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Electrical connection
Pay attention to safety rules during service or repair work! Consider applicable laws, standards,
directives and possible new regulations before placing back into operation.
Use only new original parts when replacing old ones (e.g. cable screw connections).
Operate the electrical system only in an undamaged and clean condition; have it
checked and serviced at regular intervals by trained personnel.
Carefully make conductor connections so that individual wires are not damaged.
Properly prepare conductor ends of multiple-wire or fine-wire cables. Crimp wire end sockets only
with suitable compression tools to achieve uniform quality. Ensure a secure connection of all termi
-
nal locations!
Check installation before start-up.
The accompanying INT69 EX2 release unit must be installed corrosion-free in the external switch
cabinet outside the explosion-endangered area. Max. sensor cable length 30 m. Wire the release
unit as the first member in the control power circuit and protect it with a fuse that is rated no larger
than the smallest maximum permissible current of the installed component
.
When installing control and regulating parts, the respectively valid national regulations for Ex pro
-
tection must be observed!
When using the 24 V DC control voltage version of the Motor Protection Unit INT69 EX2, a protection
class 3 (SELV or PELV) safety transformer must be installed in series. The safety transformer must
conform to EN 60950-1.
5.8 Electronic trigger unit INT69 EX2
ATTENTION Install INT69 EX2 outside the explosion-endangered area.
The INT69 EX2 trigger unit must be installed according to the wiring
diagram.
INFO
The relay switching output is executed as a floating changeover
contact. This electrical circuit operates according to the quiescent
current principle, i.e. the relay drops into a the idle position and
deactivates the motor contactor even in case of a sensor break or
open circuit.
The hot gas sensors of the cylinder cover and the temperature sensors of the motor are observed by
the electronic trigger unit INT69 EX2. In case of excess temperature in the motor winding and/or in
the hot gas, the INT69 EX2 deactivates the motor contactor. Once cooled, it can be restarted only if
the electronic lock of the output relay (terminals 1+2) is released by a mains reset > 5 sec
.
The INT69 EX2 fulfills the requirements of the IPL 1 (Ignition Prevention Level) as prescribed in the
EN 80079-37 and has an appropriate EX identification.
The unit trips when an overload or inadmissible operating conditions occur. Find and remedy
the cause.
WARNING
With the 24 V DC version of the INT69 EX2 triggering unit there is no
galvanic separation between small voltages and current supply. For
this reason, appropriate measures against electrical shock must be
provided, also for the current supply unit and further components
that are connected directly with the power supply if users can have
access to them.
