KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 4.00 to 4.xx - Manual (Page 26)

2-8 SERIES EL 071414
FIGURE 2-6. TYPICAL INTERCONNECTIONS
2.6.1 MAINS POWER
Mains power is connected at the rear panel of the Series EL Electronic Load (see Figure 2-4)
via the IEC 320-style recessed power inlet connector with integral fuse holder (see PAR. 2.3 for
mains power requirements).
It is recommended that the 1/4-inch bolt with wingnut and flat washers (supplied) at the top left
of the rear panel be connected to earth ground.
2.6.2 UNIT UNDER TEST (UUT) TO LOAD CONNECTION
WARNING!
Loose test connections between the UUT and the Series EL load can
lead to load instability, erratic operation and possible equipment
damage. In addition, loose connections or insufficiently sized
conductors can become very hot and cause burns.
2.6.2.1 POWER CONNECTIONS
Connections between the UUT and the Series EL Electronic Load are achieved via the (+) and
(–) LOAD terminals located on the rear panel.
The load is capable of drawing very high currents. Connections between the UUT and the load
should be of suitably large wire, sized to carry the maximum current. It is extremely important to
ensure all connections are tight and corrosion free. Regular inspection of these connections is
important. Inspection interval should be established based on frequency and type of use. Once
per week is recommended, however where cable movement or vibration is likely, more frequent
inspections are warranted.
Use two wrenches to tighten the 3/8 in. (5/16 in. for dual output models) Bolt/Nut on the bus
bars. these hardware items are brass and could shear if overtightened: recommended maxi-
mum torque is 20 lb-ft for the 3/8 in. hardware, 10 lb-ft for the 5/16 in. hardware used on dual
output models. The small resistance created by a loose joint can cause very destructive heating
(e.g., a 1 milliohm joint with a current of 400 Amperes generates 160 watts).