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This section contains the instructions needed for
correct installation of GFX4 controllers on the
machine/host system control panel and for correct
connection of the power supply, inputs, outputs and
interfaces.
CAREFULLY READ THE FOLLOWING WARNINGS BEFORE
INSTALLING THE INSTRUMENT!
Disregard of such warnings could create electrical
safety and electromagnetic compatibility problems,
as well as void the warranty.
2.1
E
lectrical power supply
• the controller DOES NOT have an On/Off switch: the user
must install a 2-phase switch/isolator conforming to safety
requisites (CE mark) to cut off the power supply up-line of the
controller.
The switch must be installed in the immediate vicinity of the
controller in easy reach of the operator.
A single switch can be used for multiple controllers.
• if the controller is connected to devices that are NOT
electrically isolated (for example, thermocouples), the ground
connection must be made with a specific conductor and NOT
via the machine structure.
• if the controller is used in applications with risk of harm to
persons or damage to machines or materials, it MUST be
equipped with auxiliary alarm devices.
It is advisable to provide the ability to check for tripped alarms
during regular operation.
DO NOT install the controller in rooms with hazardous
(inflammable or explosive) atmosphere; it may be connected
to elements that operated in such atmosphere only by means
of appropriate interfaces that conform to current safety
standards.
2.2
N
otes on electrical safety anD
electromagnetic compatibility
2.2.1
CE MARK: EMC
(electromagnetic compatibility) conformity
in compliance with Directive EMC 2004/108/CE.
Series GFX4 controllers are mainly intended for industrial
use, installed on panels or control panels of production
process machines or systems.
For purposes of electromagnetic compatibility, the most
restrictive generic standards have been adopted, as shown
on the table
2.2.2
LV (low voltage) conformity
in compliance with Directive 2006/95/CE
EMC conformity has been verified with the connections
indicated on table 1.
80395G_MHW_GFX4_09-2010_ENG
2 • INSTALLATION AND CONNECTION
:
Recommendations for Correct Installation for purposes
of EMC
2.3
I
nstrument power supply
•
The power supply for the electronic instrumentation on the
panels must always come directly from a cut-off device with
fuse for the instrument part.
•
Electronic instrumentation and electromechanical power
devices such as relays, contactors, solenoids, etc., MUST
ALWAYS be powered by separate lines.
•
When the power supply line of electronic instruments is
heavily disturbed by switching of thyristor power groups or
by motors, you should use an isolation transformer only for
the controllers, grounding its sheathing.
•
It is important for the system to be well-grounded:
- voltage between neutral and ground must not be > 1V
- Ohmic resistance must be < 6Ω;
•
If the grid voltage is highly unstable, use a voltage stabilizer.
•
In proximity of high-frequency generators or arc welders,
use adequate grid filters.
•
The power supply lines must be separate from instrument
input and output lines.
•
Supply from Class II or from limited energy source
2.4
I
nput anD output connections
•
Connected outside circuits must be doubly isolated.
•
To connect analog inputs, strain gauges, linears, (TC,
RTD), you have to:
- physically separate the input cables from those of the
power supply, outputs, and power connections.
- use braided and shielded cables, with sheathing grounded
at a single point.
•
To connect the control outputs and alarm outputs (contac-
tors, solenoids, motors, fans, etc.), install RC (series of
capacitors and resistors) groups parallel to inductive loads
that work in AC.
(Note: all condensers must conform to VDE standards
(class X2) and support voltage of at least 220Vac.
Resistances must be at least 2W).
•
Install a 1N4007 diode parallel to the coil of inductive loads
that work in DC.
GEFRAN S.p.A. assumes no liability for any
damage to persons or property deriving from
tampering, from incorrect or improper use, or
from any use not conforming to the characte-
ristics of the controller and to the instructions in
this User Manual.
Appropriate devices must be provided: fuses
or automatic switches to protect power lines.
The fuses present in the module function solely
as a protection for the GFX4 semiconductors.
3
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