IMER SMALL 50 Manual De Uso, Mantenimiento Y Repuestos página 24

OVERLOAD AND ELECTRICAL PROTECTIONS
- The electric motors are protected against overload by
thermal magnetic cut-outs, the activation of which is indicated by
total shutdown of the machine. In this case, after the motors have
cooled, the specific personnel should reset the main switch to
resume operation.
For the pump motor there is an additional safety protection: a
thermal sensor shuts down the machine in the event of a motor
temperature overload.
-The inverter device housed inside the electrical panel is
equipped with protections for the event of a power failure or if
power exceeds the set admissible limits, voltage fluctuations
caused by other site utilities, overload of the electric motor
due to improper use or overheating of the inverter.
Activation of these safety devices is indicated by illumination
of a red light (ref. 9), in which case, authorised personnel
must remedy the cause and resetthe safety device via the
main switch, turning it from 0 to 1.
- The main switch on the electrical panel (ref. 3) is only ena-
bled when: power is connected to the protection grid or the
vibroscreen is fitted on the machine.
12. OPERATION (see fig.1)
- The hopper safety grid must always be fitted.
Never place materials other than premixed wet materials in the
hopper.
- Removal of the hopper grid or vibro-screen causes
shutdown of the machine moving parts. If this occurs, the grid
or vibro-screen must be refitted and the main switch must be
reset to restart the machine.
- Wear envisaged personal protection devices before
starting work
Interruptions exceeding 30min should be avoided, and in any event
these pauses should be reduced to the minimum possible when
using rapid-drying materials
Prolonged shutdown can cause clogging in the material delivery
lines: in this case no material is delivered from the jet and the
pressure gauge indicates a higher pressure than the normal
working value.
In this case, turn the selector anticlockwise (opposite position
to normal work setting), the pump motor rotates in the opposite
direction and the pipelines are depressurised. As soon as the
pipeline becomes soft and flexible (the pressure gauge reads 0
bar), stop the machine.
Locate the point of clogging in the hose and remove by tapping
the hose with a rubber mallet and totally empty by hand.
- If necessary, disconnect the jet or open the pipeline
couplings, checking previously if any residual pressure is
present.
The material pressure gauge must indicate 0 bar and the
pipelines, excluding the clogged sections, must be flexible.
The personnel assigned for this task must be specially trained
in these procedures.
In the event of any doubt as to the presence of residual pres-
sure, never open the couplings.
Reconnect the pipelines and spray jet, set the main switch to the
correct position and restart the machine.
- Do not move the machine with the hopper full.
A reduction in material flow to the jet may indicate a worn pump.
To replace the pump, proceed as follows: with the machine empty
and clean, remove the hopper grid, tilt the machine with manifold
upwards, remove the wedges, with the aid of a mallet, and at the
same time remove the delivery manifold, screw and stator (fig.N).
To insert the screw in the stator, use the lubricant spray available
from IMER. Never use mineral oil or grease for screw assembly
as this may damage the stator. Avoid all types of benzene.
Refit the pump taking care to insert the mixer in the envisaged
IMER INTERNATIONAL S.p.A.
IMER MORTAR MIXERS
seats.
In the case of a power failure during operation, clean the machine
and pipelines immediately. Also disassemble the pump, remove
the screw from the stator and clean. On completion reassemble all
components.
Refit the pump taking care to insert the mixer in the envisaged
seats.
13. MACHINE SHUTDOWN AND CLEANING
At the end of work, stop the machine after completely emptying
the hopper by means of the relative selector and set the main
switch to 0.
- Open the jet valve, detach the jet and clean thoroughly, cleaning
the nozzle with the special tool supplied.
there is no residual pressure.
-Disconnect the material pipelines from the delivery manifold.
-Remove the hopper grid or vibro-screen and clean thoroughly.
-Remove the plug at the bottom of the hopper and use water
to wash the machine thoroughly, starting from the bag splitter if
installed
- Refit the plug in the hopper and fill with water.
-Restart the machine for a few seconds until clean water is delive-
red from the manifold: this confirms complete cleaning of the pump.
- While the pipelines are still full, insert two cleaning sponges and
refit the pipeline in the manifold (fig.8)
- Start the machine again so that the water in the hopper is pumped
through the pipelines to remove all residue.
When the two sponges are delivered from the hose, washing is
complete.
- At this point, on completion of machine cleaning, turn off the main
switch, and disconnect the power plug.
If there is any risk of freezing, open the hopper plug, disconnect
the pipelines and drain all water from the circuit (fig.9).
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- Before disconnecting the jet or pipelines, ensure that