INSTALLATION
WARNING
ELECTRIC SHOCK can kill.
•Turn the input power off at the disconnect switch before installing or servicing this machine.
•Do not touch electrically “hot” parts such as output terminals or internal wiring.
•Connect grounding screw 
to a good earth ground.
•Do not operate with covers removed.
•Turn power switch “OFF” before connecting or disconnecting cables or other equipment.
•Only qualified personnel should install or service this equipment.
Please read all of this section before starting installation. Refer to Figure 1 during installation.
Location
Place the welder where clean cooling air can freely circulate in through the front louvers, and out through the rear louvers. The presence of dirt, dust or any foreign material that can be drawn in through the louvers should be kept to a minimum. Failure to observe these precautions can result in excessive operating temperatures, and welder shutdowns due to thermal overload.
Minimizing Problems Due to High Frequency
This welder, like all electrical equipment, can be subject to interference from strong sources of high frequency energy. Sources of high frequency energy include, but are not limited to, TIG welders, plasma cutters, and
Input Connections
Be sure the voltage, phase and frequency of the input power is as specified on the rating plate. The rating plate is located on the front control panel of the DC- 650 PRO.
An entry for the input power lines (#1, Fig. 1) is provided on the case back. The knockout is 2.00” (51
mm)in diameter. Access to the input panel connection area is gained by removing the two bolts which secure the Reconnect Door (#2, Fig. 1) and lifting the door upward.
Select the input lead wire sized according to local and national electrical codes. A chart conforming to the U.S. National Electrical Code is provided as a reference. (Table 1). Have a qualified electrician connect the input leads to terminals L1, L2 and L3 on the reconnect panel (#3, Fig. 1), in accordance with all local and national electrical codes, and with the diagram (#4, Fig. 1) located on the inside of the cover. Use a three phase line.
The frame of the welder must be grounded. A ground terminal (#5, Fig. 1) marked with the symbol 
is located on the bottom of the input box for this purpose. Check local and national electrical codes for details on proper grounding methods.
On welders with multiple input voltages, be sure that the reconnect panel is connected per the instructions that follow.
CAUTION
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN CAUSE IMMEDIATE FAILURE OF COMPONENTS INSIDE THE WELDER.
Welders are shipped connected for the highest rated input voltage. To change this to a lower voltage, first reconnect the pilot transformer leads H2, H3 or H4 per the diagram attached to the inside of the reconnect door. Next, remove and reinstall the reconnect links according to the same diagram.
Fuse the input leads with the recommended size super lag fuses or delay type circuit breakers. See Table 1 for the recommended fuse and/or circuit breaker sizes. Using fuses or breakers smaller than those recommended may result in nuisance “tripping”, and possible damage to circuit breakers from welder inrush currents at turn on, even if the machine is not used to weld at high currents.
Dec 95 | – 8 – |