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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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