Meler Cantho, Instruction Manual

Page: 35 / 66

MELTER OPERATION
4-11
MA-5168-ENG ADHESIVE MELTER CANTHO
Start-up and automatic process
The LOGO controller located on the control panel will manage the following
functions:
1. The movement of the cylinder that pushes the adhesive block.
2. Check the level of adhesive in the tank below the roller.
3. The activation/deactivation of the premelter grid and the discharge
valve.
4. The machine’s warnings and alarms.
5. The operating screens, settings, warnings and alarms.
Operation
Movements of the pusher cylinder.
To raise or lower the cylinder, a three-position rotary switch is used. To stop
the cylinder movement at the ends, two magnetic sensors located on the
same cylinder are used.
For the cylinder to operate, the lid in position sensor must be activated.
Provided that the lowering of the piston is activated with the rotary switch (1),
the electrovalve will be activated during 15 seconds and from that moment
onwards, the piston will operate according to whether manual or automatic
mode is selected on the rotary switch (2).
Operation of the piston in AUTOMATIC MODE:
If no level is detected in the roller tank, the electrovalve will be activated to
lower and the discharge valve will open, remaining so until the adhesive level
goes up and covers the tank’s level sensor. At that point, the electrovalve will
deactivate and the discharge valve will close. This cycle will repeat until the
rotary switch is moved to position ‘0’ or up, or you exit automatic mode.
The operation of the piston in MANUAL MODE does not depend on the level
sensor of the roller tank. The piston goes up or down depending on the posi-
tion of the movement switch of the cylinder.
Actions that are common to both operating modes:
1. If the closed lid sensor detection is lost, the cylinder’s electrovalve will
deactivate and the discharge valve will close.
2. If the piston is pushing and stops (for any possible reason), the cylinder
depressurisation electrovalve will be activated for 8 seconds.
3. If the piston activates the lower magnetic sensor (block finished or
chamber without adhesive), it will stop and indicate this situation.
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