Welch Vacuum 2567B-50 WOB-L Pinston Pump - Manual (Page 6)

6
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 available 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 Identifi cation Symbols:
Power Off Power On
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.
DANGER
Improper installation of the grounding plug can result in a risk of
electrical shock.
If repair or replacement of the cord or plug is necessary, do not connect the grounding wire to
either fl at 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 qualifi ed 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 fi t the outlet, have
the proper outlet installed by a qualifi ed electrician.