Wacker Neuson PSA2 500, Руководство оператора, Страница: 23 / 60

PS2 500 / PSA2 500 Operation
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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) 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 min-
ute.) 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