Small value can improve control accuracy.
For SSR, thyristor or linear current output, it is generally 0.5 to 3 seconds.
For Relay output or in a heating/refrigerating dual output control system, generally 15
to 40 seconds, because small value will cause the frequent on-off action of
mechanical switch or frequent heating/refrigerating switch, and shorten its service life.
CtI is recommended to be 1/4 – 1/10 of derivative time. (It should be integer times of
0.5 second.)
When output type is set to relay (OPt or Aut is set to rELY), CtI will be limited to more
than 3 seconds. Auto tuning will automatically set CtI to suitable value considering
both control precision and mechanical switch longevity.
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