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6.3 Dry Well/Deadhead Protection & Low Production Well Control
The following parameters allow the drive to be programmed to protect the pump from dry
run/deadhead conditions and to better perform in low producing well conditions.
DRY WELL CURRENT DRY WELL KW ENABLE RESTARTS
DRY WELL DELAY RESTART DELAY 2 RESTARTS DRY WELL
In water well pump applications it is important to protect the pump from dry run condition by
setting the DRY WELL CURRENT or DRY WELL KW parameter (found under
OPERATING PARAMETERS) so that the drive stops and registers an underload fault in
the Restart Log. DRY WELL DELAY can be programmed to auto restart after a delay to
allow time for the water level to recover. The number of restarts allowed can be
programmed through the RESTARTS DRY WELL parameter. The Restart Log allows the
user to monitor the type and number of faults that have occurred. If the number of dry well
faults exceeds the number of automatic restarts allowed for that fault, the drive will remain
OFF until the Restart Log is cleared, which resets ALL resettable fault counters. See Auto
Restarts in Section 5.3, for more information.
6.4 Motor Overload Protection
Essential Series drives are equipped with adjustable solid state motor overload protection.
Protection is based on a Class 10 trip curve. Motor overload settings are selected by
navigating to the appropriate menu item using the keypad and display.
Thermal Memory and Thermal Memory Retention
The motor overload protection is equipped with thermal memory and thermal memory
retention capabilities.
THERMAL MEMORY is the ability of an overload protective system to approximate the
heating cooling of a protected motor during operation.
THERMAL MEMORY RETENTION maintains the thermal memory upon shutdown or
power loss. This includes retention of the last thermal value, and may include an ongoing
reduction of this thermal value to reflect the cooling of the motor. This information will be
used by the overload protective system to approximate the thermal state of the motor upon
restart.
CAUTION: Do not attempt to restart the motor immediately after a motor overload
fault. The motor overload protection system uses a timer to approximate motor cooling and
may trigger an immediate overload fault if the motor is restarted too soon.
Setting Motor Overload Protection with Keypad
To set motor overload protection with the keypad, navigate to the Main Menu item
CHANGE PARAMETER VALUES > CHANGE OPERATING PARAMETERS >
OVERCURRENT LIMIT. Refer to Section 4.5 Changing Parameter Values, Table 12
Operating Parameters for detailed instructions.
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