Operation
PS 2 500 / PS 2 750 / PSA 2 500
24
wc_tx001986gb.fm
4.3
Motor Protection System (Motor Protector)
Circle Thermal protector (PS 2 750)
Miniature Protector (PS 2 500, PSA 2 500)
The pump has a built-in motor protection system. If an excessive
current is detected (PS 2 750) 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 vibra-
tion, 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 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
