Selecting An External Heatsink (Finless Drive) - YASKAWA T1000V Technical Manual

No.
H4-01 Analog Output Terminal AM Function Selection
H4-02 Analog Output Terminal AM Gain
H4-03 Analog Output Terminal AM Bias
Figure 2.5
Note: 1. Accuracy of the temperature reading between 50ºC and 100ºC may vary ±5ºC.
2. The heatsink temperature is affected by the ambient temperature. Never exceed the allowable maximum heatsink plate temperature.
■ Drive Overheat Alarm (oH)
Set L8-02 to have the drive output an alarm when the heatsink plate exceeds a specified temperature.
L8-03 determines the action taken by the drive when an oH alarm is triggered. Refer to the T1000V Technical Manual for
more details.

◆ Selecting an External Heatsink (Finless Drive)

Data Required for Heatsink Selection
■
Table 2.13 shows the data needed to select a heatsink suitable for the drive and application.
Symbol
Drive heat loss
P
Loss
Refer to Drive Watt Loss Data on page 313
Maximum heatsink plate temperature
This is the temperature at the surface of the heatsink plate. It can be monitored with U4-08. The maximum allowable value
T
depends on drive model.
HSP_max
CIMR-TCBV
CIMR-TC2V0030 to 0069, CIMR-TC4V0018 to 0038: 80ºC
T
External heatsink ambient temperature (air temperature around heatsink)
Amb
Heatsink plate thermal resistance
Rθ
HSP
This value is 0.05 K/W
Thermal resistance between the heatsink plate and the external heatsink.
Calculated as
Rθ
HSP-EHS
A
th
λ
Comp
d
Comp
Rθ
Thermal resistance of the external heatsink
EHS
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Table 2.12 Parameter Settings
Name
Output Voltage V
10.0
9.0
5.0
0
Figure 2.5 Output of Heatsink Plate Temperature by Analog Output
Table 2.13 Data Required for Heatsink Selection
, CIMR-TC2V0001 to 0020, CIMR-TC4V0001 to 0011: 90ºC
d
Comp
Rθ =
λ
HSP-EHS
comp
Heat transfer area between drive heatsink plate and external heatsink.
Note: Due to uneven heat generation across the heatsink plate (by arrangement of internal components) the effective area for heat
transfer is lower than 70% of the heatsink plate area. This must be considered when calculating the thermal resistance.
Refer to Figure 2.6 for values of H and W to calculate the area of the heatsink plate.
Thermal conductivity of the heatsink thermal compound
Thickness of the thermal compound
Temperature （ °C）
50 90 100
Description
to check the amount of heat loss from the heatsink plate of the drive.
A
th
2.2 Mechanical Installation
Description
00408
(heatsink plate temperature)
100.0%
0.0%
2
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