Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual page 26

The spindle motor rotation energy W is :
n
W =
120 ×
GD
M
2
GD
L
N
n
60
n =
T
2.3.3 Combination of regenerative resistor capacity and unit
The combinations of the regenerative resistor capacity (tolerable heating value) and the unit are
shown below.
Model
No regenerative
resistor
FCUA-RB04
FCUA-RB075
FCUA-RB15
FCUA-RB22
FCUA-RB37
FCUA-RB75/2
1 unit used
FCUA-RB55
FCUA-RB75/2
Two units in series
R-UNIT1
R-UNIT2
R-UNIT3
R-UNIT4
R-UNIT5
If repeated frequency operation exceeding the regenerative resistor capacity is carried
out, and over-regeneration alarm will occur and the spindle drive unit will stop.
The over-regeneration alarm detects the cumulative value of the current that flows within
a set time to the regenerative resistor. The alarm can be released just by turning the
power ON again, but do not resume operation immediately.
If operation is resumed before the regenerative resistor cools, the regenerative resistor
could burn out and fires could occur. Always resume operation after the regenerative
resistor cools.
2. Specifications
2 2
( GD + GD )
M L
4
2
: Motor rotor inertia
: Motor shaft conversion load inertia
: Motor speed
: Acceleration/deceleration frequency (times/min.)
T : Tolerable duty cycle
Tolerable Resistance
heating value
value (ohm)
— —
60W 200
80W 100
120W 60
155W 40
185W 25
340W 30
340W 20
680W 15
700W 15
700W 15
2100W 15
2100W 10
3100W 10
2π • N
2
× [ ]
60
(kg•m
(kg•m
(r/min)
(sec)
Combination with spindle drive unit
-02 -04 -075 -15
2 − 5
2
)
2
)
(MDS-B-SPJ2-**)
-22 -37 -55 -75 -110