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2. INSTALLATION
2.2.
Connections
Attention! Failure to follow the instructions in this
section may cause problems in electrical safety and
electromagnetic compatibility, in addition to voiding
the warranty.
2.2.1.
General considerations
1.
Connected external circuits must be isolated for both
single and differential inputs.
2.
When using shielded cables, the shield must be groun-
ded at a single end point, preferably at the instrument
end.
3.
Input cables must be physically separated from power
cables, output cables, and power connections.
4.
Do not connect unused terminals.
5.
Do not overtighten connection terminals. The recom-
mended torque is 0.5 Nm.
6.
When making connections,manitain proper polarity
where required.
7.
Do not bend or twist the cables
8.
After connecting the cables, install the transparent co-
ver to protect the terminals. The terminal teeth ensure
the correct orientation of the cover.
2.2.2.
Electromagnetic compatibility (EMC)
For electromagnetic conformity, the strictest general rules
have been applied, using the following test configuration:
Cable
Connection
section
Power supply
1 mm
Relay
1 mm
Serial port
0,35 mm
Thermocouple
0,8 mm
Potentiometer,
linear, "PT100"
1 mm
resistance
thermometer
Digital input/
1 mm
outputs
2.2.3.
Cables
Always use cables appropriate for the voltage and current
limits specified in the Technical Characteristics.
Use copper cables with 60/75°C insulation.
Use twisted and shielded cables for non-power connections.
The instrument's terminal board has screw terminals (M3)
that accept stripped cables and crimped terminals for a ti-
ghtening torque of 0.5 N m.
Two ring or crimped fork terminals can be connected on
each terminal
The following table shows the characteristics of the cables
and terminals that can be used.
Length
(17 AWG)
1 m (39.37")
2
(17 AWG)
3,5 m (137.79")
2
(21 AWG)
3,5 m (137.79")
2
5 m (196.85")
(18 AWG)
2
compensated
(17 AWG)
3 m (118.11")
2
(17 AWG)
3,5 m (137.79")
2
80224_MHW_650 L - 1250 L_07-2018_ENG - 14
Cable / terminal
Rigid cable
Twisted
Tag terminal
(to be crimped)
Fork terminal
(to be crimped)
Ring terminal
(to be crimped
Attention! Tie the cables, in pairs, to prevent ben-
ding at the terminal connections.
2.2.4.
Power supply
Attention! Before powering the instrument, make
sure that the supply voltage matches the one
shown on the instrument data plate.
Because the instrument does not have a switch, a discon-
nect and fuse must be inserted ahead of the device. The di-
sconnect, or isolator, must be positioned near of the device
and must be easily reached by the operator.
A single disconnect can control multiple instruments.
The instrument must be powered by a line separated from
the one used for electromechanical power devices (relays,
contactors, solenoids, etc).
It is recommended to install a ferrite core on the power line,
as close as possible to the device, to limit the instrument's
susceptibility to electromagnetic noise.
If the instrument's power line is heavily disturbed by noise,
it is advisable to use an isolation transformer only for the
instrument, grounding the shield.
Use appropriate line filters when near high-frequency gene-
rators or arc welders.
Use a voltage stabilizer if there are wide shifts in line voltage.
20...27 VAC/VDC models must be powered by a class II or
low-voltage limited-energy source.
The power supply must use a line separated from the one
used for electromechanical power devices, and low-voltage
power cables must run along a path separated from the sy-
stem or machine power cables.
Attention! Make sure the ground connection is effi-
cient. Absent or inefficient grounding can make the
device unstable due to excessive noise.
Specifically, check that:
• voltage between object and ground is < 1 V;
• resistance is < 6 Ω.
Cable / terminal
Terminal size
section
0,2...2,5 mm
2
(24...14 AWG)
0,2...2,5 mm
2
(24...14 AWG)
0,25...2,5 mm
2
(23...14 AWG)
5,8 mm max
(0.23")
5,8 mm max
(0.23")
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