INSTRUCTION, USE AND
MAINTENANCE MANUAL
GB
Page 8 of 96
7522-M004-1_B
NAV51.15 - NAV51T.15 - NAV51.15N
3.0 SAFETY DEVICES
PERIODICALLY, AT LEAST MONTHLY, CHECK THE INTEGRITY AND THE FUNCTIONAL-
ITY OF THE SAFETY AND PROTECTION DEVICES ON THE MACHINE.
All the machines are equipped with:
• “man-operated” controls (immediate stop of operation when the control is released);
•
controls logic disposition:
to prevent the operator from making dangerous mistakes;
• thermal magnetic switch on the supply line of the oil-pressure power unit motor: it avoids the motor over-
heating in case of intensive use (only NAV51.15 - NAV51T.15);
NO MODIFICATION OR CALIBRATION OF THE OPERATING PRESSURE OF THE MAXI-
MUM PRESSURE VALVE OR OF THE HYDRAULIC CIRCUIT PRESSURE LIMITER IS
PERMITTED
• controlled check valves on:
- opening of mandrel jaws;
- mandrel arm lifting;
- tool holder arm tilting (only for versions foreseeing such operation).
These valves have been fit in order to avoid unexpected movements of the jaws, tool or mandrel arm (and,
as a consequence, the wheel fall) caused by accidental oil drippings;
• fuses on the electric supply line of the mandrel motor;
• automatic power supply disconnection with the opening of the electric panel;
• mandrel driven by brake motor (on demand);
•
Motor protection devices (version with inverter)
The new “Invemotor” unit is equipped with electronic protection devices. They stop the motor if working
defected conditions appear to avoid that the motor itself can be damaged and that the operator safety can be
compromised (overvoltage, undervoltage, overload, overtemperature).
For more details, see Chapt. 14 “Troubleshooting table”.
•
fixed protections and guards.
The machine is fitted with a number of fixed guards intended to prevent potential crushing, cutting and
compression risks.
These protections have been realized after risks evaluation and after all machine operative situations have
been considered.
These protections can be located in the figure below.
Fig. 3
