gefran 2850T, Инструкция по использованию и установке, Страница: 24 / 166

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2. INSTALLATION
80703B_MHW_2850T/3850T_02-2019_ENG
2.2.6. Removing Modules
To remove the modules:
1. pull down lower slide lock to release the module;
2. rotate the module outwards;
3. remove the top part of the module hook from the DIN
rail.
1
2
3
Figure 11 - Removal from DIN rail
2.3. Connections
Warning! Please remember that failing to follow
the instructions below could lead to electrical safe-
ty and electromagnetic compatibility problems, as
well as void the warranty.
2.3.1. General rules for connections
1. The externally connected circuits must have double
insulation.
2. In the case of shielded cables, the shield must be
grounded at one point only, possibly close to the I/O
module group.
3. Input cables must be physically separated from output
ones and the power connections.
4. Do not connect the unused I/O contacts.
2.3.2. Electromagnetic Compatibility (EMC)
The most stringent generic standards were used for elec-
tromagnetic compliance, using the following experimental
configuration:
Connection Cable section Length
Voltage 1 mm
2
(17 AWG)
1 m
(39.37”)
Serial port 0,35 mm
2
3.5 m
(137.79”)
Thermocouple 0,8 mm 2
(18 AWG)
5 m (196.85”)
compensated
Potentiometer, linear,
"PT100" thermistor 1 mm
2
(17 AWG)
3 m
(9.84”)
Digital inputs/outputs 1 mm
2
(17 AWG)
3.5 m
(137.79”)
2.3.3. Cables
Always make connections using cables suited to the volt-
age and current limits specified in the Technical Specifica-
tions.
For connections, use copper wires with insulation for
60/75° C (140/167 °F). For non power connections, do not
use twisted and shielded cables.
Warning! Anchor cables, at least in pairs, so that
the mechanical stresses do not discharge on the
terminal block connections.
2.3.4. Voltage
Warning! Before powering the interface and I/O
module group, make sure that the supply voltage
corresponds to that on the device plates.
The 24 VDC supply must come from a Class II source or
limited energy low voltage. The power supply must use
a separate line from that used for the electromechanical
power devices and low-voltage power cables must follow a
separate path from the plant or machine power cables.
Warning!
Make sure that the grounding connec-
tion is efficient. A missing or ineffective ground
connection can cause unstable device operations
due to excessive environmental disturbances. In
particular, check that:
• the voltage between ground and earth is < 1 V;
• the ohmic resistance is < 6 Ω.