Product Manual

wc_tx001983gb.fm
23
PS(A)2 800 / PSW3 1500 Operation
Circle
Thermal
Protector
The pump has a built-in motor protection system. If an excessive current is
detected or the motor overheats, for reasons such as the following, the pump will
automatically stop operating regardless of the water level, to protect the motor:
 Change in supply voltage polarity
 Overload
 Open-phase operation or operation under constraint
Note: Always determine the cause of the problem and resolve it before resuming
operation. Simply repeating cycles of stopping and restarting will end up damaging
the pump. Do not continue operation at very low lift, low water level, or while the
strainer stand is clogged with debris. Not only will performance suffer, but also such
conditions may cause noise, heavy vibration, and malfunctioning.
Operating Cycle of Automatic Type (PSA2 800) .
Stage Level Relay Unit Pump Water Level
1 When electrodes (b) of level relay unit (a) sub-
merge under water, the resulting electric current
causes the pump to operate. (Electrodes sensing
the electricity)
Operation
starts
(drainage)
Falls
2 When the water level goes below the height of the
electrodes, a timer is activated. The pump keeps
operating. (No electric current –>Timer activates.)
Operation
remains (drain-
age)
Falls
3 The pump keeps operating for approximately one
minute. (The pump resumes the operation if the
electrodes contact the water again within one
minute.)
Operation
remains (drain-
age)
Falls
4 The pump stops one minute later. (The pump may
not stop operating for a longer period of time.)
Operation
stops
Rises
5 When the water level rises again and the elec-
trodes touch the water, the pump starts operating
again. (Electrodes sensing the electricity)
Operation
starts again
(drainage)
Falls