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5.2 ORDINARY MAINTENANCE
5.2.1 OVERCURRENT PROTECTION DEVICES CHECK
The Overcurrent protection devices must be inspected to check their integrity and functionality.
Replace fuses only after the unit is disconnected from the power supply, turning the main switch to OFF position.
It is forbidden by-passing the fuses used in the unit, or replacing them with bigger ones.
Fuses can reach very high temperatures that can cause burns, if not carefully handled.
Blade -type fuses, used with high current values, must be replaced using the special handle provided with the unit. The use of unsuitable tools,
can damage device and operator.
If adjustable devices (thermal relays and motors protection) are installed, verify that the set absorption value is not higher than the one on the Identication
Tag of the component to be protected.
5.2.2 CONTACTORS CHECKS
Contactors used to activate electrical loads must be checked to verify their integrity, contacts condition and the coil functionality. Also verify that electrical cables
are strongly and rightly connected to their terminals. If required, remove dust and debris which can cause a noisy and unreliable operation of the device.
ACTIONS
FREQUENCY
Daily Monthly Every 2 months Every 6 months Once a year Every 5 years If required
ELECTRICAL SYSTEM AND CONTROL DEVICES
Check that the unit works properly and that
there are no alarms
X
Visually inspect the unit
X
Check unit noise and vibration
X
Check safety devices and interlocks
X
X
X
X
X
X
X
X
X
X
X
X
X
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