4.1.3 Power Requirements
The HD25 requires regulated 24VDC (+/-XXX) for operation. The average power draw of the HD25
is 10W to 15W, but up to 75W is required to accommodate momentary higher currents required
during pan and tilt accelerations. Therefore, a 24VDC, 3A power supply is recommended. Trillium
manufactures a standalone 24VDCout, 3A power supply with an output power enable line, refer to
section: 9.1 External Power Regulators, for more information on power regulator options.
4.1.4 Thermal Management
Since very little mechanical work is done by the gimbal, approximately 10W of thermal power must
be rejected. Primary heat sources are thermally bonded to the exterior magnesium housings
located at the base of the payload, the base of the clevis, and the base and top of the crown. When
mounting the gimbal, these areas should have access to free air flow; do not encase in foam or any
other thermally insulating material. If the gimbal is installed in an enclosed area without access to
airflow, a fan should be provided for cooling the gimbal.
5 HD40 Hardware Interfaces
5.1.1 Mounting Provisions
Dimensions and mounting provisions for the gimbal are shown below. Two holes tapped for
M3x0.5 are located on each side of the crown. All four holes should be used when interfacing to the
gimbal. When mounting the gimbal, care should be taken to ensure both the pan and tilt stages are
free to move; if either stage is rubbing against an interfacing part, stabilization performance will be
degraded and motors could overheat, causing permanent damage to the gimbal. The figure also
shows the approximate Cg location for the gimbal which may vary slightly between payload
configurations.
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