Lumel RE82 User Manual

Lumel RE82 User Manual Manual pdf 34 page image

34- change of the set point value – after the configuration of twoinputs, one for decreasing and one for decreasing the set point va-lue, one can replace the change by upward and downward push-buttons for changing through binary inputs,- switching SP on IN2 - change the set point value during the con-trol between the SP and the value of the additional input (sPmdparameter must be set to sPin, the other binary input cannot haveset the function switching SP on SP2).7.4. OutputsThe controller has four outputs. Each of them can be configu-red as a control or an alarm output.For the proportional control (with the exception of analog outputs),the pulse period is set additionally.The pulse period is the time which goes by between successive swit-ches of the output during the proportional control. The length of thepulse period must be chosen depending on dynamic object propertiesand suitably for the output device. For fast processes, it is recommendedto use SSR relays. The relay output is used to steer contactors in slow-changing processes. The application of a high pulse period to steer fast-changing processes can give unwanted effects in the shape of oscilla-tions. In theory, lowest the pulse period, better the control, but for a relayoutput it can be as large as possible in order to prolong the relay life.Recommendations concerning the pulse period: Table 3Output Pulse period LoadElectromagneticrelayRecommended >20 s,min. 10 s 2 A/230 V a.c.min. 5 s 1 A/230 V a.c.Transistor output 1...3 s SSR relay