18
12. Maintenance and Repair
Before maintenance or repair disconnect the mixer
from the power supply to avoid accidental starting of the
mixer!
In order to guarantee trouble-free operation and a long du-
rability without unnecessary and expensive repair works, it
is very important to have a regular and preventive mainte-
nance every six (6) months.
Mixers are often used under extreme operating conditions.
Therefore it is important to install a motor protection switch
to prevent the motor from blowing due to excessive elec-
tricity uptake.
If the safety function has been activated, the mixer can be
started again after the reason for the interruption has been
eliminated. This may be due to e.g. too low current, block-
ing of the propeller or overheating of the motor. The cooling
of an overheated motor may take up to one full hour.
In case of repair works this is to be carried out only in a
specialized work shop.
In case of repair work only original spare parts as indicated
in the list of spare parts are to be used.
All inquiries or orders for spare parts must include the
number of the machine! If the specification plate contains a
serial number (that only gives details of its electrical layout),
the data stamped into the motor casing must also be
supplied.
Servicing chart
Service
operation
Lubrication
Inspection
Electric
motor
Maintenance
free.
The roller
bearings are
sealed for life.
(To be re-
placed only if
they develop
noise.)
---
Power
cable
---
---
The power cable
must be
checked once a
year for surface
damage, strain
and kinks, etc.
Immediate re-
placement by
the manufac-
turer in case of
damage.
Sealing
casing
---
Oil change
every 8000
hours. Min.
every 2 years
(see page 24)
---
Propeller
---
---
Check the pro-
peller blades
periodically for
wear and tear.
13. Fault Finding Chart
Before maintenance or repair disconnect the mixer
from the power supply to avoid accidental starting of the
mixer!
1. Operating voltage is not available or is inadeqate
- Check the electrical installation
- Call in the electrician
2. Motorcable is faulty
- Manufacturer must be contacted.
3. Faulty control panel
- Manufacturer must be contacted.
4. Mixer blades cannot rotate
- The mixer must be switched offand secured against fur-
ther use
- Clean the blades and manually check rotation.
5. The stator windings are faulty
- Manufacturer must be contacted.
6. Faulty automatic system equipment
- Manufacturer must be contacted.
7. Different phase voltages
- Manufacturer must be contacted.
8. Motor contactor is set too low or is faulty
-Check the thermal relay; adjust the motor cotactor to rated
current.
9. Leakage monitor is switching the mixer off
- Leakage monitoring only when the mixer is submerged
- Manufacturer must be contacted.
10. Mixer blades rotate in the wrong direction
-Transponse two phases of the main supply.
11. Mixer runs on two phases
-Replace faulty fuses.
-Check the supply connections.
12. Internal parts are excessively worn
- Manufacturer must be contacted.
13. Propeller blades are dirty or damaged
-The mixer must be switched off and secured against fur-
ther use.
- Clean the blades and inspect for any wear.
- Manufacturer must be contacted.
14. Faulty motor roller bearings.
- Manufacturer must be contacted.
15. Oscillations caused by the installation (resonance)
- Manufacturer must be contacted.
Summary of Contents for HRS 15/6
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