Welch Vacuum 2581B-50 WOB-L Pinston Pump - Manual (Page 6)

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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 corrected.
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.
DANGER
Improper installation of the grounding plug
can result in a risk of electrical shock.