4 HANDLING
4-9
4.3.3 Contact output modules (LQY100, LQY140, LQY150, LQY160, LQY170)
(1) Surge
absorber
Where a contact output module drives an L-load, a fly-back voltage could be generated
upon on-to-off transitions, causing noise to occur. If an L-load is used, the installation
of a surge absorber like that explained below is recommended.
* The installation of a surge absorber is required for driving an L-load from a DC power
supply.
(2) Relay contact life
The relays used for the contact output module have life.
If these relays are intended to be operated at rated voltage and rated current, their
expected service life is approximately 100,000 switching operations (*) (1,800 cycles per
hour). However, if the relays are operated at a higher voltage and a higher current level
than the rated, their useful service life will be shorter than expected. The other factors
that will make the service life shorter than expected are the following: ambient operating
environment, type of the load connected, in-rush current, and serge. So, pay special
attention to those factors when installing any of the above-mentioned hardware modules.
As a rule, each of these factors should be checked before using the hardware module to
which a load is actually connected, or the hardware module should be replaced regularly
before its service life is over. It is recommended that, where a long service life is
required of a hardware module, the hardware module should be a transistor output
module or triac output module, not a hardware module containing a relay for output.
(*) The expected service life of the model LQY100 and LQY140 relay DO module is
approximately 70,000 switching operations.
Содержание S10mini LQS070
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