Gorman-Rupp Pumps S3A1 460V 3P All serial numbers Control Box - Manual (Page 18)

CONTROL BOXES OM−05169
OPERATION PAGE C − 1
OPERATION − SECTION C
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and
decals attached to the control box.
The electrical power used to operate
this control box is high enough to cause
injury or death. Make certain that the tie
handle in the control box is in the OFF
position and locked out, or that the pow-
er supply to the control box has been
otherwise cut off and locked out, before
attempting to open or service the con-
trol box. Tag electrical circuits to pre-
vent accidental start-up.
Obtain the services of a qualified elec-
trician to make all electrical connec-
tions, and to troubleshoot, test and/or
service the electrical components of the
control box.
CONTROL BOX FUNCTION
The control box is not designed to be ex-
plosion-proof. Do not operate in an ex-
plosive atmosphere.
The control box is provided to facilitate operation of
the pump. It contains controls for starting and stop-
ping the pump, and provides overload protection
for the pump motor. The pump control may be
equipped with an optional automatic liquid level
sensing device, in which case the circuits are also
contained within the control box.
The control box provides overload pro-
tection and power control. Do not con-
nect the pump motor directly to the in-
coming power lines.
Since operation of the pump motor is de-
pendent upon the quality and performance
of the electrical controls, the pump warran-
ty is valid only when controls have been
specified or provided by The Gorman-
Rupp Company.
Component Function
The control box contains the following hand-oper-
ated switches and controls:
D The tie handle operates the control box cir-
cuit breakers. In the OFF position, the tie
handle opens the circuit breakers to inter-
rupt incoming power through the control
box and prevent pump operation. In the ON
position, it closes the circuit breakers to per-
mit pump operation. The circuit breakers will
open or trip" automatically in the event of a
short circuit overload current. When tripped,
move the tie handle to OFF and back to ON
to reset the circuit breakers.
D The overload unit is also the ON and OFF
switch. The overload relay will trip automati-
cally if the current drawn by the motor ex-
ceeds design specifications. Allow 10 sec-
onds for the unit to cool after tripping before
resetting.
NOTE
If the circuit breaker trips, do not reset it immedi-
ately. Wait at least ten minutes before resetting the
tie handle back to the ON position. If the overload
unit continues to trip, operational problems exist.