Electric Panel Level Switches; Thermal Switch - DAB FK Série Instructions Pour L'installation Et La Maintenance

400 Y/D 50Hz
380-480 Y/D 60Hz
Without sensor
6.2

Electric panel level switches

During operation the electropump must be immersed in the pumped liquid. It is necessary to install a control system with
level switches (level probes or floats or other appliances) that ensure the minimum level of liquid and protect the electropump
against dry running.
When installing the level switches, observe the following points:
To prevent air intake and vibrations install the stop level switch in such a way that the pump is stopped before the liquid level is
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lowered below the top of the cable entry.
In tanks with one pump, install the start level switch in such a way that the pump is started at the required level; however, the
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pump must always be started before the liquid level reaches the bottom inlet pipe to the tank.
In tanks with two pumps, the start level switch for pump 2 must start the pump before the liquid level reaches the bottom inlet pipe
•
to the tank, and the start level switch for pump 1 must start this pump correspondingly earlier.
If installed, always install the high-level alarm switch about 10 cm above the start level switch; however, the alarm must always be
•
given before the liquid level reaches the bottom inlet pipe to the tank.
For further information on electric panels and the
respective use of level switches, contact DAB Pumps.
Switches or sensors in potentially explosive
environments must be certified for this application.
6.3

Thermal switch

All FKV and FKC pumps have thermal protection incorporated in the stator windings (see wiring diagrams, contacts k1, k2) See parag.
6.1.
The thermal switches are inserted in the motor windings and intervene by opening and interrupting the circuit when an excessive
temperature is reached in the windings (about 150°C).
Non explosion-proof pumps
For correct operation the thermal switch must be connected to a device for interrupting the power supply circuit of the
electropump. When the electropump has cooled, once the circuit of the thermal switch has been reset, the device can
automatically restart the pump.
Explosion-proof pumps
The device for interrupting the power supply circuit of explosion-proof pumps must not restart the pump
automatically. This ensures protection against over temperature in potentially explosive environments.
Sensor Version
ENGLISH
230 Y/D 50Hz
220-277 Y/D 60Hz
Without sensor
Fig. 9 Start and stop levels
Make sure that the effective volume of the tank does
not become so low that the number of starts per hour
exceeds the maximum permissible number.
25
Sensor Version
Min. 10cm
Alarm
Start
Stop S1 operation
Stop S3 operation
Fig. 9