Overload Protection; Extension Cords - Welch 2560 Owner's Manual

2.20 Electrical Power
2.21 Power Source Review
Review the power source and the voltage rating on the units serial number tag to be sure they agree in voltage,
phase and frequency. Serious damage may occur to the system if it is connected to an improper voltage. All
Welch systems must be grounded. Grounding reduces the risk of electric shock in the event of an electrical
short circuit. The plug must be plugged into an outlet properly grounded. Consult your local electrical codes
if you have doubts.
2.22

Overload Protection

The motor manufacturer makes motor thermal overload protection availeble as an aid to minimize motor
failure. Overload protection is a standard feature on both 50/60Hz single-phase motors. The motors have
automatic overload protection. Automatic reset protection is designed to reset itself after a predetermined
cooling period. If the fault to the drive remains unaltered, the motor will cycle on and off until fault is cor-
rected.
2.23 Identification Symbols
2.24 Grounding Instructions
This product should be grounded. In the event of an electrical short circuit, grounding reduces the risk of
electric shock by providing an escape wire for the electric current. This product is equipped with a cord
having a grounding wire with a grounding plug. The plug must be plugged into an outlet that is properly
installed and grounded in accordance with all local codes and ordinances.
This adapter shown in Figure B and Figure C is not acceptable in Canada.
If repair or replacement of the cord or plug is necessary, do not connect the grounding wire to either flat blade
terminal. The wire with insulation having an outer surface that is green with or without yellow stripes is the
grounding wire.
Check with a qualified electrician or serviceman if the grounding instructions are not completely understood, or if
in doubt as to whether the product is properly grounded. Do not modify the plug provided; if it will not fit the
outlet, have the proper outlet installed by a qualified electrician.
This product is for use on a nominal 120V circuit, and has a grounding plug that looks like the plug illustrated in
Sketch A in Figure #1. A temporary adapter, which looks like the adapter illustrated in sketches Band C, may be
used to connect this plug to a 2-pole receptacle as shown in sketch B if a properly grounded outlet is not available.
The temporary adapter should be used only until a properly grounded outlet (Sketch A) can be installed by a
qualified electrician. The green colored rigid ear, lug, etc. extending from the adapter must be connected to a
permanent ground such as a properly grounded outlet box cover. Whenever the adapter is used, it must be held in
place by a metal screw.
2.25

Extension Cords

If necessary to use an extension cord, use a 3-wire extension cord that has a 3-blade grounding plug, and a 3-
slot receptacle that will accept the plug on the product. Make certain your extension cord is in good
condition. Make certain your extension cord wire size is not less than 18 gauge for 25 feet, 16 gauge for 50
feet, and 14 gauge for 100 feet. An undersized cord will cause a drop in line voltage resulting in loss of
power and overheating. If in doubt, use the next heavier cord. The smaller the gauge number, the heavier the
cord.
6
DANGER
Improper installation of the grounding plug
can result in a risk of electrical shock.