Three-phase squirrel cage induction motors in flameproof enclosure type ASA and E2-ASA
frame size 63 – 355
close the terminal box mounting the cover
Warning !
The terminal boxes must always be tightly closed during motor
operation.
6.6 Connection to earth terminal
Is made by means of low resistivity multicore cable in accordance with
labor safety rules. Apropriate conventional symbols indicate the location of
the earth terminals on the housing.
To connect the protection lead to the earth terminal, the user should take
off the screw and the washers, clean to white metal the contact surface,
apply a thin layer of conductible grease (e.g. copper grease) then connect
the lead fastening the screw.
6.7 Overload
protection
The user should protect the motors against overload currents exceeding
the rated curent values indicated on the rating plate.
According to EN 60079-14 chapter 7, the overload protective device shall
be :
- a current-dependent, time lag protective device monitoring all three
phases, set at not more than the rated current of the machine, which will
operate in 2 h or less at 1,20 times the set current and will not operate
within 2 h at 1,05 times the set current
- another equivalent device
6.8
Checking the mounting accuracy
Before connecting the motor to the supply network it is recommended to
check whether:
6.8.1
All fixing parts are tightened
6.8.2
Coupling with the driven equipment is correct
All screws and electric contact nuts are tightened and earth connection is
correctly made. The folowing torque limits (screw and nut) should not be
exceeded
WARNING!
Screws which become unusable have to be replaced by new
ones of the
same strength class (min.8.8) and type
