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Goodnal STP ST041 Biological Treatment (KSB Amamix Direct Installation and Operation Manual) Vendor Manual
Selection
Operation
Electromagnetic
compatibility
Q-Pulse Id VM385
5 Installation at Site
5.4.1.1 Overload protection
1. Protect the submersible mixer against overloading by a thermal time-lag
overload protection device in accordance with IEC 947 and local regulations.
2. Set the overload protection device to the rated current specified on the name
plate. (⇨ Section 4.3 Page 12)
5.4.1.2 Level switch
DANGER
Dry-running of submersible mixer
Explosion hazard!
▷ Never allow an explosion-proof submersible mixer to run dry!
CAUTION
Propeller not fully submerged
Damage to the submersible mixer!
▷ Never allow the liquid level to drop below the submersible mixer during mixer
operation (not even for short periods).
Automatic mixer operation in a tank requires the use of level control equipment.
Observe the specified minimum fluid level. (⇨ Section 6.2.2.1 Page 24)
5.4.1.3 Frequency inverter operation
The submersible mixer is suitable for frequency inverter operation as per IEC
60034-17.
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 a 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
plate. (⇨ Section 4.3 Page 12)
▪ Frequency range 25-50 Hz
Frequency inverter operation produces RFI emissions whose level varies depending on
the inverter used (type, interference suppression, make). To prevent the drive system,
consisting of a submersible motor and a frequency inverter, from exceeding the limits
stipulated in EN 50081 always observe the EMC information provided by the inverter
manufacturer. If the manufacturer recommends a shielded power cable, a
submersible mixer with shielded power cable must be used.
The submersible mixers generally meet the interference immunity requirements to
EN 50082. For monitoring the sensors installed, the operator must ensure sufficient
Amamix® direkt
Active 29/10/2013
indicated on the name
2
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