Panasonic ASCT1F46E manual Load, Electrical life

4.Load, Electrical life

13.Load voltage

14.Coil voltage

15.Coil

short-pulse input

16.High- frequency of switching

17.Low- frequency of switching

18.Ambient temperature

19.Connection of coil surge absorption circuit

20.Sneak or remaining current

21.Wire length

3 If the load voltage is high, the arc energy which generated at contact switching increases, which may decrease the electrical life. Therefore, it is necessary to give consideration to the voltage which could occur in actual use condition.

If coil applied voltage gets higher, the relay operate time gets faster. However, contact bounce gets also larger so that the electrical life may decrease.

When the short-pulse signal is input to the relay coil, the relay movable part may operate and touch lightly to the contact. Therefore, please avoid short pulse input (100ms or less) since it may cause contact welding due to less contact pressure. Please test adequately, for example when a relay is operated by external manual switch (such as key switch.)

When the switching frequency is high, the electrical life may decrease. Please confirm if there is a high-frequent switching caused by abnormal mode in actual use condition.

Note that if the contact has not been switched for a long time period, organic film tends to be generated on the contact surface, which may cause contact instability.

Verify in the actual use condition since electrical life may be affected by use at high temperatures.

If resistor, diode, zener diode are connected parallel to decrease the surge voltage when the relay coil being turned off, the relay release time will get longer and may decrease the electrical life or cause light-welding.

Load

Please test a relay in actual vehicle condition since there is a risk of deterioration at relay function or switching performance such as slower release time which is caused by sneak current due to diode, zener diode, capacitor mounted on a vehicle or by remaining current soon after a motor is turned off. If long wires (a few ten meters) are to be used in a relay contact circuit, inrush current may become a problem due to the stray capacitance existing between wires. In such case, add a resistor in series with the contacts.