Start/Stop Level; Electrical Connection - Grundfos Unilift KP serie Montage- Und Betriebsanleitung

6.4 Start/stop level

6.4.1 Unilift KP-A
The level difference between start and stop can be
adjusted by changing the free cable length between
the pump handle and the float switch.
• A long free cable length gives fewer starts/stops
and a large level difference.
• A short free cable length gives frequent starts/
stops and a small level difference.
To enable the float switch to start and stop the pump,
the free cable length (L) must be minimum 70 mm
and maximum 150 mm. See fig. 6.
L
‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
Fig. 6 Start/stop levels, Unilift KP-A
Cable length
min. 70 mm
Pump type
Start
[mm]
Unilift KP 150 A
290
Unilift KP 250 A
Unilift KP 350 A 300
6.4.2 Unilift KP-AV
The level difference for pumps with vertical level
switch cannot be adjusted. Start/stop levels appear
from fig. 7.
Fig. 7 Start/stop levels KP-AV
* Unilift KP 350.
Start
Stop
Cable length
(L) (L)
max. 150 mm
Stop Start Stop
[mm] [mm] [mm]
140 335 100
150 345 110
Start
Start
80 mm
80 mm
Stop
Stop
100 mm (110 mm*)
100 mm

6.5 Electrical connection

The electrical connection must be carried out in
accordance with local regulations and standards.
Check that the mains voltage and frequency
correspond to the values stated on the pump
nameplate.
Warning
The pump must be connected to an
external mains switch with a minimum
contact gap of 3 mm in all poles.
As a precaution, all pumps must be
connected to a socket with earth
connection.
We recommend that you fit permanent
installations with an earth leakage
Note
circuit breaker (ELCB) with a tripping
current less than 30 mA.
Warning
Pumps for swimming pools, outdoor
fountains, garden ponds and similar
applications must be provided with an
earth leakage circuit breaker (ELCB)
with a tripping current less than 30 mA.
The pump motor incorporates thermal overload
protection and requires no additional motor
protection.
If the motor is overloaded, it will stop automatically.
When the motor has cooled to normal
Note
temperature, it restarts automatically.
Motors for Unilift KP 350, 3 x 200 V, 50 Hz, must be
connected to a motor-protective circuit breaker.
Three-phase pumps with float switch (Unilift KP-A)
must be connected to the mains supply by means of
a contactor. See fig. 8.
Fig. 8 Wiring diagram
7