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Product name:SCR-JKK^2

Product overview:

Control Signal:  E: CON 0-5V; F: CON 0-10V; G: CON 4-20mA; H: CON 1-5V
*(E, F, H types can be controlled by the manual control circuit, G type cannot be adjusted with the potentiometer)
Power Source:  Internal synchronous transformer can provide working power and synchronous voltage (18VAC) for SCR-JKK/TRIAC-JKK without additional circuit or external power
Load Voltage:  Single phase, 220VAC
Load Current:  Refer to the rated current of the selected solid state relay
Dimensions & Mounting:  56mm*56mm*16mm; Panel mount solid state module with plastic cover and plug-in terminals

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Product introduction


Product Image - SCR JKK/2


● The principle of the single phase dual channel thyristor phase-shift trigger module (SCR-JKK/2) is: On the basis of SCR-JKK, add one thyristor trigger signal of the negative half period to achieve the simultaneous phase-shift adjustment of the positive and negative half periods of two single phase thyristors in the single phase circuit. Except for it, the parameters and performance of SCR-JKK/2 are the same as SCR-JKK.
● According to different control signals, SCR-JKK/2 can be divided into four types: E, F, G, and H types. The following is the specification model table.

E Type: CON 0-5VF Type: CON 0-10VG Type: CON 4-20mAH Type: CON 1-5V

Application circuit

Wiring diagram - the SCR JKK/2 with two sets of SCR and rectifier diodes method 1

Wiring diagram - the SCR JKK/2 with two sets of SCR and rectifier diodes method 2

Wiring diagram - the SCR JKK/2 with two sets of SCR and RC circuit

(Note: see Figure D-C-1 and Figure D- C-2 for the improved circuit diagram of Figure C-1 and Figure C-2)

Wiring diagram - the SCR JKK/2 with two sets of SCR and 3 rectifier diodes, RC circuit

Wiring diagram - the SCR JKK/2 with two sets of SCR and 2 rectifier diodes, RC circuit

The relationship and waveform of the control voltage UCON and the conduction angle α of the thyristor (when resistive load)

Waveform meaning and relationship of the SCR JKK/2

Precautions and improvements
● SPECIAL ATTENTION: TRIAC-JKK, SCR-JKK and SCR-JKK/2 these three types modules adopt strong electric trigger mode, so when the module cannot be triggered to conduction due to the damage of the thyristor gate, if there still remains voltage on the trigger module, the current of the power grid will enter from the A port and then pass through the G port to the load, and the vast majority of the power grid voltage will be applied to both ends of A and G, after that there will be huge heat generated caused by the high voltage and current, which will burn and damage internal components connected to the both ends of A and G in few seconds. It is the main deficiency of these three kinds of module s that the trigger module will be damaged caused by the damage of the gate of the thyristor.
● IMPROVEMENT DESCRIPTIONS: For these phase-shift trigger module series, in order to improve the static dv/dt of the voltage regulation system (consisting of the phase-shift trigger module, the thyristor and the synchronous transformer) and also prevent the voltage regulation system from the transient conduction once when the system is switched and powered on, the improvements of Figure B-1/B-2 and Figure C-1/C-2 as follows: The A port of the phase-shift trigger module should be connected to the midpoint of the corresponding RC snubber loop, and the connection method of R and C must be as shown in the figure (that is, one end of R should be connected to the anode of the single-phase thyristor or the main electrode T1 of the TRIAC, and one end of the C should be connected to the cathode of the single phase thyristor or the main electrode T2 of the TRIAC), and the positions of R and C cannot be exchanged. The resistance of the RC circuit is generally 15~30Ω, 3W or more, and the capacitance is 0.1~0.47μf, 250VAC/400VAC or more.

The overall dimensions of the thyristor phase-shift trigger module

Dimensions - SCR JKK/2