Electrical Connection - Grundfos UNILIFT AP12 Installation And Operating Instructions Manual

3.2.5 Adjusting the float switch cable length
For pumps supplied with a float switch, the difference
in level between start and stop can be adjusted by
changing the free cable length between the float
switch and the pump handle.
• An increased free cable length will result in fewer
starts and stops and a large difference in level.
• A reduced free cable length will result in more
frequent starts and stops and a small difference in
level.
The stop level must be above the pump inlet to
prevent the pump from taking in air.
Start and stop levels
Pos. Description
1 Start
2 Stop
The start and stop levels vary according to the cable
length.
UNILIFT AP start and stop levels
Minimum cable
length (L):
100 mm
Start
Pump
type
[mm]
AP12.40 360
AP12.50 410
AP35 440
AP50 460
* Minimum stop level during continuous operation or
when using an external controller.
8
L
1
2
Maximum cable
length (L):
250 mm
Stop Start Stop*
[mm] [mm] [mm]
230 370 100
250 380 110
280 450 155
320 450 190

4. Electrical connection

DANGER
Electric shock
Death or serious personal injury
‐
Switch off the power supply before you
start any work on the product.
‐
Make sure that the power supply can-
not be switched on accidentally.
DANGER
Electric shock
Death or serious personal injury
‐
The installation must be fitted with a re-
sidual-current device (RCD) with a trip-
ping current less than 30 mA.
DANGER
Electric shock
Death or serious personal injury
‐
Make sure that the power supply plug
delivered with the product is in compli-
ance with local regulations.
‐
The plug must have the same protec-
tive earth (PE) connection system as
the power outlet. If not, use a suitable
adapter if allowed by local regulations.
DANGER
Electric shock
Death or serious personal injury
‐
Power cables without a plug must be
connected to a supply disconnecting
device incorporated in the fixed wiring
according to the local wiring rules.
All electrical connections must be carried
out by a qualified person in accordance
with local regulations.
Depending on local regulations, a pump
with minimum 10 m of mains cable must
be used if the pump is used as a portable
pump for different applications.