PWM controlled DC solid state relay

Application Scope and Usage

• Optical isolation between control signal and output circuit.

• Control signal interfaces with PLC and TTL (suitable for PWM modulation signals).

• LED indicator shows operating status.

• Solid-state contactless output, fast switching speed, no sparks or arcs during on/off.

• Encapsulated with epoxy resin, corrosion-resistant and shockproof, ensuring stable and reliable switch operation.

• The product is mainly used for switching and voltage regulation control of DC power supplies of various sizes, such as motor speed control, electric heater power regulation, large LED light dimming, and battery charging and discharging control.

Product Selection Considerations

• Since the maximum output voltage value in the parameter table equals the forward breakdown voltage, and the maximum load current is the maximum peak current, sufficient margin should be left when selecting. For resistive loads: select current at 2.5 to 4 times the load current, and voltage at 2 to 3 times the load voltage. For inductive loads: select current at 3 to 6 times the load current, and voltage at 2 to 3 times the load voltage.

• According to the relationship between load current and ambient temperature, if the ambient temperature is high or the cooling conditions are poor, the current capacity should be increased.

• To prevent load short circuits that may cause solid-state relay damage, it is required to connect a fast circuit breaker or fast fuse with a current rating slightly smaller than this product in series in the load circuit. Alternatively, you can choose the GZ02/08/09PWM-L (overcurrent) or GZ02/08/09PWM-Z (short circuit) self-protection upgraded products.

• For inductive loads, a freewheeling diode must be connected in parallel at both ends of the load, or a varistor (selected at 1 to 1.5 times the power supply voltage) must be connected in parallel at the output end to prevent damage to the output tube during overvoltage.

• During installation, the contact surface between the heat sink and this product must be flat and smooth, and a layer of thermal grease should be applied to its surface. Finally, tighten and fix the screws with flat washers and spring washers symmetrically to improve heat dissipation performance.

• During normal use, first turn on the control power supply, and then provide the on/off control signal or PID, PWM signal to achieve control requirements. Do not use the method of turning on/off the control power supply to perform switch control by turning on the control signal.