Differential controller with independent timer

Name: Differential controller with independent timer
SKU: Ascon KR8
Availability: InStock

Process Controller Temperature & PID Controller

Model : Ascon KR8

The KUBE 8 series allows a differential control, a temperature control based on the reading difference of 2 thermocouples.

Other functions on board are:

Dimension: 78 × 35 mm
Control function: PID single or double action, ON/OFF, ON/OFF with Neutral Zone, Autotuning and Self-tuning algorithms, Overshoot control, four programmable Set Points, and motorized actuators.
Alarm function: three alarms programmable as absolute, deviation, band
Serial communication: TTL (standard) + RS485 (optional), ModBus RTU protocol with 1200… 38400 baud rate.
evoGreen: Stand-by mode of display for energy saving
evoTune: the best tunning solution for the current situation and “trouble-free” adjustment.
evoTools: a quick start-up with code-based configuration and instant parameterization by programming key
User calibration: for sensor position, class, and accuracy compensation
Independent timer function: five different operating modes
Signal Retransmission: Measuring or Set-point retransmission
Analog Control Output: current or voltage

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Specifications

Function	Differential controller
Brand	Ascon Tecnologic
Analog Input	Yes
Digital Input	Yes
Number of Outputs	4
Analog Output	1, Yes
Digital Output	Yes
Interface	RS-485, TTL
Protocol	MODBUS RTU Master, MODBUS RTU Slave
Transmission Rate	1200 to 38400 bit/s
Independent Timer	YES
Control	Motorized actuators, ON/OFF and PID single or double action
Special Functions	ON time, Power on delay, Soft start, Transmitter power supply , User calibration
Certification	CE, UL
Display	2 displays with 4 digit 3 dynamic colours
Power Supply	24 Vac/Vdc, 100… 240 Vac
Operating Temperature	0 to +50°C
Protection Degree	IP 65
Dimension	78 x 35 mm
Weight	200g

Other product features

Weight	200 g
Dimensions	78 × 35 mm

Alarm function

KR8 has the capability to generate various types of alarms based on the process requirements.

- Absolute low alarm (LoAb)
- Absolute high alarm (HiAb)

Absolute band alarm with alarm indication out of the band
Absolute band alarm with alarm indication inside the band
Sensor break
Deviation low alarm (relative)
Deviation high alarm (relative)
Relative band alarm with alarm indication out of the band
Relative band alarm with alarm indication inside the band

Control function

The device can be programmed for 2 control types:

- Two control actions (heat & cool) with 2 methods:
- PID (heat and cool);
- Heat/Cool ON/OFF control with neutral zone;

and

- One control action (heat or cool) with 4 methods:
- PID (heat or cool);
- ON/OFF asymmetric hysteresis;
- ON/OFF symmetric hysteresis;
- Servomotor control (available when Output 2 and Output 3 have been ordered as “M”)

KR8 also has the Fuzzy overshoot control feature that reduces the overshoot usually present at instrument start-up or after a set point change, and by setting a value between 0.00 and 1.00, it is possible to slow down the instrument action during the set point approach.

Timer function

Five timer types are available:

Delayed start with a delay time and an “end of cycle” time.
Delayed start at power up with a delay time and an “end of cycle” time.
Feed-through.
Asymmetrical oscillator with a start in OFF.
Asymmetrical oscillator with a start in ON.

Programmer function

These instruments are able to perform a set point profile compounded of 4 groups of 2 steps (8 step total).

The first step is a ramp (used to reach the desired set point), the second is a soak (on the desired set point). When a RUN command is detected, the instrument aligns the operative set point to the measured value and executes the first ramp.

In addition, each soak is equipped with a waiting band which suspends the time count when the measured value goes out of the defined band (guaranteed soak).

Moreover, for each segment, it is possible to define the status of two events. An event can drive output and make an action during one or more specific program steps.

Some additional parameters allow for defining the time scale, the automatic RUN conditions, and the instrument behavior at the end of the program.

All steps can be modified during program execution. During program execution, the instrument stores the segment currently in use and, at a 30 minutes interval, also stores the elapsed time of the soaks. Suppose a power-down occurs during program execution at the next power-up. In that case, the instrument is able to continue the program execution starting from the segment in progress at power down. If the segment was a soak, it is also capable of restarting from the soak time minus the stored elapsed time.

The first step is a ramp (used to reach the desired set point), and the second is a soak (on the desired set point). When a RUN command is detected, the instrument aligns the operative set point to the measured value and executes the first ramp.

Source: Ascon KR8 Official Page