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SSR-3JK Series
Voltage Power Regulator

SSR-3JK Series Voltage Power Regulator

Introduction


SSR-3JK Series Three Phase Phase-Shift Trigger Module is a device designed to regulate the load voltage through random solid state relays, and it has built-in synchronous transformer, synchronous phase detection circuit, phase shift circuit (phase control circuit) and trigger circuit. The SSR-3JK series does not have a power output circuit itself, so it needs three random fire solid state relays (which will be switched as soon as there is a control signal). Through generating three wide pulse phase shifting signals (synchronized with the power grid voltage, and has the frequency twice of the power grid frequency), SSR-3JK Series can adjust the conduction angle of the random fire solid state relay from 180° to 0° for linear regulation of three phase load voltage. Our TB-3 three phase synchronous transformer module (co-sold with SSR-3JK Series) provides the synchronous signal and internal operation power supply for the phase-shift module, so users have no needs for any external circuit or power supply. SSR-3JK Series has two control modes, automatic control (E type: CON 0-5V; F type: CON 0-10V; G type: CON 4-20mA; H type: CON 1-5V) and manual control (adjustment of potentiometer).

How to order


How to order SSR-3JK Series Voltage Power Regulator

SSR-3JK (Three Phase Phase-shift Module, For Solid State Relay)
  - [Control Signal] {-E (0-5VDC); -F (0-10VDC); -G (4-20mA); -H (1-5VDC)}

Parameters


SSR-3JK Series img

SSR-3JK Series

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)
Synchronous Signal & Power Source:  TB-3 (three phase synchronous transformer module) provides the synchronous signal and internal operation power supply for the phase-shift module without additional circuit
Load Voltage:  Three phase, 380VAC (300VAC~420VAC), 50HZ
Load Current:  Refer to the rated current of the selected solid state relay
Dimensions & Mounting:  107mm*107mm*30mm; Panel mount solid state module with plastic cover and screw terminals

Features


● Modularization with high pressure resistant, safer and more reliable
● Miniaturization with convenience for installation, wiring and etc.
● Linear phase-shift control circuit with good stability and high precision
● Integrates the synchronous transformer, the phase detection circuit, the phase-shift trigger circuit and the thyristor output circuit.
● No external 18VAC power supply required
● LED status indicator

Dimensions and Circuit Wiring Diagram


SSR-3JK Series, PCB mount, Dimensions

Dimensions

SSR-3JK Series, PCB mount, Circuit Wiring Diagram

Circuit Wiring Diagram

● The entire circuit can be applied to 380VAC (300~420VAC), 50Hz power grid. The three phase input cables (R, S, T) in the main circuit has no phase sequence requirements, but the input cables must be strict one-to-one correspondence with the output terminals of the solid state relay, TB-3, and SSR-3JK (such as T corresponding to SSR1 and CON1), otherwise the system will not work normally.
● CON must be positive relative to COM, and if the polarity is opposite, the output terminal will be out of control (fully open or fully closed).

● The four COM ports of the SSR-3JK are connected together inside the module to form the weak current “earth ground” (fully isolated with the neutral line “N line” of the synchronous transformer), which will be connected to the DC “earth ground” controlled by the external circuit when choose the automatic control mode.
● The power of the three phase load should be balanced.

Application


● Applications that need three phase voltage adjustment.
● For random fire solid state relay.

Precautions and FAQs


● The entire circuit can be applied to 380VAC (300~420VAC), 50Hz power grid. The three phase input cables (R, S, T) in the main circuit has no phase sequence requirements, but the input cables must be strict one-to-one correspondence with the output terminals of the solid state relay, TB-3, and SSR-3JK (such as T corresponding to SSR1 and CON1), otherwise the system will not work normally.
● CON must be positive relative to COM, and if the polarity is opposite, the output terminal will be out of control (fully open or fully closed). When the control terminal CON changes from 0V to 5V, the voltage on the AC load can be adjusted from 0V to the maximum value (for resistive loads). When the control voltage on CON is around 0V~0.8V (Fully-closed Region), the control signal can reliably shut down the output of the module. When the control voltage on CON is around 0.8V~4.6V (Adjustable Region), the conduction angle α decreases linearly from 180° to 0° as the control voltage increases, and the voltage on the AC load increases from 0V to the maximum value. When the control voltage on CON is around 4.6V~5V (Full-open Region), the voltage on the AC load is the maximum value (close to the power grid voltage).
● The input impedance between CON and COM is divided into E, F and H type (the impedance of these three types are greater than or equal to 30KΩ), and G type (the impedance is 250Ω). The +5V voltage signal is only provided for the manual potentiometer (the selected resistance is between 2~10KΩ), not for other uses. Note: The G type (4~20mA as control signal) cannot be manually adjusted by the potentiometer, so the +5V port is useless for the G type.
● The four COM ports of the SSR-3JK are connected together inside the module to form the weak current “earth ground” (fully isolated with the neutral line “N line” of the synchronous transformer), which will be connected to the DC “earth ground” controlled by the external circuit when choose the automatic control mode.
● The power of the three phase load should be balanced. When the load uses the Y-connection method, the center point Y can be connected or not connected to the neutral line. However, the high-order harmonic interference to the power grid when connected to the neutral line is larger than that when not connected to the neutral line. The N line on the synchronous transformer TB-3 must be reliably connected to the earth ground (the neutral line).
● SSR-3JK and TB-3 generate very little heat and do not need to be mounted on a heat sink.
● The speed control of the three phase AC asynchronous motor should be adjusted by the frequency converter, while the three phase voltage regulation module can only be applied to fan motors and pump motors where the requirements are not high. For the soft start of the three phase motors, the voltage/current closed-loop control system should be used.
● Since the SSR-3JK is isolated from the power grid by the synchronous transformer TB-3 on the one hand and isolated from the power grid by three solid state relays on the other hand, the SSR-3JK module is extremely reliable under weak current operation, and will not be damaged even if the three phase load is burned due to short-circuit. For this reason, it is reasonable to choose the three phase voltage regulation system consisting of SSR-3JK (here refers to SSR-3JK system): Firstly, compared with the three phase phase-shift module voltage-regulation system (here refers to SX-JKA system consisting of SX-JKA and six SCR thyristors) produced by our company, the SSR-3JK system is more convenient and reliable to connect, and even if it malfunction, the damage is relatively small (when the SSR-3JK system is short-circuited, only one or two SSRs will be damaged, but for the SX-JKA system, not only the thyristor will be damaged, but also the SX-JKA module will be damaged). Secondly, compared with the three phase voltage regulator module (which integrates the phase-shift trigger circuit and thyristors) produced by our company or other companies, SSR-3JK system is more reliable, because the three phase voltage regulation module contains six SCR thyristors, which will be unstable caused by the poor heat dissipation (due to small volume and large heat), in addition, the damage caused by the load overcurrent is more serious than SSR-3JK system.
● The SSR-3JK (with TB-3) matches the random solid state relays produced by our company. Users can build the SSR-3JK system by purchasing the SSR-3JK, the TB-3, three random conduction type SSRs and one heat sink to. If three long strip solid state relays are selected, they can be mounted on a Y series module air-cooled radiator with a fan installed to form a power unit; and if three rectangular solid state relays are selected, they can be mounted on the MG-Y heat sink to form a power unit.

● What is the Phase Shift Control?
Phase shift control (also known as phase control, phase angle control, or conduction angle control) ,which controls the output voltage by controlling the phase of the trigger circuit. For an output circuit consisting of two anti-parallel (back-to-back) SCRs (each SCR is responsible for a half cycle of power output, and its phase angle can be controlled by the control signal), by changing the phase angle, the SCR will run ahead or delay during its duty cycle. If changing the phase angle of SCRs from 180° to 0°, the AC output voltage (effective value, or rms value) can be smoothly adjusted from zero to maximum.

All Regular Models We Offer


● SSR-3JK Series (Three Phase)

  • SSR-3JKE
  • SSR-3JKF
  • SSR-3JKG
  • SSR-3JKH

(E type: CON 0-5V; F type: CON 0-10V; G type: CON 4-20mA; H type: CON 1-5V)

*Customized models are available, be free to contact us.

Tips


1) When selecting the rated current of the solid state relay/solid state module, please consider the corresponding Derating Fator.
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