3.2. Cabinet Installation
The MT Series MagnaDC power supply ships as a self-contained floor-standing cabinet and requires no rack or external enclosure. 150 kW models are supplied in a double-bay 19 inch cabinet on six (6) locking casters; 250 kW models are supplied in a triple-bay cabinet on eight (8) locking casters. Refer to Product Diagrams for cabinet dimensions and to the Physical Specifications for shipping weights.
The unit must be operated in the upright position. Because the cabinet is top-heavy and weighs between 2100 lbs (952.5 kg) and 3300 lbs (1496.9 kg), move it only on a level surface, and follow the uncrating instructions sheet included with the shipment when removing the cabinet from its pallet.
Once the cabinet is in its final position, lock all casters. For permanent installations, a floor-mountable pedestal base is available as the Pedestal Base (+PB) option, which replaces the standard casters with a platform base that can be bolted to the floor.
Electrical connections are made through the rear access panel. Power and control cables must be kept separate: run them in independent conduits and feed them through dedicated holes punched in the access panel. Routing control wiring alongside the AC input or DC output conductors can couple switching noise into the analog programming and monitoring signals.
3.2.1. Cooling Requirements
Each cabinet is cooled by internal blowers that draw fresh air in at the front and rear and exhaust warm air through the top. No external fans are required. The MT Series is rated for continuous full-power operation in ambient temperatures up to 50 °C.
Caution
Blocking ventilation will cause the power supply to overheat and trip the thermal (THL) diagnostic. Do not obstruct the front or rear intakes at the base of the cabinet, and leave the top exhaust clear. Allow a minimum of 2 in (5.1 cm) clearance at the sides and rear of the cabinet, and do not place the cabinet beneath a low overhang or shelf that would restrict the top exhaust.
The room or enclosure housing the MT Series must be able to remove the heat the supply rejects at full load. The following table gives the maximum heat rejected to ambient at each power level, calculated from the maximum rated output power and the lowest published efficiency for that power level.
Note
The values above are for a single cabinet operating at full rated output. For master-slave systems, multiply by the number of cabinets. A 1000 kW system built from four 250 kW cabinets rejects approximately 99 kW, or 338 kBTU/hr, into the installation.