Electrical Installation - SICK DAX Threaded Kurzanleitung

2
±5
(0.20)
1
50
(1.97)
3
Figure 7: Dimensions and distances for MAG-B-180-xx position magnet on DAX®
Slider
Nominal distance + permissible amount of distance tolerance
1
Permissible center offset
2
Recommendation: M5 x 20
3
Misalignments are compensated for via the air gap.
• Surface pressure of the position magnet: Type-dependent, see the technical
data of the position magnet used.
• Tightening torque for the M4 screws: Max. 1 Nm, use washers if necessary.
CAUTION
Mount the C-magnets concentrically.
Mount the block magnets centered over the linear encoder profile. Do not
exceed the maximum permissible air gap. Install the sensor so that the sen‐
sor rod/linear encoder profile is aligned parallel to the direction of movement
of the position magnet. In this way, you avoid damage to the magnet driver,
magnet, and linear encoder profile.
≥ 15 mm ≥ 15 mm
1 1
Figure 8: Minimum distance between position magnets and parts made of mag‐
netizable material
Minimum distance between position magnets and parts consisting of
1
magnetizable material
≥ 15 mm ≥ 15 mm
1 1
Figure 9: Minimum distance between position magnets and parts made of mag‐
netizable material
Minimum distance between position magnets and parts consisting of
1
magnetizable material
3.2.3 Using multiple position magnets on one linear encoder
• Two position magnets can only be selected for nominal measuring range
lengths ≥ 100 mm.
• The distance between two position magnets must be ≥ 50 mm.
Figure 10: DAX® Slider with C-magnet (MAG-C-250-01)
≥50
Figure 11: DAX® Slider with slider magnet
8028139/1LXF/2023/12/01/de, en
≥50
(1.97)
(1.97)
Figure 12: DAX® Slider with block magnet
≥50
(1.97)
Figure 13: DAX® Low Profile with block magnet
CAUTION
If the minimum distance between two magnets specified above is not
adhered to, a valid position value cannot be guaranteed.
4

Electrical installation

The installation location and cabling have a significant influence on the electro‐
magnetic compatibility (EMC) of the linear encoder. Correct connection of this
active electronic system, and the EMC of the overall system must be assured
by means of suitable connectors, a shielded cable, and grounding. Overvoltages
or incorrect connections can damage the electronics despite reverse polarity
protection.
NOTE
1 Do not mount the sensors in the area of strong magnetic and electric
interference fields.
2 Never connect or disconnect the sensor while it is live.
Connection instructions
Use low impedance, twisted pair and shielded cable. Connect the shield
externally in the control unit to ground.
Lay the control and signal lines spatially separated from power cables and
away from motor lines, frequency converters, valve lines, switching relays,
etc.
Use only metal connectors. Place the shield on the connector housing.
Place shields on both cable ends over a large area and the cable clamps on
functional earth.
Make earth connections short and with a large cross-section. Avoid earth
loops.
In the event of potential differences between the ground connection of the
machine and the electronics, no equalizing current must flow across the
shield.
Recommendation: Use a equipotential bonding line with a large cross-section.
Use only a stabilized voltage supply. Adhere to the specified connection
values.
Cable laying
Do not lay the cable between the displacement sensor, control unit and voltage
supply near power lines (inductive interference possible).
Particularly critical are inductive interferences caused by mains harmonics (e.g.,
from phase-angle controllers), for which the cable shield offers only little protec‐
tion.
Notes on cable laying
Do not lay the cable between DAX®, the control unit and the voltage supply near
power lines. Lay the cable with strain relief.
Maximum length of cable
DAX with analog interface: max. 30 m.
®
DAX with CANopen® interface: max. 25 m (at 1 Mbaud)
®
Longer cables can be used if external interference fields remain ineffective due to
the structure, shielding and routing.
Magnetic fields
The linear encoder is a magnetostrictive system. Ensure a sufficient distance
between the linear encoder and strong external magnetic fields, otherwise the
measuring system may suffer interference.
4.1 Shielding and earthing
NOTE
Defined earthing
The position sensor and controller should be at the same earth potential.
Shielding
The following instructions must be observed to ensure electromagnetic compati‐
bility (EMC):
Connect the DAX® and controller using a shielded cable. Shielding: braiding
of copper single wires, coverage at least 85%.
Make sure that the shield is applied over a large area on both sides to
ensure the best possible signal quality.
DAX® Connector type: Connect the shield in the plug connector with the
connector housing and ensure that it is flush.
Earthing of profile and rod sensors
Connect the sensor electronics housing to the machine earth via the ground lug
located on the linear encoder.
≥50 (1.97)
DAX® | SICK 11