top of page

​Smart SPR/TPR

Digital Display &

Various Functions

RS 485 MODBUS Interface



  • Digital Display and Setting
    Input signal (%), R and T phase current (A) etc. display and setting

  • Input Failure Alarm (3 phase only)
    Make alarm when input line broken or unbalance over 30% of 3 phase line

  • Over Current Limit and Alarm
    Make alarm and forced output down when processing current is over set value

  • Alarm Relay on Board

  • Load Failure Alarm
    Make alarm when not connected load or current average under 2.5A even after the set time has elapsed

  • SCR Over Temperature
    Make alarm when SCR temperature is over 85℃

  • RS485 MODBUS Interface (Option)


  • Voltage: One of AC 220V, 380V, 440V (AC 100V, 110V, 120V, 200V, 240V, 400V are made by order) . ±10%

  • Cycle: 50/60Hz

  • Current capacity: 35A, 50A, 80A, 100A, 120A, 150A, 190A, 240A, 500A.
    (in case of ambient temperature is 50℃ or less)

  • Control Mode: Phase angle

  • Input Signal: DC4~20mA (Input impedance 250Ω), ON-OFF dry contact, Non-signal (1kΩ VR), Interface (RS485 MODBUS Protocol)

  • Output: Maximum 97% of input voltage

  • Load: All resistance loads. Primary of transformer

  • Interface Protocol: RS 485. MODBUS®

  • Operating Temperature: 0~50℃

  • Cooling: Under 100A: Natural Cooling
            Above 120A: Fan

  • Alarms: Over Current, Partial Line Failure, Load Unbalance, Unload, Thyristor Overheating.

  • Alarm Output: AC 250V 1A (R Load)

  • Insulation Test: Between Power Terminal and Case AC 500V 50MΩ or more

  • Puncher Test: Between power terminal and case AC 2000V. 1 min.




4~20mA Current Input Signal


      This is frequently used operation for control. Control signal is 4~20mA dc current.

      Maximum output voltage is limited by external V.R or OUt parameter value.  


   Note 1) In case of connect external V.R, keep the terminals number.

   Note 2) If connect external V.R, at G1, G2, and G3 terminal, disable internal parameter OUt automatically. 



1 Over Current Alarm and Relay Operating


    Alarm operating when the measured R, T phase current average current the set upper limit parameter symbol: CLm). Over current limit Execute the following three alarm / control operations according to the operation mode (parameter symbol: Cmd).


       1) Alarm Only: Current Limit LED and relay turn on.


       2) Output Off: Power output will be off. Current limit LED will be blink.

For restart, press [RST] Key after trouble shooting.          

3) Control: The output current is forcibly reduced to the current upper limit value or lower. Output voltage drop may occur.


2  Partial Line Failure


   Alarm operating when at least one of the input power (R, S, T) is broken.
    The following two alarm / control operations are performed according to the line failure alarm operation mode (parameter symbol: Pmd).


       1) Alarm Only : Power error LED and relay turn on.


       2) Output Off    : Power output will be off.  Power error LED will be blink. For restart, press [RST] Key after trouble shooting.


3  Load-unbalance


     R and T phase current difference of more than 30%.  (operating only 5A over)


4  Load Break, Un-Load


 If the input or output limit setting is not 0 and the time given by the LBA variable has elapsed R phase, and T phase output current average is 2.5A or less.  

Check below point.


      (1)  Unload

      (2)  Connection

      (3)  Broken Fuse

      (4)  Broken SCR Element



5  Over Temperature of SCR


 It occurs when the temperature of the control element (SCR) exceeds 80℃.
According to the overheat alarm operation mode (parameter symbol: tmd), the following two alarm / Conduct.


       1) Alarm Only: Over Temp. LED and alarm turn on.


       2) Output Off: Power output will be off.  Over temp. LED will be blink. For restart, press [RST] Key after trouble shooting.

How To Order

bottom of page