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3.6 Heat Dissipation
For full power output capability the Drum is designed to be mounted on an external heatsink.
It is highly recommended that the “Wall” on which the Drum is mounted will have heat
dissipation capabilities. The Drum at “free air convection” (without an additional heatsink)
can dissipate around 12 W for 40 °C ambient temperature and not exceeding 80 °C on the
heatsink.
When “Free Air Convection” is sufficient for the application it is recommended to leave
approximately 10 mm of space between the Drum's heatsink and any other assembly.
3.6.1 Drum Thermal Data
• Free air convection thermal resistance (θ): Approximately 3.6 – 4 °C/W.
• Thermal time constant: Approximately 40 minutes/ 2400 seconds (thermal time
constant means that the Drum will reach 2/3 of its final temperature after 4 minutes).
• Self heat dissipation capability (no external heatsink): 12W for 40 °C/W temperature
rise.
• Shut-off temperature: 86 °C – 88 °C (measured on the heatsink).
• The thermal resistance when connecting to an external heat sink:
o The surface of the external heatsink is 50um: 0.18 °C/W.
o Thermal conductive compound. By proper Smearing of the surface a
significant improvement of the thermal resistance is achieved: 0.13 °C/W
3.6.2 Heat Dissipation Data
Heat Dissipation is shown in graphically below:
Power Dissipation 60V series
0
10
20
30
40
50
60
70
80
90
100
0 122030405060708090
Motor's Current (Ampere)
Power Dissipation (W)
12VDC
20VDC
30VDC
40VDC
50VDC
56VDC
Sta
n
da
r
d
4
0
°
°°
°
C
Am
b
i
e
n
t
T
e
m
p
.
Heatsink
Required
Heatsink
not
Required
Drum Installation Guide Installation
MAN-DRUIG (Ver. 1.0)
3-46