Delta Electronics DTB4896 Especificaciones descargar pdf (Pagina 5)

The Number of Steps: The number of steps in each pattern (range: 0 ~ 7). For example, if the parameter is set as 2, it refers to pattern 7 will

execute step 0 ~ step 2 and other steps will not be executed.

The Execution:

1. When the parameter

is set as , the program will start its execution from step 0 of the start pattern.

2. When the parameter

is set as , the program will stop and the control output will be disabled.

3. When the parameter

is set as , the program will stop and the temperature will stop at the SV before the program stops. When you select

again, the program will execute again from step 0 of the start pattern.

4. When the parameter

is set as , the program will stop and the temperature will stop at the SV before the program stops. When you select

again, the program will resume the step before the program stops and execute by the remaining time.

Display:

In PID programmable control, some SVs are re-set as P-XX. P refers to the current pattern and XX refers to the current step. Press

to modify the

display.

Select

and press . SV will display the target temperature for the current step.

Select

and press . SV will display the remaining time of the current step.

 PID Control

In PID control, you can select any one of the 4 groups of PID parameter (P, I, D, IOF). After auto-tuning, the PID value and the temperature SV will be stored

into the selected PID parameter.

~ : PIDn, n = 0 ~ 4. 0 ~ 3 are the corresponding selected PID parameter. refers to auto-selected PID and the program will

automatically select a most useful PID parameter based on the current SV. SV displays will be

~ corresponding to n = 0 ~ 3.

~ : The SV for the selected PID parameter, can be set by the user or auto-generated by auto-tuning.

 Valve Control

Heaters and coolers can be used to control the temperature and the openness of the valve in order to control the flow of the medium. Current and voltage

can control the openness of the valve; however, the most direct and economic way to control the openness of the valve is the relay. To control the valve by

voltage and current, you can use the DTB series analog output controller. If you tend to use relay for the control output, you have to choose the valve

function in DTV series. The two control outputs are relay output for the forward/reverse running of the motor to drive the opening and closing of the valve.

Control output1 controls the opening of the valve and control output 2 controls the closing of the valve in order to adjust the position of the valve. In order to

detect the position of the valve, DTV is able to receive “feedback signal” and “no feedback signal”. When there is no feedback signal and the valve is fully

open, control output 1 will output continuously. If at the moment the valve is fully closed, control output 2 will output continuously. If the valve you use is with

feedback output, you can connect the output of the valve to the feedback part of DTV and set

to On to precisely control the openness of the valve. If

there is no feedback signal or the feedback signal is incorrect, and the pre-set openness of the valve is not reached after twice as long as the time set in the

parameter

, the program will automatically switch back to the no feedback state. To ensure the correctness of the valve control, please make sure

that you have set up the parameters below:

: Time required from the valve fully closed to fully open. This parameter has to be correct when the valve is without feedback signal; otherwise, the

accuracy for the temperature control will be affected. The PID control will correspond to the openness of the valve according to the setting of this parameter.

: DeadBand value of the valve. The parameter is to prevent frequent movement of the valve. For example, assume the DeadBand is 4%, PID control

will correspond to the openness of the valve within 4% and the valve will not move within the range unless the value is accumulated and exceeds 4%. If the

Deadband value is too small and the valve is set to have feedback signals, moving back and forth of the valve will shorten the life of the valve motor.

: With or without feedback signals.

When

is set as “On”, it refers to “with feedback signals” and the following parameters will be displayed.

a) : Automatically adjusting the upper/lower limit of the valve feedback. This parameter will only be displayed when is set as . When

this parameter is set as On, the relay will enable the forward and reverse running of the motor in order to calculate the time needed from the valve fully

closed to fully open and the feedback signal of fully closed and open. The feedback signal is the hardware D/A value of the valve control, which is for the

calculation of the valve controller.

b) : Upper limit of the valve signal. Set as “On”, can be set automatically or manually.

: Lower limit of the valve signal. Set as ”On”, can be set automatically or manually.

 Auto/Manual Mode Switch

A/M indicator On refers to manual mode; A/M indicator Off refers to auto mode. Besides On/Off, PID, programmable and manual controls, the valve control

is also able to forcibly switch to manual control (fixing the openness of the valve, unit: % from valve fully closed to fully open) when in PID control mode. You

simply need to press

in PID control mode to switch to manual mode and A/M indicator will be On. Press again to return to PID control and A/M

indicator will be Off.

 Upper/Lower Limits of Valve Openness

Assume we would like the maximum openness of the valve to be 80% and the minimum to be 20%, set the parameter as 80 and as 20,

and the valve openness of PID control, programmable control and manual control will fall within this range.

 RS-485 Communication

1. Supports transmission speed 2,400bps, 4,800bps, 9,600bps, 19,200bps and 38,400bps; does not support communication format 7, N, 1/8, E, 2/8, O, 2.

Communication protocol: Modbus (ASCII or RTU). Function: 03H (able to read max. 8 words in the register), 06H (able to write 1 word into the register),

01H (able to read max. 16 bits of data), 05H (able to write 1 bit into the register).

2. Address and content of the data register.

Address Content Explanation

1000H Present temperature value (PV)

Unit: 0.1 degree, updated every 0.4 second.

The read values below indicate the occurrence of errors:

8002H: temperature not acquired yet

8003H: temperature sensor not connected

8004H: wrong sensor type

8006H: unable to acquire temperature, ADC input error

8007H: unable to read/write the memory

1001H Set point (SV) Unit: 0.1 degree