Overview
2
TI08 is an economical 4-digit programmable
process indicator / trip alarm unit
with an input for linear current, voltage, or
resistive signals. The device can be ordered
with up to 2 relay outputs and for mains
or low-voltage AC/DC supply.
Mounting
♦ Place TI08 into an appropriate
panel cut-out.
♦ Tighten it into place using the enclosed
mounting bracket(s).
Electro-Magnetic Interference (EMI) Issues
Important note:
A built-in RC noise
suppression circuit may
be connected in parallel
with relay contacts.
Full AC voltage isolation
may NOT be provided
when relay contacts
are open.
Small AC current
(≈ 1.5 mA at 230 VAC)
may still flow through
the RC circuit!
♦ All signal wires must be shielded.
They must not be packaged together
with power cables!
♦ Never lay the signal wires close
to inductive or capacitive noise sources,
such as relays, contactors, motors, etc.!
♦ All shields have to be grounded ONLY
at one end, as closer as possible
to the indicator terminals!
♦ Avoid sharing supply lines with powerful
consumers, especially with inductive loads,
switched on and off.
♦ To stop unwelcome interference signals
entering through the power supply lines,
use shielded 1:1 isolation transformer!
♦ Shunt all switched (not only those switched
by the indicator) inductive consumers
with special suppression networks:
RC group and varistor - for AC loads,
or diode - for DC loads.
♦ If the indicator operates in a very powerful
EMI area, it has to be mounted inside
a grounded metal shielding box!
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