24
MAINTENANCE
PERIÓDICAL MAINTENANCE:
Change oil after the first 500 hours. Next changes will be every 2000 hours
(minimum once a year).
Check the piston every 3 months or 1000 hours.
Check the seals every 3 months or 1000 hours.
Check the diaphragm every 3 months or 1000 hours.
Check the bellows every 3 months or 1000 hours.
Check the suction filter once a month.
Check the valves every 3 months or 1000 hours.
It is advisable to clean periodically the injector, letting clean water flow through it
(we can make it coincide with the emptying of the tank), to eliminate precipitated
rests that can remain in the inner part of the cylinder or in suction / impulsion
pipes.
If we are using highly corrosive liquids it is advisable to double the
frequency of checkings.
Before any maintenance operation we will check:
That the pump is stopped and disconnected from the electric
supply.
There is no pressure neither inside the head nor in the impulsion
pipe. It is advisable to empty the head before opening it.
The staff in charge of the maintenance will use the adequate
protection means in order to manipulate the dosed liquid.
25
PROBLEM
MOTOR DOES NOT
RUN
MOTOR RUNS HOT
MOTOR RUNS BUT
PUMP DOES NOT
INJECT OR
INJECTION IS
INFERIOR THAN
NOMINAL ONE
PUMP TRICKLES
LIQUID THROUGH
INFERIOR CYLINDER
HOLE
PUMP TRICKLES OIL
THROUGH INFERIOR
CYLINDER HOLE
PUMP LEAKS OIL
THROUGH
REGULATOR
CAUSE
THERE IS NO VOLTAGE
MOTOR PROTECTION HAS BLOWN
UP
A PHASE IS FAILING (three-phase);
WRONG INCOMING VOLTAGE
SUPERIOR CONSUMPTION THAN
NOMINAL ONE
LOW WORK FREQUENCY (only with
inverter)
PUMP HAS NOT BEEN PRIMED
SUCTION / IMPULSION VALVES ARE
DIRTY OR DAMAGED
SUCTION FILTER IS DIRTY
AIR COMES INTO SUCTION PIPE
CAVITATION IN SUCTION
DAMAGED SEALS
DAMAGED PISTON
DAMAGED BELLOWS
DAMAGED REGULATOR O’RINGS
SOLUTION
- Check with a voltimeter incoming
voltage
- Check with ammeter that current is not
superior than nominal one
- Check with voltmeter tension in motor
terminals
- Check that incoming tension coincides
with motor one (-10% / +10%)
- Check that injection pressure is not
superior to the one specified in the
module
- Check with a voltmeter incoming
tension
- Increase working frequency with
inverter
- Prime the pump injecting at zero
pressure
- Clean or change valves
- Clean filter
- Check sealing in connection points
- Increase pipe diameter
- Reduce sucion pipe length
- Reduce speed through an inverter
- Use a less viscous liquid
-· Change seals
-.Change piston
- Change bellows
- Change o’rings
Summary of Contents for DOSTEC-50
Page 1: ...ENGLISH DOSTEC 50 ...
Page 27: ......
