Gorman-Rupp Pumps SF4C 1528832 and up - Manual (Page 18)

SF SERIES OM-06511
PAGE C - 5 OPERATION
between starts, it will over‐heat, resulting in
damage to the motor windings.
Stopping
Follow the instructions accompanying the control
box for stopping the pump.
The integral thermal overload device
will shut off the motor if the temperature
rises above design limits. When the
pump cools and the temperature falls
below these limits, the motor will restart
automatically. To avoid the hazards of
an unexpected motor start‐up, do not at­
tempt to handle or service the pump un­
less all power to the motor has been
shut off and locked out at the control
box; otherwise, serious personal injury
could result.
During motor shutoff by the thermal
overload device, control box circuits re­
main live. Do not attempt to service any
control box components unless incom­
ing power has been shut off.
To stop the pump, turn the control handle OFF,
thereby opening the circuit breakers. This does
not terminate incoming power through the field
wiring connected to the control box.
After stopping the pump, be sure to perform all re­
quired maintenance and preservation procedures.
Operational Checks
To detect minor problems, check the pump for
proper operation when it is first started, and at peri­
odic intervals during operation.
To avoid serious damage to the pump,
check for unusual noises or excessive vi­
bration while the pump is running. If noise
or vibration is excessive, stop operation
and refer to the troubleshooting chart in the
maintenance and repair manual.
The suction inlet or impeller may become clogged
with debris. In some cases, stopping the pump
momentarily may backflush this blockage. If back­
flushing does not clear the debris, remove the
pump from the sump or wet well and clear manu­
ally.
Never introduce air or steam pressure
into the pump casing to remove a block­
age. This could result in personal injury
or damage to the equipment. If back­
flushing is absolutely necessary, limit
liquid pressure input to 50% of the maxi­
mum permissible operating pressure
shown in the pump performance curve.
Check the pump for overheating. Overheating can
occur if the pump is misapplied, required to start
repeatedly, if the control box fails to provide over­
load or thermal protection, or if the pump is oper­
ated against a closed discharge valve for an ex­
tended period of time.
Do not start the pump more than 10 times
per hour. If the motor does not cool be­
tween starts it will overheat, resulting in
damage to the motor windings.