6 Commissioning/Start-up/Shutdown
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UPAchrom
6.2 Operating limits
6.2.1 Frequency of starts
To prevent inadmissible heat build-up in the motor, the following max. number of
starts or minimum standstill periods must be complied with:
▪
20 start-ups per hour
▪
Minimum standstill periods of three minutes
6.2.2 Supply voltage
Observe the permissible voltage and frequency fluctuations to DIN EN 60034-1
section A; V
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 V
0
> 0.2 x V
N
and
must be limited to one operating hour.
6.2.3 Voltage limits
Observe the following limits:
▪
Maximum rate of voltage rise du/dt < 500 V/µs.
▪
Maximum voltage peaks - J1 insulation < 600 V.
6.2.4 Operation on a frequency inverter
Do not operate the pump set outside the permissible frequency range of 30 to
50 Hz / 60 Hz.
6.2.5 Star point displacement
The motors are designed for short-time operation with displaced star point (t < 1h).
For prolonged operation and U
0
> 0.2 x U
N
, consult the manufacturer.
6.2.6 Fluid handled
6.2.6.1 Minimum submergence
Observe the minimum submergence of 0.5 metres.
NOTE
The water level in the well is usually measured with a water level contact meter
(well dipper).
Vertical
installation
Measurement for vertical installation:
Upper pump edge to lowest (dynamic) water level.
H
e
- H
t
≥ 0.5 metres!
