SELF TUNE PID CONTROLLERS

SELF TUNE PID CONTROLLERS


SALIENT FEATURES
LC - 40	LC - 60
Microcontroller Based
P I D Control Action
Self Tune Algorithm
Two Ramp + Two Soak Profile
Auto / Hand Mode Changeover	Bumpless Auto / Hand Mode Changeover
Programmable Thermocouple Input (J / K / T or R / S type)
RTD, Linear Current / Voltage Input
Digital Output (Relay / solid State Relay Drive)	Analog (Current) & Digital (Relay /Solid State Relay Drive ) o/p
One Auxilliary Alarm Set - Point	Two Auxilliary Alarm Set-Points
Dual Digital Display for Optimum Process Information
Three Level software Key - Lock for Data Entry	Five Level Software Key-Lock for Data Entry
Membrane Key Switch Setting
Non-Volatile Memory : No Batteries Required
Stand - Alone	RS - 485 Serial communication

P I D Controllers Model LC-40 and Lc-60 are extremely versatile and user - friendly process controllers designed for applications where optimal control performance is desired.

The use of high resolution ADC, software linearisation for temperature sensors, automatic cold-junction compensation for thermocouples and lead resistance compensation for RTD sensors ensures a high degree of calibration accuracy.

The dual digital display provides optimum process information at a glance.

Front panel membrane keys are provided for setting input type, range, resolution, calibration offset, control mode, control parameters, alarm mode, auto / manual mode and for selecting self tune and ramp / soak profile utilities.

A multi level security system is incorporated for programming the set values to prevent unauthorised data entries and also to make programming simpler.

The Non-volatile memory ensures safe retention of all the parameters in the event of power failure. This eliminates the need for batteries.

When SELF TUNE utility is selected, the instrument automatically calculates P, I, D terms and removes much of tiresom procedures of manually setting control parameters.

RAMP / SOAK PROFILE utility is useful for attaining the desired process levels at a predefined rate and holding the process at and around these levels for a predetermind time. Both the controllers provide a fixed 4 segment (2 Ramp + 2 Soak) profile generator with "Ramp Hold" and "Soak Hold" facility.

LC-60 optionally allows serial communication with host Computer through RS - 485 communication port.

CALIBRATION TABLE

GROUP	INPUT	RANGE	RESOLUTION	ACCURACY
1.	Iron / Constantan (J) Chromel / Alumel (K) Copper / Constantan (T)	0 - 760 °C 0 - 1369 °C 0 - 400 °C	1 °C 1 °C 1 °C	±1 °C ±1 °C ±1 °C
2.	Pt / Pt - 13 % Rh (R) Pt / Pt - 10 % Rh (S)	0 - 1760 °C 0 - 1760 °C	1 °C 1 °C	±1 °C ±1 °C
3.	Pt100, 3 - wire Pt100, 3 - wire	0 - 600.0 °C 0 - 600 °C	0.1 °C 1 °C	± 0.3 °C ± 1 °C
4.	4 - 20 mA 4 - 20 mA	0 - 999.9 EU 0 - 999.9 EU	0.1 EU 1 EU	± 0.1 EU ± 1 EU
5.	0 - 20 mA 0 - 20 mA	0 - 999.9 EU 0 - 9999 EU	0.1 EU 1 EU	± 0.1 EU ± 1 EU
6.	0 - 1 VDC 0 - 1 VDC	0 - 999.9 EU 0 - 9999 EU	0.1 EU 1 EU	± 0.1 EU ± 1 EU

LC - 40 OUTPUT
OUTPUT	OPT	O/P 1	O/P 2	OPT.	O/P 1	O/P 2
1. Solid State Relay 2. Electromechanical Relay	A B C	ON - OFF ON - OFF P I D	ON - OFF ALARM ON - OFF	D E	P I D ALARM 1	ALARM ALARM 2

LC - 40 OUTPUT
OUTPUT	TYPE	CONTROL ACTIONS	OPT.	ANALOG O/P 1	DIGITAL O/P 1	DIGITAL O/P 2
1. Analog 2. Digital	0/4 - 20 mA 0 - 1 VDC Relay S.S.R. drive (12 VDC)	P I D (Heat / Cool) Retreansmission P I D (Heat / Cool) ON - OFF (Heat/Cool) Alarm Annuciation	A B C D E	P I D P I D RET * RET * RET *	ALARM 1 ON - OFF P I D ON - OFF ALARM 1	ALARM 2 ALARM 2 ALARM 2 ALARM 2 ALARM 2
			* RET = RETRANSMISSION

SPECIFICATIONS	LC - 40	LC - 60
Input / Range / Resolution / Output / Control Action	Refer above Tables
Null & Span	Presettable within the range
Proportional Band ( P) Integral Factor ( I ) Derivative Factor ( D)	1 - 9999 or 0.1 - 999.9 °C or EU 0 - 1000 Seconds ( 0 = Cut - off) 0 - 1000 Seconds ( 0 = Cut - off)
Cycle Time	1 to 99 Seconds, presettable
Min. / Max. Output Power	Presettable
Calibration Offset	- 99 to 99 or - 99.9 to 99.9, presettable
Hysteresis	1 to 250 or 0.1 to 25.0, presettable (ON - OFF action)
Control Logic	a. Heat b. Cool c. High Alarm d. Low Alarm	a. Heat b. Cool c. High Alarm d. Low Alarm e. Deviation Alarm
Outputs	Analog : None Digital : Two	Analog : One Digital : Two
Serial Communication	Not Provided	RS - 485 (Optional)
Display	2 X 4 - Digit, 0.5" ht., Seven Segment red LED
Mode of Setting	By Membrane key - switch on the front panel
Op. Ambient Temperature	0 - 50 °C
Supply Voltage	230 VAC +/- 10% 50 Hz
Dimensions (in mm)	96(H) X 96(W) X 150 (D)	96(H) X 96(W) X 275 (D)
Mounting (in mm)	92 X 92

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