Lakeshore Learning Materials 642 - Manual (Page 40)

Lake Shore Model 642 Electromagnet Power Supply User’s Manual
3-12 Installation
3.12 DETACHABLE HANDLES
The Model 642 is supplied with 4 detachable handles to enable handling. The handles should normally remain attached
to the unit. However, in some cases it may be necessary to remove the handles to enable mounting in an equipment rack.
In this case, handles may be removed but they should be stored in the rack with the power supply so that they may be
reattached if the unit must be returned for service. Heavy duty handles have been installed to carry the weight of the
power supply. No substitutions should be made. Light duty handles may fail when moving the supply causing the risk of
injury to personnel and damage to equipment.
3.13 RACK MOUNTING
The Model 642 can be installed in a standard 19-inch rack mount cabinet and requires 311 mm (12.25 in) (7U) in height.
At least 25 mm (1 in) of space should be provided on each side for cross ventilation. No ventilation panels are required
above or below the unit. Due to the weight of the power supply, it is recommended that the supply be located at the
bottom of the rack and that it rest on the bottom panel of the rack. If the rack does not have a bottom panel, a shelf,
capable of supporting 74 kg (163 lb) must be provided. Light duty support rails, which bolt to the sides of the front and
rear mounting rails of the rack are not strong enough to support this unit.
In addition, if the equipment rack which houses the Model 642 is to be shipped, the Model 642 must be anchored to the
shelf. Threaded inserts are provided in the bottom of the Model 642 for this purpose. Four (4) ¼-20 × ½ in bolts (not
included) are required. The hole pattern for mounting is shown in Figure 3.16.
CAUTION: The front panel rack mount is to be used only to secure the power supply to the front of the rack.
The bottom of the rack or the equipment shelf must support the entire weight of the supply. Do NOT
attempt to support the supply from the front mounting holes alone.
Figure 3-16. Mounting Hole Pattern