B&B Electronics DTB Series user manual Dual Loop Output Control Heating / Cooling Control

Page 6

7

Dual Loop Output Control (Heating / Cooling Control)

Temperature control can be achieved either by heating or cooling. In DTB series, heating and cooling can be operated simultaneously (Dual Loop output control) to perform temperature control. When Dual Loop output control are used, two control outputs must be connected to the heating and cooling devices. Please refer to the following for the operation:

: This parameter is used to select heating or cooling action if operate either heating or

cooling function in this controller. When selecting , 1st output group is heating (reverse)

control, and when selecting , 1st output group is cooling (forward) control. At this

moment, 2nd output group is regarded as an alarm output. If user select or , it indicates that user can operate Dual Loop output control function in this controller. When

selecting , 1st output group is heating (reverse) control and 2nd output group is cooling

(forward) control. When selecting , 1st output group is cooling (forward) control and 2nd output group is heating (reverse) control.

In DTB series, P (Proportional Band), I(Integral Time) and D(Derivative Time) parameters are automatically set by using the Auto-tuning (AT) function.

: This parameter is for the control mode that must be Dual Loop output control with PID control method configured. The value of P, I and D of 1st output group can be set immediately.

The P value of 2nd output group is equal to (P value of 1st output group) x and the value of I and D of 2nd output group are the same as the value of I and D of 1st output group.

: Dead Band, shown as the following figure 1, 2 and 3. This parameter sets an area in which the heating and cooling control output is 0 centering around the set point in a Dual Loop output control mode.

: Settings lock. To avoid incorrect operation, two key lock functions are provided.

: Lock 1 can lock all settings. All parameters and temperature settings can be locked to

disable changes. : Lock 2 can lock settings except the SV (Set point) value. All parameters and temperature settings can be locked with the exception of the SV value. Press

and key simultaneously, the “Lock” status can be released.

 

Dead band

Heating hysteresis

Cooling hysteresis

ON

 

Heating

Cooling

OFF

PV

 

Set point

Figure 1. Output operation of ON/OFF control

during dual loop output control

Output

 

 

 

 

 

 

Dead band: dead

 

 

 

 

 

 

band width=positive

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heating

 

 

 

 

 

 

Cooling

0

 

 

 

 

 

 

 

 

 

 

PV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Set point

Figure 2. PID control, Dead Band is positive

Output

 

 

 

 

 

 

Dead band: dead

 

 

 

 

 

 

 

 

 

 

 

band width=negative

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heating

 

 

 

 

 

 

Cooling

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

PV

 

 

 

 

 

 

 

 

 

 

 

 

Set point

Figure 3. PID control, Dead Band is negative

5

Page 5 Page 7
Image 6
Page 5 Page 7
Contents DTB Series Ordering Information PrecautionDisplay, LED and Pushbuttons DTB SeriesSpecifications Temperature Sensor Type and Temperature RangeOperation When valve feedback Controller. Display when valveSignal feedback function is on Scale = 2.8uA = 1.3mV for tuning output valueDual Loop Output Control Heating / Cooling Control Key simultaneously, the Lock status can be releasedAlarm Outputs Alarm Type Alarm Output OperationPID Program Control Ramp/Soak Program Control Current Transformer CT FunctionEvent Inputs Function PID ControlHysteresis setting value of the 2nd RS-485 Communication20BFH Pattern 0 time is set to 2080H~2087HPanel Cutout and Terminals Identification Terminals IdentificationDTB4848 DTB4896 External DimensionsDTB4824 DTB9696Mounting Error Acknowledge and DisplayCT Wiring Method if CT function is selected Mounting Method

DTB Series specifications

B&B Electronics, a well-regarded player in the field of industrial communication technologies, has made a significant impact with its DTB Series of data transport bridges. Designed for robust data transmission, these devices address the needs of industries that require reliable and efficient communication solutions.

One of the standout features of the DTB Series is its capability to handle multiple communication protocols. This versatility allows users to connect devices operating under different standards without the need for multiple converters, simplifying integration within existing systems. Each model in the series supports various serial communication standards, including RS-232, RS-422, and RS-485, offering the flexibility to cater to a wide range of applications.

The DTB devices leverage advanced technologies to ensure high-speed data transmission. With support for data rates up to 115.2 kbps, they enable rapid communication across significant distances. This is particularly beneficial in settings where timely data exchange is critical, such as in manufacturing floors or utility management systems. Moreover, the devices are engineered to maintain data integrity, employing robust error-checking mechanisms and reliable power supply options.

Characteristically, the DTB Series is built for durability and longevity in demanding environments. The rugged housing of these devices provides protection against dust, moisture, and electromagnetic interference, which are common issues faced in industrial settings. This durability ensures that the DTB devices can perform consistently even in harsh conditions.

Additional features include LED indicators for monitoring power and communication status, which enhances user control and troubleshooting capabilities. With an easy-to-install design, the DTB Series allows for seamless integration into existing systems, reducing the time and effort required for setup.

Furthermore, the DTB Series embodies adaptive technology, supporting automatic configuration and a variety of mounting options, including DIN rail and panel mount installations, providing users with flexibility in deployment.

In conclusion, B&B Electronics' DTB Series stands out as a highly reliable solution for industrial data communication. Its combination of protocol versatility, high-speed performance, rugged construction, and user-friendly design makes it an ideal choice for industries seeking to enhance their communication infrastructure. Whether in factory automation, transportation, or utility management, the DTB Series provides the necessary tools to facilitate seamless and efficient data transport.
Top Page Image Contents