Zenit UNIQA Serie Manual De Instalacion Y Uso página 48

Safety, Installation and Operations Manual – Translation of original instructions
7.2 General safety precautions
Before starting any work on pumps used in liquids which could constitute a hazard to health, carry out thorough cleaning and venting of pump,
tank, etc. according to local regulations.
Before cleaning and/or maintenance procedures, a skilled technician must disconnect the pump from the power supply and en-
sure that it cannot start up accidentally. Always disconnect the phase wires first and then the yellow-green ground wire.
Ensure that the pump cannot fall or roll, causing injury or damage.
After prolonged use, the surface of the pump may become very hot: allow it to cool sufficiently to avoid burns.
Always comply with the safety regulations in force in the place of installation, any local regulations and the dictates of common sense.
7.3 Planned maintenance
Maintenance intervals depend on the type of installation, the workload to which the pump is subjected and the type of liquid in which it is immersed.
During planned maintenance or in any circumstances when the pump's performance deteriorates or its vibrations and noise level increase, the
parts subject to wear and tear must be inspected; have this done by an Authorised Service Centre.
EN
Do not use the pump if malfunctioning because sudden failure of the rotating parts may cause hazardous situations or damage to the motor.
For machines subject to -Ex certification, schedule a maintenance plan with a maximum interval of 2 year or 9,000 hours con-
tinuous opeation (which ever comes first) for electric pump re-conditioning, which includes changing the bearings and the
mechanical seals.
A six-month control is also recommended to check the wear of the bearings, the mechanical seals and all other parts subject to
wear, as particularly adverse or incorrect installation conditions can lead to explosion risk.
Interval
Daily Measuring the operating current: to be within the rated current
Measuring the power voltage variation: within ± 5% of the rated voltage
Monthly Inspecting the pump:
•
•
•
NOTE: The motor must be inspected if the insulation resistance is considerably lower than the last inspection
Half-yearly Cleaning and inspection of lifting chain or rope:
- Replace if damage, corrosion, or wear has occurred to the chain or rope.
- Remove if foreign object is attaching to it.
Check winches, hooks and chains for signs of failure or wear and corrosion. Clean or lubricate them if necessary and
replace any damaged components. Remove if foreign object is attaching to it.
Verify that the bolts, nuts and screws are properly tightened. When tigthening, renew the threadlocker if necessary.
Check the fasteners on the bottom every time the tank is empty.
Yearly Check cables, oil, coolant (DRY models), mechanical seals,
bearings, parts subject to wear (impeller, suction flange....).
If the oil contains water, inspect mechanical seal.
Refer to point 7.5 "Inspection".
Once every 2 ye- Changing oil
ars or 9000 hours Refer to point 7.5.3 "Oil inspection and changing procedure"
for heavy duty
Changing the mechanical seals (*)
Once every 2 to 5 Overhaul:
years The pump must be overhauled even if the pump appears normal during operation.
Especially, the pump may need to be overhauled earlier if it is used continuously.
(*) Rubber parts need to be replaced if disassembled during inspection
48
STANDARD version
If the pump's performance has diminished significantly, the propeller may be worn or the impeller may be clogged with
debris. Remove any debris and replace the part if it is worn
Inspecting cables: refer to point 7.5.1 "Electric cable inspection"
Measuring the insulation resistance: Insulation resistance reference value = 20 MΩ minimum
Inspection Item
Check cables, oil, coolant (DRY models), mechanical seals,
bearings, parts subject to wear (impeller, suction flange....).
If the oil contains water, inspect mechanical seal.
Refer to point 7.5 "Inspection".
Changing bearings (*)
better together
-EX version