Ac Output Modules - Toshiba Vm Series Instruction Manual

C.4 AC Output Modules
(1) The AC output module contains a 2A fuse per common terminal. Even if a
load short circuit occurs, the triac is protected by fuse blowout. Note that
when the fuse blows, the triac is also damaged to no small extent. Pay
sufficient attention to make sure that that none of load short circuits or the
like will occur.
(2) If the inductive load is connected to the module, a transient voltage with a
relatively large energy is generated at OFF time. To prevent a malfunction
that may be caused by this surge voltage, the AC output module is
equipped with the CR snubber circuit. If the external wiring is used for
routing, this surge voltage may, however, have an adversely effect on other
signal system. Thus, be sure to install the surge absorbing element in
parallel to the inductive load. (Locate the element in the closest possible
position to the inductive load.)。
(3) The AC output module does not have the zero cross function. OFF-to-ON
change occurs regardless of the phase of the load voltage.
However, at ON-to-OFF change time, the load current changes near zero.
For the load response, also take this into consideration.

AC output modules

Surge absorbing element Varistor, TNR, or Transil (for voltage clamp)
Bidirectional overvoltage absorbing element
the rated voltage of which is 1.2 times more
than the maximum, or peak, voltage
 Snubber (CR) circuit (for high frequency attenuation)
Figure.C.4-1 Connection of inductive load
C.5 Contact Output Modules
Surge absorbing element
L
～
DC resistance of load
(I: Load current peak value in stationary state)
Unified Controller nv series Controller Unit Instruction Manual
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