Siemens APT Relays - Maintenance Methods for Solid State Relays

Create Date: 2024-8-30 12:03:23|Source: APT/Siemens Shanghai Ergong

1. The influence of the ambient temperature

The load capacity of the solid state relay is greatly affected by the ambient temperature and its own temperature rise, during the use of the device, it should be ensured that it has good heat dissipation conditions, the rated working current of more than 10A products should be equipped with radiators, and the products above 100A should be equipped with radiators and fans when the strong cooling device should pay attention to the good contact between the bottom of the relay and the radiator and consider coating an appropriate amount of thermal grease to achieve the best heat dissipation effect.

If the relay temporarily works at a high temperature of 40°C-80°C), the user can consider derating to ensure normal operation according to the maximum output current and ambient temperature curve data provided by the manufacturer.

2. Over-current and over-voltage protection measures

When the relay is used, the internal output of the solid state relay will be permanently damaged due to overcurrent and load short circuit, so the fast fuse and air switch can be considered in the control loop for maintenance; It is also possible to connect the RC absorption loop and varistor at the output end of the relay to achieve output maintenance. The selection principle is 500V-600V varistor for 220V, and 800V-900V varistor for 380V.

3. Relay input loop signal

When the input voltage is too high or the input current is too large to exceed the rated parameters specified, it can be considered to connect the voltage divider resistor in series at the input terminal or connect the shunt resistor at the input port in parallel, so that the input signal does not exceed its rated parameter value.

4. When used specifically, the control signal and load power supply should be stable, and the fluctuation should not be greater than 10%, otherwise voltage stabilization measures should be taken.

5. When the device is used, it should be kept away from electromagnetic interference and radio frequency interference sources to prevent the relay from malfunctioning out of control.

6. When the solid state relay is open and there is voltage at the load end, there will be a certain leakage current at the output end, which should be paid attention to when using or designing.

7. When the solid-state relay fails to be replaced, the original model or the product with the same technical parameters should be selected as far as possible to match the original application line and ensure the reliable operation of the system.

Siemens APT Relays - Maintenance Methods for Solid State Relays

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