IMER STEP 120 Manual De Uso, Mantenimiento Y Repuestos página 35

OVERLOAD AND ELECTRICAL PROTECTIONS
- The electric motors are protected against overload by
thermal magnetic cut-outs, the activation of which is indica-
ted 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.
Activation of these safety devices is indicated by illumination
of a red light (ref. 7), in which case, authorised persona per-
sonnel must remedy the cause and reset the safety device
via the main switch, turning it from 0 to 1.
- The main switch on the electrical panel (ref. 6) 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 vibrating screen or 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) (ref. 8), the pump motor rotates in the op-
posite 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 vibrating screen or hopper grid, tilt the ma-
chine with manifold upwards, unscrew the tie-rod locking screws
(ref. 1, fig. 9), and at the same time remove the delivery manifold,
screw and stator (fig. 9).
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
seats.
IMER INTERNATIONAL S.p.A.
STEP 120
In the case of a power failure during operation, promptly wash
the machine and pipes. 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 (fig. 11) 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.10)
- Start the machine again so that the water in the hopper is pumped
through the pipelines to remove all residue.
35
FIG 9
- Before disconnecting the jet or pipelines, ensure that
FIG 10