User manual TELEFUNKEN DIAMOND DPF 9332 WIFI

[. . . ] 1 - Front panel Temperature alarm with relative thresholds, refrigerating control (ATM=REL, 1CH=REF) ATM=ABS Temperature alarm with relative thresholds, heating control (ATM=REL, 1CH=HEA). see table of input specifications Measurement accuracy Operating conditions ATM=REL ■■ The DIAMOND DPF 9332 WIFI sizes 110x75x55 mm (WxHxD). Fix the plate to the panel using 2 cheese-headed screws with 4 or 5 mm diameter and then apply the instrument casing to the plate. This should be done for vertical panels and for correct positioning of the instrument with the outlets at the bottom. [. . . ] To reduce the effects of electromagnetic disturbance, keep the sensor and signal cables well separate from the power wires. – â–  Place the probe T1 inside the room in a point that truly represents the temperature of the stored product. Remains inactive for 1T0 minutes regardless of the The information available in this menu is: Maximum temperature recorded Minimum temperature recorded Keypad state lock 0. After output 1 has been turned on, it remains active for 1T1 minutes regardless of the temperature value measured. Temperature control takes place by changing the ON time of the output: the closer the temperature to the setpoint, the less time of activation. A small proportional band increases the promptness of response of the system to temperature variations, but tends to make it less stable. A purely proportional control stabilises the temperature within the proportional band but does not cancel the deviation from setpoint. 9 Minimum range value (in the models DIAMOND DPF 9332 WIFIA… only) RLO takes the minimum value measured by the transmitter (i. Maximum range value (in the models DIAMOND DPF 9332 WIFIA… only) RHI takes the maximum value measured by the transmitter (i. The value matching 1V) Delay for minimum temperature (TLO) and maximum temperature (THI) logging. – â–  To exit from the menu, press button or wait for 10 seconds. In case of power failure, when power is resumed, after the initial autotest phase, the controller resumes the autotuning function. To abort the autotuning, without modifying the previous control parameters, keep button pressed for 3 seconds. After the autotuning has taken place successfully, the controller updates the control parameters and start to control. Errors If the autotuning function failed, the display shows an error code: ■■ E1 timeout1 error: the controller could not bring the temperature within the proportional band. increase 1SP in case of heating control , vice versa , decrease 1SP in case of refrigerating control and re-start the process. – â–  E2 timeout2 error: the autotuning has not ended within the maximum time allowed (1000 cycle times). – â–  E3 temperature overrange: check that the error was not caused by a probe malfunction, then decrease 1SP in case of heating control, vice versa increase 1SP in case of refrigerating control and then re-start the process. – â–  To eliminate the error indication and return to the normal mode, press button . Control improvement ■■ To reduce overshoot, reduce the integral action reset 1AR ■■ To increase the response speed of the system, reduce the proportional band 1PB. – â–  To reduce swings in steady-state temperature, increase the integral action time 1IT; system stability is thus increased, although its response speed is decreased. – â–  To increase the speed of response to the variations in temperature, increase the derivative action time 1DT. [. . . ] – â–  To increase the speed of response to the variations in temperature, increase the derivative action time 1DT. Caution: a high value makes the system sensitive to small variations and it may be a source of instability. 100% Reset of integral action time referred to 1PB Decreasing the parameter 1AR reduces the integral control action zone, and consequently the overshoot (see figure on paragraph 1IT). The quicker the system to be controlled reacts to temperature variations, the smaller the cycle time must be, in order to obtain higher temperature stability and less sensitivity to load variations. [. . . ]