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Cautions for series or parallel connection Loads that cause inrush current
(1) Series connection (AND switching circuit)In case of either 100Vac or 200Vac, the voltage which is applied to the load in the ON condition is VL = VS - (output voltage drop x number of units) (V). Note that the load will not be activated unless VL is more than the minimum activating voltage of the load.When more than 2 units are connected in series and are used in an AND switching circuit, the maximum number of units is 3. (Pay attention to the VS value shown in the figure below.) (2) Parallel connection (OR switching circuit)In principle it is not possible to use more than 2 proximity sensors in parallel as an OR switching circuit. A parallel connection can be used only if A and B do not operate at the same time and if it is not necessary to hold the load. However, consumption current (leakage current) will be multiplied by n (the number of proximity sensors), and recovery failure will occur more easily.If A and B operate at the same time and if it is necessary to retain the load, a parallel connection cannot be used. Under these conditions, when A is turned ON, the voltage at both ends of A and B drops to approx. 10V, allowing load current to flow through A. When a target object approaches B, the switching element of B cannot be activated because the voltage at both ends of B is too low. When A is again turned OFF, the voltage at both ends of A and B increases to the power supply voltage, and at this point B can be turned ON for the first time. During this time, since there is a period (approx. 10ms) when both A and B are OFF, the load is momentarily reset. In order to retain the load, use a relay as shown below. When the proximity sensor is connected to a load such as an electromagnetic switch, lamp or motor that causes inrush current, use the sensor within the rated current, which includes the inrush current. Connection to power supply and load
Be sure to connect the proximity sensor to the power supply via the load. If the sensor is connected directly to the power supply, the sensor will be damaged. Also, output does not have polarity, so the load can be connected to either side of the power supply. However, we recommend connecting the load to the non-grounded side to prevent short-circuiting of the power supply if a ground fault caused by damage to the proximity sensor occurs. LoadLoadLoad LoadLoadAC power supply voltage (Vs) Operation upon power ON
After the power is turned ON, it takes at most 80ms until the proximity sensor is ready for sensing.If the load and the proximity sensor use different power supplies, be sure to turn the proximity sensor ON before turning the load ON. Influence of leakage current
A minimal current flows as leakage current for operating the circuits even when the proximity sensor is OFF. Keep this in mind when turning off connected loads. Minimum cable bend radius (R)
The minimum bend radius (R) of the cable is 3 times the cable diameter. Take care not to bend the cable beyond this radius. Also, do not excessively bend the cable within 30mm of the cable lead-in port.
(1) Series connection (AND switching circuit)In case of either 100Vac or 200Vac, the voltage which is applied to the load in the ON condition is VL = VS - (output voltage drop x number of units) (V). Note that the load will not be activated unless VL is more than the minimum activating voltage of the load.When more than 2 units are connected in series and are used in an AND switching circuit, the maximum number of units is 3. (Pay attention to the VS value shown in the figure below.) (2) Parallel connection (OR switching circuit)In principle it is not possible to use more than 2 proximity sensors in parallel as an OR switching circuit. A parallel connection can be used only if A and B do not operate at the same time and if it is not necessary to hold the load. However, consumption current (leakage current) will be multiplied by n (the number of proximity sensors), and recovery failure will occur more easily.If A and B operate at the same time and if it is necessary to retain the load, a parallel connection cannot be used. Under these conditions, when A is turned ON, the voltage at both ends of A and B drops to approx. 10V, allowing load current to flow through A. When a target object approaches B, the switching element of B cannot be activated because the voltage at both ends of B is too low. When A is again turned OFF, the voltage at both ends of A and B increases to the power supply voltage, and at this point B can be turned ON for the first time. During this time, since there is a period (approx. 10ms) when both A and B are OFF, the load is momentarily reset. In order to retain the load, use a relay as shown below. When the proximity sensor is connected to a load such as an electromagnetic switch, lamp or motor that causes inrush current, use the sensor within the rated current, which includes the inrush current. Connection to power supply and load
Be sure to connect the proximity sensor to the power supply via the load. If the sensor is connected directly to the power supply, the sensor will be damaged. Also, output does not have polarity, so the load can be connected to either side of the power supply. However, we recommend connecting the load to the non-grounded side to prevent short-circuiting of the power supply if a ground fault caused by damage to the proximity sensor occurs. LoadLoadLoad LoadLoadAC power supply voltage (Vs) Operation upon power ON
After the power is turned ON, it takes at most 80ms until the proximity sensor is ready for sensing.If the load and the proximity sensor use different power supplies, be sure to turn the proximity sensor ON before turning the load ON. Influence of leakage current
A minimal current flows as leakage current for operating the circuits even when the proximity sensor is OFF. Keep this in mind when turning off connected loads. Minimum cable bend radius (R)
The minimum bend radius (R) of the cable is 3 times the cable diameter. Take care not to bend the cable beyond this radius. Also, do not excessively bend the cable within 30mm of the cable lead-in port.