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2: Hardware Assembly
Isolation Transformer
Inside the gantry are a power supply, isolation transformer, and actuator motor (for
moving the dome vertically).
Both the power supply and actuator motor plug into the isolation transformer, which
plugs into mains supply. The purpose of the isolation transformer is to provide
isolation from ground for all components plugged into it. As a result, if a person
inadvertently comes into contact with these components and an electrical potential,
the transformer will prevent a current flowing from these components through the
person’s body to ground.
The isolation transformer is an international medical/hospital-grade unit from Toroid
Corporation of Maryland. The transformer is fused for 3.15 AT (120 V) or 1.6 AT
(240 V); its capacity is 300 VA max. For fuse replacement instructions, refer to the
transformer operating instructions.
Table 2-9 lists the transformer’s specifications. Table 2-10 lists the power consumption
values for the GPS.
Table 2-9. Isolation transformer specifications
50
Fuse rating
3.15 AT (120 V) or 1.6 AT (240 V)
Capacity
300 VA max
Compliance
UL2601.1,CSA C22.2 No. 601.1, EN60601-1,EN60742,
IEC601-1, CE Mark
Power
Selectable, 115 or 230 V 50-60 Hz, input/output
Leakage current
<100 µA
Outlets
Appliance type (IEC 60320)
Miscellaneous
Low weight, magnetic strayfield, mechanical noise, and losses;
high efficiency
Geodesic Photogrammetry System Technical Manual
S-MAN-200-GPSR-001 • November 22, 2006