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Mains connection of explosion-protected motors
Besides any general installation regulations, follow carefully EN 60079-14
and EN 50281-1-2. Afterwards suitable overload protection is to be provided
either with a motor circuit breaker or similar protective devices. These may
include also PTC thermistors with tripping devices (
Î Section "Motors with
temperature monitoring“, page 25). These must be specified on the rating
plate together with a tripping time t
A
.
In addition, any "Special Requirements" specified in the test certificate are to
be complied with. These are marked with an "X" after the test certificate
number on the rating plate.
Motors with direct line lead-in
The free end of the cable inserted in the motor must be connected according
to the regulations in force concerning the connection area. If the line lead-in
used on the motor is provided with pull relief, the cable can be laid freely;
otherwise the cable must be secured with a pull relief device in the near
vicinity.
The maximum operating temperature at the line lead-in must not
exceed 90° C.
Terminal box
Open the box by loosening the screws on the cover (Fig. 5) or, in the case of
models with grub screw (Fig. 6), by turning the grub screw counter-clockwise
and then loosening the tapped cover.
Close the terminal box again after connecting the mains by following the
same instructions in the opposite order.
In order to change the position of the cable and line lead-ins, you can turn
the terminal box by 4
x 90°.
> Loosen either
– the four fastening screws (
ÎFig. 5 ) or
– the anti-rotation pins by means of the grub screw (
Î Fig. 6 ).
> Turn the terminal box to the desired position.
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