Wacker Neuson 0620339, Operator'S Manual

Page: 23 / 52

PS(A)2 800 / PSW3 1500 Operation
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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)
submerge under water, the resulting elec-
tric 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 acti-
vated. The pump keeps operating. (No
electric current –>Timer activates.) Operation
remains
(drainage) Falls
3 The pump keeps operating for approxi-
mately one minute. (The pump resumes
the operation if the electrodes contact the
water again within one minute.) Operation
remains
(drainage) 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
electrodes touch the water, the pump
starts operating again. (Electrodes sens-
ing the electricity) Operation
starts again
(drainage) Falls