GEA pluscom Bock EX-HG12P, Assembly Instructions Manual, Page: 24 / 44

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5 | 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 che-
cked and serviced at regular intervals by trained personnel.
Carefully make conductor connections so that individual wires are not damaged. Pro-
perly 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 terminal 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 protection 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.
5.6 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 compressor motor is fitted with cold conductor temperature sensors (PTC) con-
nected to the electronic trigger unit INT69 EX2. In case of excess temperature in the motor
winding, 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 hot gas side of the compressor is also protected against overtemperature using thermal protec-
tion thermostats (accessory). The INT69 EX2 fulfills the requirements of the IPL 1 (Ignition Prevention
Level) as prescribed in the EN 80079-37.
The unit trips when an overload or inadmissible operating conditions occur. Find and remedy
the cause.
WARNING With the 24V 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.