MDS-B-SPJ2-110
MDS-B-SPJ2-110C
17.0
NF50-type 50A
S-N35
(S-K35)
14
1.25
8
3.5
(Note 1)
The standard wire is a 600V vinyl wire. The wires (U, V, W) in the table are for a distance of 30m or
less between spindle motor and spindle amplifier.
The recommended wire sizes are those selected under conditions corresponding to the power capacity
(short-time rating), when all three wires have the same sensitivity and the ambient temperature is 30
°
C.
Determine the wire size matching the actual ambient temperature, ambient humidity, wire and wiring
status by conversion, using the table above as a reference.
(Note 2)
Wire with a twisted regenerative resistor (P, C) connection wire.
5.6.2 Input/output DIO relay
Use the following relays for the input/output interface (contactor output: MC, etc.)
Interface name
Selection example
Relay used to turn the digital input signal
ON/OFF
Use for minute signals to prevent faulty contacts
(twin contacts).
< Example >
OMRON: G2A, MY
Relay used for digital output signals (MBR,
MC)
Compact relay of 40mA or less for 12 VDC or
24VDC.
< Example >
OMRON: MY
