High Temperature Ramp Soak PID Controller – PRC-309

High Temperature Ramp Soak PID Controller – PRC-309

Product Description:

PRC-309 – Ramp/Soak Programmable PID Temperature Controller – 1 to 10 profiles – each of 16 steps.

Libratherm offers Microcontroller based multiple Ramp/Soak Programmable PID Temperature Controller Model PRC-309 which is designed to improve reliability, accuracy, and control for all processing applications. It features Ramp and Soak functions (the capability to control the temperature and its rate of change over a predetermined time span). This PID Pressure Controller PRC-309 offers one to ten different patterns each of 16 (ramp/soak) steps, which can be programmed into the memory with the user-friendly membrane keyboard. Separate displays are provided to monitor simultaneously; the Process temperature, Set temperature, and the Program number. They can also be used as single set point control when the profile control is not desired. They accept user-selectable standard temperature sensors like K, R, S, and B type thermocouples.

The Profile Ramp Soak PID Temperature Controller offers both switching outputs in the form of SSR driver or Triac to drive external single or three-phase Solid-state relays or load contactors and linear analog control outputs in the form of (4-20)mA or (0-5)volt or (0-10)VDC, which can be used to control heater power through Thyristor Power Regulators (for an electrical heating system) or to control the position of a modulating motor valve (for oil or gas-fired heating systems). The analog outputs can be directly connected to Libratherm make single-phase/three-phase SCR based phase angle fired power controllers, which are ideally suitable for both resistive and inductive heating load. Additional 4 relays are also provided for time or temperature-dependent event outputs as per the system requirement. The programmed profile and other parameters are retained in the nonvolatile flash memory in the event of power failure.

To monitor the online temperature profile of the heating system, a serial communication port on the RS485 interface can also be optionally provided, the same can be connected to the computer. Libratherm offers Microsoft Window-based Software to view the online behavior of the heating system in both graphical and tabular format on the computer screen.

Key Features:

Accepts thermocouple, RTD(Pt-100), Infrared pyrometer.
Both switching and linear PID control outputs.
Servo start from the process temperature.
User programmable 1-10 different patterns of ramp/soak steps.
Retention and auto-execution of program in case of power failure.
Facility to use as PID and ON / OFF controller.
Interface to computer with window based software.

Application:

Heat Treatment Cycle (Tempering, Hardening, Annealing) control
Investment Casting
Laboratory High Temperature Furnace Control
Laboratory Low Temperature Oven Control
Industrial high temperature furnace control

Parameters	Description
Design	Microcontroller based with 12 bit ADC and dual 12 bit DAC
Input	Thermocouple type K, R, S, B, (user selectable) or RTD (Pt-100)
Range	Subject to the full range of the specified input.
Resolution	1°C Subject to the specified input type and range.
Indicating Accuracy	Better than ± 0.1% of the range ( by software linearization of curves)
Display	4 digit 0.5” for process value. 4 digit 0.3” for set value and other parameters. 2 digit 0.3” for Program number and other codes.
Tuning	Manual tuning of PID values.
Control Algorithm	PID mode for heating control, On/Off mode with programmable hysteresis.
PID values	Proportional Band (P)= 0.0 to 100.0% of Span, Integral value (I)= 0.00 to 5.00 resets/minute, Derivative value (D) = 0.00 to 5.00 minutes Cycle Time (CYC)= 2 to 100 seconds, On/Off Hysteresis (HYSt)= 0 to 50°C,
Soft Start (rt) and Power Limit (PL)	Built in power on soft start (rt) for analog output = 1 to 99 seconds. Power Limit to restrict the analog control output = 1 to 100 %. E.G. If control output is 0 to 5VDC and PL=80%, then control output range will be restricted to 0 to 4Volt (80% of 5Volt). Power Limit to restrict the analog control output = 1 to 100 %.
Control Outputs	a) DC pulses to drive external SSR, b) (4-20)mA, RL max = 300 Ohms. Or c) (0-5)VDC / (0-10)VDC, RL min = 10K ohms. d) (4-20mA) retransmission output proportional to temperature (Optional)
No. of Ramp/Soak Profiles	1 to 10 profiles each of max. 16 steps.
Ramp/Soak Steps	1 to 16 Steps. (No restrictions in programming – a ramp can be followed by a ramp and a soak can be followed by a soak).
Set Temperature	Programmable for each steps in the full range of the specified input. In single set point or profile control mode.
Time per each Ramp/Soak Step	1 to 540 mins. (9 Hrs. per step) Or 1 minute to 100 hours (Two or more steps can be combined for longer time duration).
Run from desired step number (rFSn)	This rFSn facility allows user to skip the ramp/soak steps and run the profile from the desired step number. With servo start facility (to start the step from the current furnace temperature) the rate of heating/cooling can be kept same.
Program Hold Facility	Manual Hold or Auto Hold (Hold back feature for guaranteed Ramp/Soak facility) dHLd= 0 to 50 oC. (Effective from 2nd step) Manual hold when dHLd=0.
Front Panel LEDs	To display the status of control output, Alarms and Ramp/Soak status.
Memory Backup	Retention of PID and set values in the non-volatile memory in the event of power failure and auto resumption of heating cycle.
Alarm Outputs	High or Low or End of Profile Alarm Relays (OUT2 and OUT3) (contacts rated for 5A @ 230VAC).
Serial Communication (Optional Feature)	Optically isolated 2 wire RS485 interface on Modbus RTU protocol (in Slave mode with programmable slave ID)
Supply	90-240VAC ( approx. 5VA), 50/60Hz.
Size	96 x 96 x 120 mm
Panel cut out	92 x 92 mm +/- 0.5 mm
Enclosure	ABS plastic enclosure with ABS bazzel and polycarbonate front.

Code	Input	Range (°C)
A0	User selectable K,R,S,B,	As below
A1	K type : Cr/Al thermocouple	0 to 1372
A2	R type : Pt/PtRh13% thermocouple	0 to 1768
A3	S type : Pt/PtRh10% - thermocouple	0 to 1768
A4	B type : Pt30%Rh/Pt6%Rh thermocouple	200 to 1820
A5	RTD : (Pt-100)/ 2 or 3 wire	0.0 to 400.0

Sr. No.	Specifications	Part No.
1	Input from R, S, B t/c with (SSR + 0-5V or (4-20)mA) control output + High or Low and End of Profile Relay outputs. For High Temperature Furnace control (up to 1700 °C).	1704-1
2	Input from R, S, B t/c with SSR + 0-5V or (4-20)mA) control output + High or Low and End of Profile Relay outputs + RS-485 interface + Supporting windows based PC software. For High Temperature Furnace control (up to 1700 °C).	1704-2
3	Input from K t/c with only SSR control output + High or Low and End of Profile Relay outputs. For Medium Temperature Furnace control (up to 1200 °C).	1704-3
4	Input from K t/c with (SSR + 0-5V or (4-20)mA) control output + High or Low and End of Profile Relay outputs. For Medium Temperature Furnace control (up to 1200 °C).	1704-4
5	Input from K t/c with (SSR + 0-5V or (4-20)mA) control output + High or Low and End of Profile Relay outputs + RS-485 interface + Supporting windows based PC software. For Medium Temperature Furnace control (up to 1200 °C).	1704-5
6	Input from RTD(Pt-100) with (SSR + 0-5V or (4-20)mA) control output + High or Low and End of Profile Relay outputs. For low temperature ovens (up to 400 °C).	1704-6
7	Input from RTD(Pt-100) with (SSR + 0-5V or (4-20)mA) control output + High or Low and End of Profile Relay outputs + RS-485 interface + Supporting windows based PC software. For low temperature ovens (up to 400 °C).	1704-7

Product Category

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