Installation And Connection - gefran GEFLEX GFX-M1 Series Operating Instructions And Warnings

This section contains the instructions necessary for
correct installation of the GEFLEX controllers into the
machine control panel or the host system and for cor-
rect connection of the controller power supply, inputs,
outputs and interfaces.
Before proceeding with installation read the fol-
lowing warnings carefully!
Remember that lack of observation of these war-
nings could lead to problems of electrical safety
and electromagnetic compatibility, as well as inva-
lidating the warranty.
Electrical power supply
• the controller is NOT equipped with an On/Off switch:
the user must provide a two-phase disconnecting switch that
conforms to the required safety standards (CE marking), to
cut off the power supply upstream of the controller. The switch
must be located in the immediate vicinity of the controller and
must be within easy reach of the operator. One switch may
control more than one controller.
• if the controller is connected to NOT isolated electrical
equipment (e.g. thermocouples), the earth connection must
be made with a specific conductor to prevent the connection
itself from coming directly through the machine structure.
• if the controller is used in applications with risk of damage to
persons, machinery or materials, it is essential to connect it
up to auxiliary alarm equipment. It is advisable to make sure
that alarm signals are also triggered during normal operation.
The controller must NOT be installed in flammable or explo-
sive environments; it may be connected to equipment opera-
ting in such atmospheres only by means of appropriate and
adequate types of interface, conforming to the applicable
safety standards.
Notes Concerning Electrical Safety and Electroma-
gnetic Compatibility:
• CE MARKING: EMC Conformity (electromagnetic
compatibility)
in accordance with EEC Directive EMC 2004/108/CE.
Series GEFLEX controllers are mainly designed to operate
in industrial environments, installed on the switchboards or
control panels of productive process machines or plants. As
regards electromagnetic compatibility, the strictest gene-
ric standards have been adopted, as indicated in the table
below.
• BT Conformity (low tension)
in accordance with Directive 2006/95/CE.
EMC conformity has been tested with the following connections
(table 1).
80331F_MHW_GFX-25/120A_05-2014_ENG
2 • INSTALLATION AND CONNECTION
Advice for Correct Installation for EMC
Instrument power supply
• The power supply to the electronic equipment on the switch-
boards must always come directly from an isolation device
with a fuse for the instrument part.
• The electronic instruments and electromechanical power devi-
ces such as relays, contactors, solenoid valves, etc., must
always be powered by separate lines.
• When the electronic instrument power supply is strongly
disturbed by the commutation of transistor or power units or
motors, an isolation transformer should be used for the con-
trollers only, earthing the screen.
• It is essential that the plant has a good earth connection:
- the voltage between neutral and earth must not be > 1V
- the Ohmic resistance must be < 6W;
• If the mains voltage fluctuates strongly, use a voltage
stabilizer.
• In the proximity of high frequency generators or arc welders,
use adequate mains filters.
• The power supply lines must be separate from the instrument
input and output ones.
Inputs and outputs connection
• The externally connected circuits must be doubly isolated.
• To connect the analogue inputs (TC, RTD) the following is
necessary:
- physically separate the input cables from those of the power
supply, the outputs and the power connections.
- use woven and screened cables, with the screen earthed in
one point only.
• To connect the regulating and alarm outputs (contactors,
solenoid valves, motors, fans, etc.), fit RC groups (resistance
and condensers in series) in parallel to the inductive loads
that operate in Alternating Current.
(Note: all the condensers must conform to VDE (class X2)
standards and withstand a voltage of at least 220V AC.
The resistances must be at least 2W).
• Fit a 1N4007 diode in parallel with the coil of the inductive
loads that operate in Direct Current.
GEFRAN S.p.A. declines all responsibility for any
damage to persons or property caused by tam-
pering, neglect, improper use or any use which
does not conform to the characteristics of the
controller and to the indications given in these
Instructions for Use.
3