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Pumps
Tanks Motors & Switches
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 The
Cycle Sensor is a system monitor that detects
Rapid Cycle and Dry Run and reacts to either
of these conditions by shutting down the pump. It does not
control or prevent rapid cycle or dry run but protects your
pump in the event these problems occur. This sensor was designed
for a pump that is controlled with a Pump Control Valve
such as a Cycle Stop valve and/or is installed with enough
pressure tanks to prevent a rapid cycle condition. The pump
must also be supplied with enough fluid to prevent dry run
which causes the undercurrent condition.
These units continuously display the load characteristics
of the motor when it is running. When a fault is detected,
the relay will shut off power to the pump and display RCYCL
for Rapid Cycle or DRY for a Low Current condition. The unit
can be reset by pressing the manual reset button or by shutting
off power to the unit and then powering back on.
The "Rapid Cycle" feature of this relay monitors
the duration of time the pump is on. If the pump "run
time" is shorter than the Cycle Sensor minimum set time,
the pump will be shut down before damage from cycling
occurs. Length of acceptable minimum pump run time is adjustable
and can be set for as little as 0 seconds to as much as 600
seconds. (Rapid cycling can be caused by water logged or improperly
sized tanks, improper pressure switch settings, control malfunctions,
broken check valves, and chattering contacts.)
This "Rapid Cycle" feature only allows for a manual
reset. This means that when a rapid cycle is detected,
the pump is turned off and it will remain off until the Cycle
Sensor is manually reset. Undetected "short cycling"
can lead to multiple problems such as submersible pumps unscrewing
themselves from the drop pipe and falling into the well, water
hammer, contact failure, stripped splines or couplings, broken
pump or motor shafts, and ultimately system failure.
The "Dry Run" feature of the Cycle Sensor,
unlike other similar relays that look for dry run conditions,
can detect the minute differences between the low current
achieved when the pump is restricted by a Cycle Stop Valve
(or any other valve that restricts the pump to match a low
flow demand), and the slightly lower current that occurs when
the pump has actually run dry. (For example, if the inlet
to the pump became clogged with debris and low current is
not detected at this point, the pump and or motor could be
destroyed from a lack of cooling flow. Low current can also
be caused by cavitation and broken pump shafts or couplings).
After a 10 second delay, the pump will be shut down before
damage from running dry can occur.
This "Dry Run" feature allows for either a manual
reset or a timed restart. The timed restart is adjustable
from 0 minute to 300 minutes to allow low producing wells
to recover before the pump automatically restarts. The manual
reset option is designed to protect systems where the loss
of the water supply would be out of the ordinary but a possibility.
Note: Standard overloads do not detect dry run or rapid
cycle conditions until damage has occurred and some part of
the electrical system has failed. The Cycle Sensor does not
control or monitor overload conditions nor is it meant to
replace standard overloads, which normally come in the motor
or motor starter.
The Cycle Sensor is available in three models:
- Model CS1PH1-2HP works with 230V single phase pumps from
1/2HP to 2HP
- Model CS1PH3-15HP works with single phase pumps from 3HP
to 15HP
- Model CS3PH1-500HP works with three phase pumps from 1HP
to 500HP
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