6 Commissioning/Start-up/Shutdown
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Amarex
2573.820/02-EN
6.2.3 Operation on a frequency inverter
Operation of the pump set on a frequency inverter is permitted in the following
frequency range:
▪ 30 to 50Hz
CAUTION
Pumping solids-laden fluids at reduced speed
Increased wear and clogging!
▷ Never operate the pump set with flow velocities below 0.7 m/s in horizontal
pipes and 1.2 m/s in vertical pipes.
6.2.4 Fluid handled
6.2.4.1 Fluid temperature
The pump set is designed for transporting liquids. The pump set is not operational
under freezing conditions.
CAUTION
Danger of freezing!
Damage to the pump set!
▷ Drain the pump set or protect it against freezing.
Refer to the maximum permissible fluid temperature and ambient temperature
indicated on the name plate and/or in the data sheet.
6.2.4.2 Minimum level of fluid handled
DANGER
Pump set running dry
Explosion hazard!
▷ Never allow an explosion-proof pump set to run dry!
CAUTION
Fluid level below the specified minimum
Damage to the pump set by cavitation!
▷ Never allow the fluid level to drop below the specified minimum.
The pump set is ready for operation when the fluid level has reached dimension R3,
R3´, R4 or R4´ as a minimum (see outline drawing).
Fig.18: Minimum fluid level
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