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LT230 Series Digital Indicating Controllers Download PS Sheet

Small general type with 4-digit display of measured value
New overshoot suppression function

Models LT230 digital indicating controllers feature many functions including newly developed PID algorithms and an overshoot suppression function.
  LT230
Features Models Measuring Ranges Specifications
Input Specifications
Input signal
Thermocouple… Standard universal: B, R, S, N, K, E, J, T, U, L
High temperature universal: B, R, S, N, K, WRe5-WRe26, W-WRe26, PtRh40-PtRh20, Platinel II
Resistance thermometer…Pt100, JPt100
DC voltage…0 to 5V
A 250ohm shunt resistor (sold separately) and the 5V (1 to 5V) are used.
Accuracy rating ±0.25% ± 1 digit (at reference operation conditions)
Reference junction compensation accuracy ±1.0°C (23°C±10°C), ±2.0°C (-10°C to 50°C)
Measuring unit °C or °F
Sampling cycle About 0.5 second
Burnout Up scale (thermocouple input, resistance thermometer input)
Measuring current Resistance thermometer … 110µA
Scaling Ranges/scales of DC voltage/current input are optional settings.
(-1999 to 9999)
Scale decimal point 0 to 3
Control Specifications
Control cycle time Approx. 0.5 second
Control system On-off pulse type PID system
Current output type PID system
SSR drive pulse type PID system
Voltage output type PID system
* 2-position control is selectable.
Control setpoint 2 sets switching, 4-digit setting
Setpoint ramp function: Setpoint ramp unit …°C/minute (common to rising/falling)
Setpoint rising ramp: 0 to 9999 (0 = no operation)
Setpoint falling ramp: 0 to 9999 (0 = no operation)
PV start function …At SV change, power-on, Run/Ready
Auto-tuning Standard (Manual setting of PID constants enabled)
PID constants
P…  0.1 (0.0) to 999.9% (0 = 2-position)
I…  0 to 9999 seconds
D…  0 to 9999 seconds
PID deadband (gap) 0.0 to 9.9%
Anti-reset windup High limit … 0.0 to 100.0%, Low limit … -100.0 to 0.0%
Overshoot suppression function On/off selectable
Control operation With direct/reverse action switching
Output specifications
  • On-off pulse type
       Output signal …  On-off pulse conductive signal
       Contact ratings …  Resistive load: 100VAC 3A, 240VAC 3A, 30VDC 3A
          Inductive load: 100VAC 1.5A, 240VAC 1.5A, 30VDC 1.5A
      Pulse cycle …  Approx. 1 second to 180 seconds adjustable

  • Current output type
       Output signal …  4 to 20mADC
       Load resistance …  600ohm or less

  • SSR drive pulse type
       Output signal …  On-off pulse voltage signal
    At ON 12VDC ± 20% (load current … 20mA or less)
    At OFF 0.8VDC or less
       Pulse cycle …  Approx. 1 second to 180 seconds adjustable

  • Voltage output type
       Output signal …  0 to 10VDC
       Output resistance …  Approx. 10ohm
       Load resistance …  50kohm or more
  • General Specifications
    Rated power voltage 100V to 240VAC 50/60Hz universal power supply
    Allowable power voltage 90 to 264VAC
    Working temperature range -10 to 50°C (maximum 40°C at closed installation)
    Working humidity range 20 to 90%RH (no dew condensation)
    Power consumption Maximum about 10VA
    Installation Panel installation
    Weight Maximum 200g
    International Standards
    CE EN61326 + A1 Class A, EN61000-3-2 + A14
    EN61000-3-3,EN61010-1 + A2
    UL UL3111-1
    CSA (C-UL) C22.2 No. 1010
    IP NEMA4X (IP66) (front protection)