Specifications

31
Electrical Connection
Cables
Extension cables for SENC
ACU-RITE linear encoders feature cables
with D-sub connector for direct connection
to ACU-RITE digital readouts. The exact
length of the cable can be found in the
Specifi cations. If the cable length is
Extension cables Length In metal armor Without metal armor
Complete with D-sub
connectors (female and male)
1.5 m
3.0 m
4.5 m
6.0 m
7.5 m
683 276-05
683 276-10
683 276-15
683 276-20
683 276-25
683 277-05
683 277-10
683 277-15
683 277-20
683 277-25
are sent through the connecting element
require specifi c measures regarding
electrical safety and EMC.
Connect the housings of the encoder, •
connecting elements and subsequent
electronics through the shield of
the cable. Ensure that the shield has
complete contact over the entire surface
(360°). For encoders with more than one
electrical connection, refer to the
documentation for the respective
product.
For cables with multiple shields, the inner •
shields must be routed separately from
the outer shield. Connect the inner shield
to 0 V of the subsequent electronics. Do
not connect the inner shields with the
outer shield, neither in the encoder nor
in the cable.
Connect the shield to protective ground •
as per the mounting instructions.
Prevent contact of the shield (e.g. •
connector housing) with other metal
surfaces. Pay attention to this when
installing cables.
Transmission of measuring signals—
electrical noise immunity
Noise voltages arise mainly through
capacitive or inductive transfer. Electrical
noise can be introduced into the system
over signal lines and input or output
terminals.
Possible sources of noise include:
Strong magnetic fi elds from •
transformers, brakes and electric motors
Relays, contactors and solenoid valves•
High-frequency equipment, pulse •
devices, and stray magnetic fi elds from
switch-mode power supplies
AC power lines and supply lines to the •
above devices
Protection against electrical noise
The following measures must be taken to
ensure disturbance-free operation:
Use only original ACU-RITE cables. •
Consider the voltage attenuation on
supply lines.
Use connecting elements (such as •
connectors or terminal boxes) with metal
housings. Only the signals and power
supply of the connected encoder may
be routed through these elements.
Applications in which additional signals
Do not install signal cables in the direct •
vicinity of interference sources (inductive
consumers such as contactors, motors,
frequency inverters, solenoids, etc.).
– Suffi cient decoupling from
interference-signal-conducting cables
can usually be achieved by an air
clearance of 100 mm or, when cables
are in metal ducts, by a grounded
partition.
– A minimum spacing of 200 mm to
inductors in switch-mode power
supplies is required.
If compensating currents are to be •
expected within the overall system, a
separate equipotential bonding
conductor must be provided. The shield
does not have the function of an
equipotential bonding conductor.
Provide power only from PELV systems •
(EN 50 178) to position encoders.
Provide high-frequency grounding with
low impedance (EN 60 204-1 Chap.
EMC).
General Electrical Information
insuffi cient, extension cables are offered
complete with connectors.
Upon request you can also order adapter
cables for connection to discontinued
ACU-RITE products.