KSB UPA - Operation with Autotransformers and Starting Resistors; Operation with Soft Starter; Operation with Frequency Inverter

Rating
The rating specified on the name plate and in the order confirmation applies to
continuous operation S1 to DIN EN 60034-1.
5.6.1 Operation with autotransformers and starting resistors
Set up the starting devices for automatic operation, i.e. switchover from partial to
full voltage must be automatic.
The partial voltage period shall not exceed 4 s. To operate the pump set with a
starting transformer or starting resistor, choose a closed-transition switchover
method (Korndorfer connection).
5.6.2 Operation with soft starter
Submersible motors differ from ordinary standardised asynchronous motors in their
slim design (low moments of inertia), their output, mechanical seal design and
winding type.
The following reference values, based on our experience, ensure safe operation of
submersible borehole pumps. The operator is responsible for checking with the
manufacturer of the soft starter that the particular features of submersible borehole
pumps have been taken into account. Depending on the make the indicated
reference values may be exceeded.
Table 11: Reference values for soft starters
Parameter/function Settings
Minimum starting voltage 40 % of the motor's rated voltage
Ramp time / acceleration (run-up) time t
H
< 4 seconds
Current limitation I
A
/ I
N
approx. 3.5
Deceleration (run-down) time / stop ramp t
A
< 4 seconds
All special functions, e.g.
▪ Delayed starting
▪ Current control
▪ Speed control
▪ Kick-start / boost function
OFF
1. After run-up, the soft starter must be bypassed by a contactor.
2.
Always observe the manufacturer's operating instructions.
3. Soft starters for two-phase connection are only permitted if the starter's control
algorithm eliminates the physically caused d.c. components.
4. If the soft starter fulfils motor protection functions, such as an over-current trip
(tripping class 10 or 10A), phase failure, etc., these functions must be ensured
when the soft starter is bypassed by a contactor.
NOTE
Conspicuous noises or vibrations during run-up and run-down could indicate
incorrect parameter settings on the soft starter, such as excessive ramp times,
incorrect operating mode (control) or enabled special functions.
5.6.3 Operation with frequency inverter
The motors of submersible borehole pumps differ from ordinary standardised
asynchronous motors due to their slim design (low moments of inertia), their output,
mechanical seal design and winding type. For this reason, submersible borehole
pumps > 1000 V must only be operated with a frequency inverter, if frequency
inverter operation has been approved for the pump set (see data sheet, order
documentation).
In accordance with DIN EN 61800-4 the drive system supplier is responsible for
clarifying the details of and reaching an agreement on the interface between motor
and frequency inverter.
5 Installation at Site
UPA, UPZ, BSX
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