Power Supply Capacity And Generated Loss - Mitsubishi Electric MR-J4W2-0303B6 Instruction Manual

15. USING A DIRECT DRIVE MOTOR

15.4.2 Power supply capacity and generated loss

Calculate the generated loss and the power supply capacity of the servo amplifier under rated load from (1)
and (2) in this section. The calculated value will vary depending on the number of connected direct drive
motors and the capacities of the direct drive motors. For thermal design of an enclosed type cabinet, use the
values calculated in consideration for the worst operating conditions. The actual amount of generated heat
will be intermediate between values at rated torque and servo-off according to the duty used during
operation. When the direct drive motor is run at less than the rated speed, the power supply capacity will be
smaller than the calculated value, but the servo amplifier's generated heat will not change.
(1) Calculation method of power supply capacity
Calculate the power supply capacity for one servo amplifier from tables 15.1 and 15.2.
Calculate the power supply capacity with equation 10.1 in (1) in section 10.2.
Table 15.1 Power supply capacity for
one servo amplifier at rated output
Power supply capacity
Servo amplifier
MR-J4W2-22B
MR-J4W2-44B
Total power supply
MR-J4W2-77B
capacity of connected
direct drive motors ((A)
MR-J4W2-1010B
in table 15.2)
MR-J4W3-222B
MR-J4W3-444B
Note. The power supply capacity will vary
according to the power supply impedance.
This value is applicable when the power
factor improving reactor is not used.
supply capacity for one direct drive
[kVA] (Note)
TM-RFM002C20
TM-RFM004C20
TM-RFM006C20
TM-RFM006E20
TM-RFM012E20
TM-RFM018E20
TM-RFM012G20
TM-RFM040J10
TM-RG2M002C30
TM-RU2M002C30
TM-RG2M004E30
TM-RU2M004E30
TM-RG2M009G30
TM-RU2M009G30
Note. The value inside ( ) applies when the torque
15 - 19
Table 15.2 Servo amplifier power
motor
Power supply capacity
Servo motor
[kVA] (A) (Note)
0.5 (0.7)
0.5 (0.7)
is increased.
0.25
0.38
0.53
0.46
0.81
1.3
0.71
1.2
0.25
0.25
0.9
0.9