KSB UPA - Operating Limits; Frequency of Starts; Supply Voltage; Fluid Handled

6.2 Operating limits
DANGER
Non-compliance with the operating limits
Damage to the pump set, especially to the motor!
▷ Never operate the pump set outside the limits specified below.
6.2.1 Frequency of starts
Observe the following values:
Table 15: Frequency of starts and standstill periods
Motor type series Maximum No. of starts
per [h]
Minimum standstill
period [min]
T < 5 6
V < 5 6
X < 5 6
Z < 5 6
E < 3 10
6.2.2 Supply voltage
Observe the permissible voltage and frequency fluctuations to DIN EN 60034-1
section A; U
N
± 5 %, f
N
± 2 %. The limits may differ if specified in the order, see order
confirmation.
Star point displacement
Operation with displaced start point must not exceed the value U
0
> 0.2 x U
N
and
must be limited to one operating hour.
6.2.3 Fluid handled
6.2.3.1 Minimum submergence
The submergence X of the pump sets must be ≥ 0.5 m for the following examples of
vertical and horizontal installation.
A higher submergence may be required by the NPSH value specified in the order
documentation or the value indicated in the following diagram.
0,0
0,5
1,0
1,5
2,0
X
m
Q l/s
0
100
200
50
150
0
100
200
Q m
3
/h
600300 500 800700
Fig. 11: Minimum submergence depending on the flow rate
The values in the above mentioned diagram apply to submersible borehole pumps up
to size UPA 350.
For larger pump sets refer to the value X in the order documentation or the data
sheet. Contact the manufacturer, if required.
NOTE
The water level in the well is usually measured with a water level contact meter
(well dipper).
6 Commissioning/Start-up/Shutdown
UPA, UPZ, BSX
41 of 64