8-CHANNEL SCANNER-8208
REF NO: m82A/om/101
masibus
Issue NO: 08
User‟s Manual Page 7 of 42
How to connect wires:
Before carrying out wiring, turn off the power to the
controller and check that the cables to be connected are not alive with
a tester or the like because there is a possibility of electric shock.
NOTE:
o All wiring must confirm to appropriate standards of good practice and
local codes and regulations. Wiring must be suitable for Voltage,
Current and temperature rating of the system.
o Provide power from a single-phase instrument power supply. If there
is a lot of noise in the power line, insert an insulating transformer into
the primary side of the line and use a line filter on the secondary side.
Do not place the primary and secondary power cables close to each
other.
o For thermocouple input, use shielded compensating lead wires for
wiring. For RTD input, use shielded wires that have low conductor
resistance and cause no significant differences in resistance between
the three wires. Do not connect Terminal NO – 13,
16,19,22,37,40,43,46 when thermocouple or linear input is selected.
o Use repeater after each set of 32 instruments connected in RS-485
Communication.
o Unused terminals should not be used as jumper points as they may be
internally connected, which may cause damage to the unit.
CAUTION:
High voltage transients may occur when switching inductive loads such
as some contactors or solenoid valves. Through the internal contacts,
these transients may introduce disturbances which could affect the
performance of the instrument.
For this type of load it is highly recommended that a “sunbber” is
connected across the normally open contact of the relay switching
though load. The sunbber recommended consists of a series connected
resistor/capacitor (typically 15nF/100 Ohms). A sunbber will also
prolong the life of the relay contacts. A sunbber should also be
connected across the output of a tric output to prevent false triggering
under line transient conditions
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