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.
L
Fig. 4 Start and stop levels
The start and stop levels vary according to the cable
length.
Unilift AP start and stop levels
Minimum cable
length (L):
100 mm
Pump Start
type [mm]
AP12.40 360
AP12.50 410
AP35 440
AP50 460
* Minimum stop level during continuous operation
or when using an external controller.
Start
Stop
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
starting any work on the product.
- Make sure that the power supply cannot
be accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
- The installation must be fitted with a
residual-current device (RCD) with a
tripping 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
compliance with local regulations.
- The plug must have the same protective
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.
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