ABB TF140DU Betriebsanleitung Seite 8

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Notes
For explosion-proof applications, the efficiency
of the installed protection devices has to be
verified prior to commissioning!
• The protection function of the device is the
thermal overload protection of motors. In case
of an overload trip, the motor is switched off by
opening the NC contact of the electromechanical
overload relay.
• The safe state is an open NC contact of the
device used to control the load contactor.
Mounting and commissioning
The TF140DU may only be replaced by an equivalent
device, marked in accordance with the regulations.
For applications protecting motors in potentially
explosive areas, the device may only be used if it
is configured for "manual reset".
• Setting the rated motor current is done
using the adjusting knob on the front side.
For this purpose, the rated motor current has
to be adjusted on the TF140DU according to the
EC type examination certificate specification
and/or the type plate.
When selecting the overload relay, check its
suitability by means of the trip curves and/or
the trip class. Decisive values are the ratio
between the motor startup current I
rated motor current I , as well as the shortest
N
time t . These values have to be marked in the
E
ATEX certificate of conformity or in the EC type
examination certificate and on the type plate of
the motor. The thermal overload relay must trip
within the time tE. This means that the trip
curve from the cold state has to be below
the coordination point I /I
A
The connecting cables have to be dimensioned
according to the specifications and/or the
applicable standards.
Safety specifications TF140DU
According to DIN EN 50495, the requirements
for a SIL 1 and a HFT = 0 can be placed on
safety equipment for categories 2G and 2D.
The TF140DU thermal overload relay can meet
these requirements if used as a component of the
safety equipment, e.g. in cooperation with a
suitable load contactor.
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and the
A
and the time t .
N E