NOTE
Amaprop 1000 or 2500 mixers installed in biogas plants must be operated with frequency
inverters!
DANGER
Operation outside the permitted frequency range
Explosion hazard!
▷
Never operate an explosion-proof submersible mixer outside the specified
range.
DANGER
Incorrect setting of frequency inverter current limit
Explosion hazard!
▷
Set the current limit to max. 1.2 times the rated current indicated on the name
plate.
When selecting the frequency inverter, check the following details:
▪
Data provided by the manufacturer
▪
Electrical data of the submersible mixer, particularly the rated current
Observe the following limits when operating the submersible mixer via frequency
inverter:
▪
Only utilise up to 95 % of the motor power rating P
2
indicated on the name
▪
Frequency range 25-50 Hz
If the mixers are operated via frequency inverter, RFI emissions will occur, the level of
which varies depending on the inverter used (inverter type, interference suppression
features, manufacturer). To ensure compliance of the drive system consisting of
submersible motor and frequency inverter with the limits stipulated by EN 50081,
always observe the EMC information provided by the inverter manufacturer. If the
manufacturer recommends shielded power cables, a submersible mixer with shielded
power cable must be used.
The submersible mixers generally meet the requirements on interference immunity
stipulated by EN 50082. For monitoring the sensors installed, the operator must
ensure sufficient interference immunity by selecting and routing the cable in the
plant accordingly. No modifications are required on the power cable of the
submersible mixer itself. Suitable analysing devices must be selected. In this case we
recommend to monitor the leakage sensor fitted inside the motor by means of a
special relay available from KSB.
5.4.1.4 Sensors
DANGER
Operating an incompletely connected submersible mixer
Explosion hazard!
▷
Never start up a submersible mixer with incompletely connected power cables
or non-operational monitoring devices.
The submersible mixer is equipped with sensors designed to prevent hazards and
damage to the mixer.
Measuring transducers are required for analysing the sensor signals supplied. Suitable
devices for 230V~ can be supplied by KSB.
NOTE
Reliable and safe operation of the submersible mixer within the scope of our warranty is
only possible if the sensor signals are properly analysed as stipulated in the manual.
Selection
Operation
Electromagnetic
compatibility
5 Installation at Site
Amaprop®
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Goodnal STP ST041 Biological Treatment (KSB Amaprop Installation and Operating Manual) Vendor Manual
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Active 29/10/2013
Page 19 of 60
