General Description - Grundfos SEG AUTOADAPT Montage- Und Betriebsanleitung

2. General description

The electronic Grundfos SEG pumps incorporate
a controller and motor-protective functions. They
only need to be connected to the mains supply.
The controller offers the following benefits:
• Built-in level and dry-running sensors.
• Built-in motor protection.
• Pump alternation.
If several pumps are installed in the same tank,
the control logic incorporated in the pump will
ensure that the load is distributed evenly among
the pumps over time.
• Alarm relay output.
The pump incorporates an alarm relay output.
NC and NO are available and can be used as
required, for example for acoustic or visual
alarms.
• Anti-seizing system.
The anti-seizing system starts the pump at
programmed intervals to prevent the impeller
from seizing up.
• Random start delay.
This function ensures an even mains load when
several pumps are started at the same time after
an unintentional power cut.
The SEG pumps are designed with a grinder system
which grinds solids into small pieces so that they can
be led away through pipes of a relatively small
diameter.
SEG pumps are used in pressurised systems, e.g. in
hilly areas, and for similar applications.
Warning
Special conditions for safe use of SEG
explosion-proof pumps:
• Bolts used for replacement must be
class A2-70 or better according to
EN/ISO 3506-1.
• The thermal switch in the stator
windings with a nominal switch
temperature of 150 °C shall
guarantee the disconnection of the
supply; the resetting of the supply
shall be manually.
Fig. 1 SEG pump
Pos. Description
1 Cable plug
2 Electronic unit
3 Discharge flange DN 40/DN 50
4 Discharge port
5 Lifting bracket
6 Stator housing
7 Level sensor
8 Oil screw
9 Clamp
10 Dry-running sensors
11 Pump foot
12 Pump housing
9