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

10. CHARACTERISTICS

10.2 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 servo motors
and the capacities of the servo 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 servo 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 10.1 and 10.2.
Calculate the power supply capacity with equation 10.1 below.
Power supply capacity [kVA] = Sum of power supply capacity (A) of the connected servo motors ·· (10.1)
For example, when a HG-KR43, HG-KR23, and HG-KR053 are connected to an MR-J4W3-444B servo
amplifier, according to table 10.1, the power supply capacity of each servo motor is as follows: HG-KR43
= 0.9 [kVA], HG-KR23 = 0.5 [kVA], HG-KR053 = 0.3 [kVA]. Calculate the values with equation 10.1.
Power supply capacity [kVA] = 0.9 + 0.5 + 0.3 = 1.7
Under the above conditions, the power supply capacity of the servo amplifier is 1.7 [kVA].
Table 10.1 Power supply capacity for
one servo amplifier at rated output
Servo amplifier
Power supply capacity
MR-J4W2-22B
MR-J4W2-44B
Total power supply
MR-J4W2-77B
capacity of connected
servo motors ((A) in
MR-J4W2-1010B
table 10.2)
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.
Table 10.2 Servo amplifier power
supply capacity for one servo motor
(Note)
Servo motor
[kVA]
HG-KR053
HG-MR053
HG-SR102
HG-JR103
10 - 2
Power supply capacity
[kVA]
(A)
0.3
HG-KR13 0.3
HG-KR23 0.5
HG-KR43 0.9
HG-KR73 1.3
0.3
HG-MR13 0.3
HG-MR23 0.5
HG-MR43 0.9
HG-MR73 1.3
HG-SR51 1.0
HG-SR81 1.5
HG-SR52 1.0
1.7
HG-UR72 1.3
HG-JR53 1.0
HG-JR73 1.3
1.7