Hardware
Installing
Y
our Controller
1–9
Suitable sur
ge suppression methods for inductive ac load devices include a varistor
,
an RC network, or an Allen-Bradley sur
ge suppressor
, all shown below. These
components must be appropriately rated to suppress the switching transient
characteristic of the particular inductive device. See the table on page 1–10 for
recommended suppressors.
Output Device
Varistor
Output DeviceOutput Device Output Device
RC Network
Surge
Suppressor
Surge Suppression for Inductive ac Load Devices
If you connect a micro controller triac output to control an inductive load, we
recommend that you use varistors to suppress noise. Choose a varistor that is
appropriate for the application. The suppressors we recommend for triac outputs
when switching 120V ac inductive loads are a Harris MOV
, part number V175
LA10A, or an Allen-Bradley MOV, catalog number 599-K04 or 599-KA04.
Consult the varistor manufacturer’s data sheet when selecting a varistor for your
application.
For inductive dc load devices, a diode is suitable. An 1N4004 diode is acceptable
for most applications. A sur
ge suppressor can also be used. See the table on
page 1–10 for recommended suppressors.
As shown in the illustration below
, these sur
ge suppression circuits connect directly
across the load device. This reduces arcing of the output contacts. (High transient
can cause arcing that occurs when switching of
f an inductive device.)
Output Device
Output Device
Diode
(A surge suppressor can also be used.)
—
+
Surge Suppression for Inductive dc Load Devices
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