5. Connections
5
−
14
5.5 Regenerative resistor connection
CAUTION
The regeneration option and servo amplifier cannot be set except as the designated combination.
Failure to observe this could result in fires, so always use the correct combination.
A regenerative resistor must be connected to the spindle drive unit.
Connect the regenerative resistor between the C and P terminals of the spindle drive unit.
Regenerative resistor
(
FCUA-RB□□)
Spindle drive unit
MDS-B-SPJ2
D
R1
R1
AL
1
AL
2
AC
1
AC
2
Regenerative resistor unit
(R-UNIT-□□)
Wire the cooling fan power supply.
(200VAC)
Thermal terminal
P C
or
CAUTION
The regenerative resistor type differs according to the motor capacity,
load GD2, and frequency of regeneration. Always confirm that the
regenerative resistor is the selected type before connecting. The unit
could be damaged if it is operated with the incorrect resistor connected.
!
DANGER
Depending on the frequency of use, the regenerative resistor main unit
may generate heat of 300deg or more. Never install the regenerative
resistor directly on any surface susceptible to heat.
CAUTION
Always wire the regenerative resistor using twisted
wire. When using a relay wire, keep the length as
short as possible (5m or less).
!
DANGER
Use a noncombustible wire for the relay wire, and
wire so that the regenerative resistor is not
contacted.
(Note)
Make sure that the input power is
shut OFF when the thermal relay
functions (when a fault occurs) to
protect the regenerative resistor
from overheating.
∗
The contact turns OFF when
abnormal overheating occurs.
Wire size selection table
Wire
(mm
2
)
Model
P, C
Spindle amplifier terminal
block screw sized
MDS-B-SPJ2-02
2
MDS-B-SPJ2-04
2
MDS-B-SPJ2-075
2
Refer to section 5.2.3.
MDS-B-SPJ2-15
3.5
MDS-B-SPJ2-22
3.5
MDS-B-SPJ2-37
3.5
M4 D
≤
8mm
2
MDS-B-SPJ2-55
3.5
MDS-B-SPJ2-75
3.5
M4 D
≤
9.6mm
2
MDS-B-SPJ2-110
/110C
3.5
M4 D
≤
9.6mm
2