en
24
Installation and operating instructions • Wilo-Rexa PRO-S • Ed.01/2022-03
NOTICE
Pumping problems due to water level being too low
The hydraulics are self-venting. Smaller air cushions are resorbed during
pumping. If the fluid is lowered too much, separation of the volume flow
may occur. The minimum permissible water level must reach the upper
edge of the hydraulics housing!
Please regularly check the following points:
•
Inlet quantity corresponds to the pump delivery rate.
•
The level control device and dry-running protection work correctly.
•
Minimum water submersion ensured.
•
Connection cable is not damaged.
•
Pump free from deposits and encrustations.
•
No air intake in the pumped fluid.
•
All gate valves open.
•
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 %
NOTICE
Emerge the motor during operation
• If the motor is emerged during operation, observe the “operating
mode non-immersed”! See indication “OT
E
” on the rating plate!
• Ensure cooling of the motor for continuous duty: The motor must be
completely immersed before reactivation!
Longer operating times with non-immersed operation
Longer operating time is possible if cooling of the motor is ensured:
•
S3 10% can be operated according to
S3 25%
!
•
S3 25% can be operated according to
S3 50%
!
CAUTION! Ensure motor cooling: Immerse the motor completely for at least 1 min be-
fore activating it on again.
8
Shut-down/dismantling
8.1
Personnel qualifications
•
Operation/control: Operating personnel, instructed in the functioning of the complete
system
•
Electrical work: qualified electrician
Person with appropriate technical training, knowledge and experience who can identify
and prevent electrical hazards.
•
Installation/dismantling work: trained sewage technology professional
Fixation and pipework in wet well and dry well installation, lifting equipment, basic
knowledge of wastewater facilities
8.2
Operator responsibilities
•
Locally applicable accident prevention and safety regulations of trade associations.
•
Observe regulations for working with heavy loads and under suspended loads.
•
Provide the necessary protective equipment and make sure that the personnel wears it.
•
Provide adequate aeration in closed rooms.
•
Take immediate countermeasures if there is a build-up of toxic or suffocating gases!
8.3
Shut-down
The pump is deactivated, but remains installed. This ensures that the pump is always ready
for operation.
✓
Completely immerse the pump in the fluid to protect the pump from frost and ice.
✓
Minimum fluid temperature: +3 °C (+37 °F).
