Gorman-Rupp Pumps SM4G1-X30 460/3 1002211 thru 1241783 - Manual (Page 23)

SM SERIES OM−04417
OPERATION PAGE C − 3
or thermal protection, or if the pump is operated
against a closed discharge valve for an extended
period of time.
Never start the pump more than 6 times per
hour. If the pump motor does not cool be-
tween starts, it will over-heat, possibly re-
sulting in damage to the motor windings.
Checking Pump Rotation
Do not open the control box in an explo-
sive atmosphere. When sealed, the con-
trol box is explosion proof to prevent the
ignition of combustible gases. Opening
the box in an explosive atmosphere
could result in fire or explosion.
Check the direction of pump rotation before opera-
tion to ensure that the impeller is rotating in the cor-
rect direction.
Secure the pump during rotation to pre-
vent coiling of the power cable.
Suspend the pump from the lifting device fitted on
the pump. Apply power briefly and note the direc-
tion of pump kickback. As viewed from the top, the
pump should kick in a counterclockwise direc-
tion; this will indicate that impeller rotation is cor-
rect.
If the pump kicks in a clockwise direction, impeller
rotation is incorrect. Since the pump is powered by
a three-phase motor, have a qualified electrician in-
terchange the control box connections of any two
pump motor power leads. Re-check pump kick-
back; it should now be in a counterclockwise direc-
tion.
The electrical power used to operate
this pump is high enough to cause inju-
ry or death. Make certain that incoming
power is off and locked out before inter-
changing motor leads.
DIRECTION OF
AT STARTUP
KICKBACK
Figure C-1. Checking Pump Rotation
STARTING, STOPPING, AND
OPERATIONAL CHECKS
Starting
Do not attempt to operate the pump until
impeller rotation has been checked; im-
proper rotation will affect pump perform-
ance and may damage the pump.
Follow the instructions accompanying the control
box, start the pump, and run any recommended
checks.
Never start the pump more than 6 times per