Gorman-Rupp Pumps S3A1 460V 3P All serial numbers Control Box - Manual (Page 19)

CONTROL BOXES OM−05169
OPERATION PAGE C − 2
D The liquid level devices (optional equip-
ment) operate in conjunction with the 3-po-
sition switch (HAND-OFF-AUTO) supplied
as part of that option. After the level sensors
and circuitry have been installed, pump op-
eration may be automatically controlled for
filling or dewatering functions. In the HAND
position, the switch closes the circuit to per-
mit pump operation until the switch is
moved to the OFF position. In the OFF posi-
tion, the switch interrupts incoming power
through the control box and prevents pump
operation. In the AUTO position, sensors will
automatically turn the pump on or off de-
pending on the level of the liquid being
pumped.
Always terminate incoming power to the control
box before investigating control box circuitry prob-
lems.
Always terminate power to the control
box before performing service func-
tions.
Power through the control box may be terminated
by moving the tie handle to the OFF position, there-
by opening the circuit breakers. This stops the
pump, but does not terminate incoming power
through the field wiring connected to the control
box.