ElmoMC SimplIQ Digital Servo Drives-Drum HV - Manual (Page 63)

Drum HV (High Voltage) Installation Guide Installation
MAN-DRU-HVIG (Ver. 1.602)
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3.6. Powering Up
After the Drum HV (High Voltage) has been mounted, check that the cables are intact.
The Drum HV (High Voltage) servo drive is then ready to be powered up.
Caution:
Before applying power, ensure that the DC supply is within the range specified
for your specific type of Drum HV (High Voltage) and that the proper plus-
minus connections are in order.
3.7. 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 heat
sink.
When “Free Air Convection” is sufficient for the application it is recommended to leave
approximately 10 mm of space between the Drum's heat sink and any other assembly.
3.7.1. Drum HV Thermal Data
• Free air convection thermal resistance (θ): Approximately 7 to 8°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 40 minutes).
• Self-heat dissipation capability (no external heat sink): 20 W for 40°C/W temperature rise.
• Shut-off temperature: 86 to 88°C (measured on the heat sink).
• The thermal resistance when connecting to an external heat sink using a thermal
conductive compound/foil. By proper smearing of the surface a significant improvement of
the thermal resistance is achieved: 0.06°C/W.