Delta DT3 instruction sheet Control Mode Setting, Iof

¾Remote compensation adjustment: input corresponding lower limit of analog signal at the Remote end, set Remote

compensation adjustment by parameter in【Regulation Mode】

¾Remote gain adjustment: input corresponding upper limit of analog signal at the Remote end, set Remote compensation

adjustment by parameter in【Regulation Mode】

¾Remote lower limit: Setting Remote lower limit by parameter in【Regulation Mode】

¾Remote higher limit: Setting Remote higher limit by parameter in【Regulation Mode】

Control Mode Setting

There are 4 control modes; ON-OFF, PID, FUZZY and MANUAL.

zON-OFF Mode: For heating output, the output is off when input is greater than the setting value; output is on when input is smaller than (setting value – adjustment sensitivity setting value). For cooling output, the output is on when the input is greater than (setting value + adjustment sensitivity setting value); output is off when input is smaller than the setting value. If one of 2 outputs is set for heating and the other for cooling, a non-action zone can be set as follows.

Heating sensitivity	Cooling sensitivity
adjustment	adjustment
	DeadBand

HeatingCooling

Set value

(Output ON-OFF control of both actions)

¾Set parameter to in 【Initial Setting Mode】

¾Set adjustment sensitivity: Set adjustment sensitivity by parameter【Regulation Mode】 to (Output 1), (output 2)

¾Setting of DeadBand of both outputs: Set DeadBand by parameter in 【Regulation Mode】

zPID Mode: When set for heating or cooling, the program performs PID operation via input temperature and setting temperature, with the operation result output for the temperature control. A PID parameter and control period must be set for this function; these parameters can also be generated automatically via auto-tuning (AT).

a、 A total of six sets of PID parameters are available, one of which can be selected for carrying out PID, and the program may automatically select a set of PID that is most close to the input value. In order to achieve this, each set of PID parameters has a reference input setting value which allows the user to set for manual setting or for auto-tuning (AT). E.G., for the six sets of PID parameters as shown below, SV is reference input setting. Let us select the 4th set as the PID running parameter: i.e., P=40, I=220, D=55, IOF=30%. If we select AT to find the set closest to the setting value with a setting input of 230, the program will automatically find the second set as the running parameter for PID operation.

	0	1	2	3	4	5
SV	80	160	240	320	400	480
P	120	46	70	60	40	50
I	100	140	180	200	220	240
D	25	35	45	50	55	60
IOF	20	10	30	20	30	21

b、 Set PID parameters and the control period: in which PID parameters can be adjusted manually according to system characteristics or created automatically by AT, the pre-set integral value is set as I parameter ≠0, allowing for promptly

achieving the setting value; unit is % output; proportional error compensation is: when I parameter is set to =0, for the adjustment of reduced time to reach the temperature. The Control Period is the period of PID operation, if the control period is 10s, it means a PID operation is carried out every 10s. The result is then output to control the temperature. If the system heats up quickly, the control period shall not be set too long. For relay output, the lifespan of the relay shall be considered; a short period will shorten the lifespan of relay.

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