P o w e r D e f e n d e r 1 4 0 f o r W a t e r w a y P o o l P u m p M o t o r
I n s t a l l a t i o n a n d O p e r a t i o n M a n u a l
11
Motor Protections
The unit is designed to protect itself in the event of a fault situation. Fault handling is defined below:
·
The drive disables power to the motor. (The motor will coast to a stop.)
·
If the fault condition clears, the control attempts to restart automatically, when a valid command
signal is present. For example, if an over-temp fault occurs, the control does not attempt to restart
the motor until the temperature drops below the fault threshold.
·
The control continues to cycle through the logic sequence indefinitely, so long as a valid command
signal is present.
Low Temperature Monitor
When the control senses the ambient temperature dropping below the threshold level (as defined by
the end-user), the control sends a command for the motor to run at 1200 RPM to help prevent water
from freezing in the pool plumbing.
Motor Stalled
When the control detects that the rotor is locked, the motor shuts down and automatically restart
when operating conditions are within specifications.
Open Output Phase
When one or more of the three phase lines between the motor and control is not connected well, the
output voltage in the control is not able to reach the motor. The motor cycles through the
shutdown/restart sequence the number of times indicated in the Retry Count to correct the fault
condition. If that is unsuccessful, the motor stops.
Output Over Current
Motor output power is reduced until the current returns to normal operating parameters. If the motor
is unable to reach normal operating current by reducing output power, the motor turns off. If the
condition clears, the motor automatically restarts
.
Output Over Power
The control monitors shaft output power continuously using estimated speed and torque produced by
the motor shaft. The control limits the torque of the motor to maintain shaft output power below or
equal to the maximum power limit. If the overload condition reduces the speed beyond the designed
operating range, the motor stops.
Power Module Temperature
Motor output power is reduced until the power module temperature returns to normal operating
parameters. If the motor is unable to reach normal operating temperature by reducing output power,
the motor turns off. If the condition clears, the motor automatically restarts.
Under Voltage
The control turns the motor off for low voltage. When the voltage returns to acceptable operating
levels the motor automatically restarts.
