Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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10 CHARACTERISTICS
10.2 Power supply capacity and generated loss
317
10
*1 The power supply equipment capacity changes with the power supply impedance. This value is applicable when the power factor
improving AC reactor or power factor improving DC reactor are not used.
*2 Heat generated during regeneration is not included in the servo amplifier-generated heat. To calculate heat generated by the
regenerative option, refer to the following.

Page 335 Regenerative options
*3 This value is applicable when the servo amplifier is cooled by using the panel through attachment.
Heat dissipation area for an enclosed type cabinet
The enclosed type cabinet (hereafter called the cabinet) which will contain the servo amplifier should be designed to ensure
that its temperature rise is 10

at the ambient temperature of 40

. (With an approximately 5

safety margin, the
system should operate within a maximum 55

limit.) The necessary cabinet heat dissipation area can be calculated by
equation 10.1.
A: Heat dissipation area [m
2
]
P: Loss generated in the cabinet [W]

T: Difference between internal and ambient temperatures [

]
K: Heat dissipation coefficient [5 to 6]
When calculating the heat dissipation area with equation 10.1, assume that P is the sum of all losses generated in the cabinet.
Refer to the following for heat generated by the servo amplifier.
 Page 315 Amount of heat generated by the servo amplifier
"A" indicates the effective area for heat dissipation, but if the cabinet is directly installed on an insulated wall, that extra
amount must be added to the cabinet's surface area. The required heat dissipation area will vary with the conditions in the
cabinet. If convection in the cabinet is poor and heat builds up, effective heat dissipation will not be possible. Therefore,
arrangement of the equipment in the cabinet and the use of a cooling fan should be considered. The following section lists the
cabinet dissipation area for each servo amplifier (guideline) when the servo amplifier is operated at the ambient temperature
of 40
 under rated load.

Page 315 Amount of heat generated by the servo amplifier
When air flows along the outer wall of the cabinet, effective heat exchange will be possible, because the temperature slope
inside and outside the cabinet will be steeper.
MR-J4-10GF1(-RJ) HG-MR053 0.3 25

15 0.5
HG-MR13 0.3 25 15 0.5
HG-KR053 0.3 25 15 0.5
HG-KR13 0.3 25 15 0.5
MR-J4-20GF1(-RJ) HG-MR23 0.5 25 15 0.5
HG-KR23 0.5 25 15 0.5
MR-J4-40GF1(-RJ) HG-MR43 0.9 35 15 0.7
HG-KR43 0.9 35 15 0.7
Servo amplifier Servo motor Power supply
capacity [kVA]
*1
Servo amplifier-generated heat [W]
*2
Area required
for heat
dissipation [m
2
]
At rated output At rated output
[Generated
heat in the
cabinet when
cooled outside
the cabinet]
*3
With servo-off
K • Δ T
P
A =
·········(10.1)
(Outside the cabinet) (Inside the cabinet)
Air flow