Delta DT3 instruction sheet Setting of multiple PID sets

c、 Coef and DeadBand are added in the PID parameter for double output (one for heating and one for cooling). Coef refers to the ratio between the first and second portions of output (P parameter of second group =Coef*P, Coef= 0.01~99.99); DeadBand is the overlapping temperature of the P output of the first group and the second group.

¾Set parameter to in 【Initial Setting Mode】

¾To set for heating or cooling control: Select desired output control by parameter in 【Initial Setting Mode】. If no

board is inserted in Output2, selection items are: H1, C1 (H for heating, C for cooling, 1 for output 1). If a board is inserted in

Output 2, selection items are: H1H2, C1H2… H1A2(H for heating, C for cooling, 1 for output 1, 2 for output 2, A for Alarm 3 )

¾Select number of PID sets as running parameter and set PID parameter: Select 0~5, , by parameter in

【Regulation Mode】, then press key to set the selected PID parameter including “SV‘x’”, ”P‘x’”, ”I‘x’”, ”d‘x’”, and ”ioF‘x’”, where ‘x’ is the pre-selected set as the PID running parameter, which can be 0~5. “SV‘x’” is the reference temperature setting value; “P‘x’”, ”I‘x’”, ”d‘x’”, ”ioF‘x’” correspond to P, I, D, and IOF.

¾Set the control period: in parameter【Regulation Mode】, PV displays “o‘x’-‘y’”, ‘x’ is 1(output 1) or 2 (output 2), ‘y’ is H(Heating) or C (Cooling)

¾Set double output Coef: Set Coef value by parameter in 【Regulation Mode】

¾Set DeadBand of double output: Set DeadBand zone by parameter in 【Regulation Mode】

¾Set control to running mode: Set parameter in 【Operation Mode】 to .

¾Set AT: Set parameter to in 【 Regulation Mode】 . The selected number of PID will be adjusted automatically. After that, a pre-set parameter of integrated PID value will be created automatically and the display will

automatically alter into .

Note: When performing AT, the entire system must complete setting; i.e. the input Sensor must be wired and correctly set, and the output must be connected to a heater or cooler pipe.

zMANUAL Mode: Manual control function, may force output of a fixed value; normally operated by combining switchover of PID control.

a、 Switch from PID control to manual control: Control output will maintain the original control output before switching over to manual control. E.g., if the control output before the PID calculation is 20%, then the control output after switching to manual

control is 20%. You may force a fixed output value after a switchover, for example: controlling the output to be 40%. b、 Switch from manual control to PID control: if manual control before switching-over to PID control is 40%, the program will

take 40% as the initial value for calculating the PID value and output the new control.

Note: If power of machine is switched off in manual control mood, the output % will be maintained when the power is switched on again.

¾Set parameter to in 【Initial Setting Mode】

¾Set control period: in parameter 【Regulation Mode】, PV displays “o‘x’-‘y’”, ‘x’ is 1 (output 1) or 2 (output 2), ‘y’ is H (Heating) or C (Cooling)

¾Set output %: in parameter 【Operation Mode】, PV screen displays “oUt‘x’”, ‘x’ is 1 (output 1) or 2 (output 2)

zFUZZY Mode: This comprises 2 parts: PID parameters and Fuzzy exclusive parameters. Since Fuzzy control is calculated based on P.I.D values of PID control, the user must first set P.I.D parameters or perform auto tuning (AT) to produce these parameters. In addition, Fuzzy control includes the following 2 exclusive parameters.

a、 Fuzzy Gain Setting: altering this value will directly affect the calculation of Fuzzy gain. Increasing this value will directly enhance the Fuzzy control; decreasing this value will weaken the Fuzzy control. It is recommended that this value shall be decreased for systems with slow reaction to heating/cooling. This value may be increased for systems with quick reaction to heating/ cooling.

b、 Set Fuzzy DeadBand: The effective bandwidth of Fuzzy control, when PV value enters into the range of SV-FZDB <PV<SV+FZDB, Fuzzy control will stop calculation. I.e., when the PV is within this temperature range, its Fuzzy control is fixed.

¾Set parameter to in 【Initial Setting Mode】

¾Set Fuzzy Gain: Set value of Fuzzy Gain by parameter in 【Regulation Mode】.

¾Set Fuzzy DeadBand: Set value of Fuzzy DeadBand by parameter in 【Regulation Mode】.

Setting of multiple PID sets

When PID control is selected, the system provides 6 sets (PID 0~5) PID parameter sets (P, I, D and IOF parameter) to be selected by the user. In general conditions, one set of PID (P0) is adequate. For different setting values (SV), when the same PID value is not adequate to control the precision, the user may set up multiple sets of PID parameters for the system to automatically switch-over to an applicable PID set.

¾Set only one PID set:

Set parameter to 0 (PID 0, the first set) in【Regulation Mode】, set parameter to ON; at this time, the System starts to

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