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 1/5 – 1/10 of derivative time. (It should be integer times of
0.5 second.)
When the parameter OPt or Aut = 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.
When the parameter CtrL = onoF, CtI will used as timer to make delay time to avoid
the power restart in short period. It suit for compressor protection.
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