KLN Series 022014 2-72. Separate the two units. Install two shoulder screws, flat washers and lockwashers (suppliedwith Kit) at two locations on one unit (two threaded holes, A, Figure 1-2).3. Move the two units together and insert the shoulder screws into the keyhole-shaped openingin the other unit (two holes, B, Figure 1-2). Then slide the unit without the shoulder screwsforward until the front panels of both units are flush.4. Connect the two units at the rear using linking bracket (see Figure 1-2, sheet 2) and twoscrews supplied with Kit. The two units can now be handled as an assembly and can beinstalled directly into a 19-inch rack.2.4.2 RACK MOUNTING 1500W MODELSKLN 1500W units can be mounted in a standard 19-inch rack using the Mounting Kit suppliedwith the unit (see Figure 1-3 for outline dimensions). Attach two knobs to the L-type bracketsusing two screws supplied in the kit. On each side of the unit, attach the two L-type bracketswith knobs to the unit using four screws supplied in the Kit. The units are 1U high and do notrequire any gaps between equipment above and below. Airflow is front to back only.2.4.3 RACK MOUNTING 3000W MODELSKLN 3000W units can be mounted in a standard 19-inch rack using the Mounting Kit suppliedwith the unit (see Figure 1-4 for outline dimensions). On each side of the unit, attach the two L-type brackets with handles to the unit using six screws supplied in the Kit. The units are 2U highand do not require any gaps between equipment above and below. Airflow is front to back only.Side support brackets (not supplied, see Table 1-5, Accessories) are recommended to supportthe weight of the unit.2.5 WIRING INSTRUCTIONSInterconnections between an a-c power source and a power supply, and between the powersupply and its load are as critical as the interface between other types of electronic equipment.If optimum performance is expected, certain rules for the interconnection of source, power sup-ply and load must be observed by the user. These rules are described in detail in the followingparagraphs.CAUTION: WHEN WORKING WITH ACTIVE LOADS, THE VOLTAGE OR CURRENT OFTHE ACTIVE LOAD MUST NOT EXCEED THE MAXIMUM VOLTAGE OR CUR-RENT RATING OF THE KLN. OTHERWISE THE OVERVOLTAGE OR OVER-CURRENT PROTECTION WILL SHUT DOWN THE POWER SUPPLY.2.5.1 SAFETY GROUNDINGTo minimize shock hazard, the product chassis must be connected to an electrical ground. Theproduct must be connected to the AC power supply mains through a three-conductor powercable, with the ground wire firmly connected to an electrical ground (safety ground) at the poweroutlet.Local, national and international safety rules dictate the grounding of the metal cover and caseof any instrument connected to the a-c power source, when such grounding is an intrinsic part ofthe safety aspect of the instrument. The ground terminal of the source power connector (Figure2-1) is connected to the chassis and the instructions below suggest wiring methods which com-ply with these safety requirements. In the event that the specific installation for the power sys-tem is different from the recommended wiring, it is the customer's responsibility to ensure that