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Installation and operating instructions • Wilo-Flumen OPTI-TR 50-3 ... 120-1, Wilo-Flumen EXCEL-TRE 50-3 ... 90-2 • Ed.01/2022-07
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7.6
Switch on and off
The mixer must switch on and off using a separate operating point (on/off switch,
switchgear) set by the customer.
•
When the mixer starts, the rated current is exceeded for a short time.
•
Current consumption continues to be slightly above the rated current during the start-
up phase, until the flow in the basin increases.
•
During operation, do not exceed the rated current any more.
CAUTION! Material damage! If the mixer does not start up, switch it off immediately.
Motor failure! Remove the fault first before reactivation.
7.7
During operation
WARNING
Risk of injury from rotating propeller!
No persons are allowed to be present in the working area of the mixer.
There is a risk of injury!
• Demarcate and cordon off the working area.
• If there are no persons in the working area, activate the mixer.
• If persons enter the working area, switch off the mixer immediately.
Please regularly check the following points:
•
Mixer free from deposits and encrustations.
•
Connection cable is not damaged.
•
Minimum water submersion ensured.
•
Quiet and low-vibration running.
•
Max. switching frequency not exceeded.
•
Mains connection tolerances:
–
Operating voltage: +/-10 %
–
Frequency: +/- 2 %
–
Current consumption between the individual phases: max. 5 %
–
Voltage difference between the individual phases: max. 1 %
Increased current consumption
Depending on the fluid and the flow, the current consumption may vary slightly. If current
consumption is elevated for a longer period, this indicates a change in configuration. The
cause for a change in conditions could be:
•
A change in the viscosity and density of the fluid, e.g. caused by modified addition of
polymers or precipitating agents.
CAUTION! This modification may cause a severely
increasing power consumption and even overload the system!
•
Insufficient mechanical pre-cleaning, e.g. fibrous and abrasive content.
•
Non-homogeneous flow conditions due to fixtures or deflections in the operating
space.
•
Vibrations due to blockage of the basin inlet/outlet and draining, modified air intake
(aeration) or the combined effect of several mixers.
Check system configuration and take counter-measures.
CAUTION! Permanently in-
creased current consumption causes increased wear on the mixer!
Contact customer
service for further assistance.
Monitoring fluid temperature
The fluid temperature must not drop below 3 °C. A fluid temperature below 3 °C results in
thickening of the fluid, which can result in fractures in the propeller. If the fluid temperature
may fall below 3 °C, install an automatic temperature measurement device with advance
warning and deactivation functions.
Monitoring minimum immersion
The propeller must not emerge from the fluid during operation. Minimum immersion spe-
cifications must be observed! If fluid levels fluctuate significantly, install a level monitoring
device. If the fluid level drops below the minimum immersion level, switch off the mixer.
8
Shut-down/dismantling
8.1
Personnel qualifications
•
Operation/control: Operating personnel, instructed in the functioning of the complete
system
