Wacker Neuson PS2A 800, Operator'S Manual

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PS2 800 / PSA2 800 Operation
4.3 Motor Protection System
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.
4.4 Operating Cycle of Automatic Type
Stage Level Relay Unit Pump Water Level
1 When electrodes (b) of level relay units (a)
submerge 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
(drainage) 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
(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 sensing the electricity) Operation
starts again
(drainage) Falls