Each manufacturer's instrument and system has each
concept, therefore, it is matter of course that interactions may happen
if these systems are connected directly without any isolator units
between them. With isolator units installed, it is not necessary for
you to consider interactions which could come from different systems.
In some cases, the whole system as total does not function properly
even though each independent instrument is working correctly. There
we have to consider noise influence on signal transmission lines.
When there are machines operated by high voltage in the field, an
AC common mode voltage (vs. ground) sometimes appears on the signal
lines due to the magnetic field created by these machines. In case
this common mode voltage is less than permissible value of the receiver
instrument, the operation of the instrument becomes unstable. The
simplest solution to prevent this common mode noise problem is to
install an isolator unit on the signal transmission line. |
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Our
system consists of various manufacturers' instruments, and sometime we meet
errors of unknown origin. Each manufacturer of the system says their part
of system has no problem. Any idea?
Most
of this kind of problems will be solved by installing isolator units (M-System
model: M2VS, etc.) between each system. In addition, by installing isolator
units, the responsibility of each manufacturer's system will be clarified
easily.