GP250720FHA06V中文资料

CONTACT ELECTRICAL CHARACTERISTICS

Minimum operating cycles Contact rating per pole and load type

Load Curr 100,000 cycles

100,000 cycles

resistive load

inductive load (L/R=5ms)

100 cycles resistive overload

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Fax: (85 Data sheets are for initial product selection and comparison. Contact Leach International prior to choosing a com

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Maximum operating voltage7.3

Maximum latch or reset voltage at +125° C 4.6

Coil resistance in ? ±10% at +25° C40

GENERAL CHARACTERISTICS

Temperature range-65°C to +12 Dielectric strength at sea level

- Contacts to ground, coils to ground1000 Vrms - Between coils, between open contacts500 Vrms / Dielectric strength at altitude 25,000 m, all terminals to ground350 Vrms / Initial insulation resistance at 100 Vdc>1000 M ?Sinusoidal vibration30 G / 75 to Shock100 G / 11 m Maximum contact opening time under vibration and shock10 μs

Operate time at nominal voltage (including bounce) 4 ms max Release time 4 ms max Bounce time 2.5 ms max Contact resistance at rated current

- initial value50 m? max - after life100 m? ma

NUMBERING SYSTEM

GP250 720 E 00 Basic series designation__________________________| | | | 1-Coil Resistance_______________________________________| | | 2-Terminal Types (E,F)______________________________________| | 3-Mounting Style (00,DB,DJ,DE,DQ,DD,DM,HA,BC,BD,BJ,BN)__________| 4-Nominal Voltage (06,12,26)______________________________________

NOTES

1.Isolation spacer pads for PCB mounting available on request.

2.For other mounting styles or terminal types, please contact the factory.

TYPICAL CHARACTERISTICS

*Coil resistance/temperature change: See application note no. 001

Example: Coil resistance at 25°C: 935 ohms. What is it at 125°C?

Correction coefficient on diagram is: 1.39 at 125°C. R becomes: 935x1.39=1299 Ohms Correction also applies to operating voltages

-80-302070120

1.8

1.6

1.41.21

0.80.6

C o r r e c t i o n c o e f f i c i e n t

Temperature ( °C)

Nominal Resistance at 25°C

Nominal Resistance a

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operate contact systems. When voltage is applied to a coil, the resulting current generates a magnetic flux mechanical work. Upon deenergizing the coil, the collapasing magnetic field induces a reverse voltage (als EMF) which tends to maintain current flow in the coil. The induced voltage level mainly depends on the du deenergization. The faster the switch-off, the higher the induced voltage.

All coil suppression networks are based on a reduction of speed of current decay. This reduction may also opening of contacts, adversly effecting contact life and reliability. Therefore, it is very important to have a c of these phenomena when designing a coil suppression circuitry.Typical coil characteristics

On the graph below, the upper record shows the contacts state. (High level NO contacts closed, low level intermediate state contact transfer). The lower record shows the voltage across the coil when the current i another relay contact.

The surge voltage is limited to -300V by the arc generated across contact poles. Discharge duration is abo mircoseconds after which the current change does not generate sufficient voltage. The voltage decreases the contacts start to move, at this time, the voltage increases due to the energy contained in the NO conta voltage decreases again during transfer, and increases once more when the magnetic circuit is closed on Operating times are as follows:Time to start the movement 1.5ms Total motion time 2.3ms Transfer time 1.4ms

Contact State

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C = 0.02xT/R, where T = operating time in milliseconds R = coil resistance in kiloOhms C = capacitance in microFarads

The series resistor must be between 0.5 and 1 times the coil resistance. Special consideration must be ta capacitor inrush current in the case of a low resistance coil.

The record shown opposite is performed on the same relay as above. The operation time becomes:- time to start the movement 2.3ms - transfer time 1.2ms

The major difficulty comes from the capacitor volume. In our example of a relay with a 290 ? coil and time capacitance value of C=0.5 uF is found. This non polarized capacitor, with a voltage of 63V minimum, has 1cm 3. For 150V, this volume becomes 1.5 cm 3

.

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The resistor (parallel with the coil)

For efficient action, the resistor must be of the same order of magnitude as the coil resistance. A resistor 1resistance will limit the surge to 1.5 times the supply voltage. Release time and opening speed are modera major problem is the extra power dissipated.

Semi-conductor devices The diode

It is the most simple method to totally suppress the surge voltage. It has the major disadvantage of the hig contact opening speed. This is due to the total recycling, through the diode, of the energy contained in the following measurement is performed once again on the same relay. Operation times are given by the uppe - time to start the movement 14ms - transfer time 5ms

These times are multiplied by a coefficient from 4 to 8.

The lower curve shows the coil current. The increase prior to NO contact opening indicates that the contac its energy. At the opening time the current becomes constant as a result of practically zero opening speed

Due to this kind of behavior, this type of suppression must be avoided for power relays. For small relays w

low currents of less than 0.2 A, degradation of life is not that significant and the method may be acceptable

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The lower curve on the opposite record demonstrates those characteristics. Voltage limitation occurs at 42

spikes generated by internal movement are at lower levels than zener conduction. As a result, no current i

coil.

The opening time phases are as follows:- time to start the movement 2.6ms - total motion time 2.4ms - transfer time 1.4ms

The release time is slightly increased. The contacts' opening speed remains unchanged.

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