NR

117

The following is life data under our HP2 relay load.

(Notes)

1. When inrush current occurs in the capacitor load circuit or incandescent lamp load circuit, reduce it to less than 5 A. Electrical life of "AuCo" contact

types is 10,000 operations in a 5 A inrush current circuit.

2. When 5 A to 10 A inrush current occurs in the capacitor load circuit or incandescent lamp load circuit, the use of power types is recommended.

Contact voltage

Contact current

Contact protection circuit

Operating speed

Expected life, min. op.

6 V DC

232 mA

0.2

µF + 1kΩ or diode

2 op./s

3

12 V DC

106 mA

0.2

µF + 1kΩ or diode

2 op./s

3

24 V DC

54 mA

0.1

µF + 1kΩ or diode

2 op./s

3

100 V DC

15 mA

0.1

µF + 1kΩ or diode

2 op./s

2

24 V DC

80 mA

0.2

µF + 1kΩ

2 op./s

3

100 V DC

20 mA

0.1

µF + 1kΩ or varistor

2 op./s

2

200 V DC

10 mA

0.1

µF + 1kΩ

2 op./s

2

2 coil latching types

A) The circuit at right is recommended

when using one coil for latching and the

other coil for reset.

NR relays are sensitive enough to be op-

erated by the discharge of energy accu-

mulated in the inner-coil capacitance. The

use of a diode of over 200 V breakdown

will prevent misoperation from this source.

In order to maintain the insulation be-

tween the two coils, connection of the ter-

minal No. 3 and No. 6 or the terminal No.

2 and No. 5 is recommended, as shown in

the right figure.

Rectifiers should be inserted in this circuit

when the nominal coil voltage of the NR

relay is more than 24 V DC.

B) No damage will occur to the coil of ei-

ther the one or two coil latching types

even if the operating voltage is as much

as 2 or 3 times the nominal coil voltage.

C) If separate pulses are applied to each

coil of the 2 coil latching types, the first

pulse will operate when the pulses are of

equal voltage. When voltages differ the

higher voltage will cause operation pro-

vided the voltage difference is greater

than the measured pick-up voltage. Volt-

age difference on the coils will reduce

contact pressure proportionately.

Continuous bias voltage after an operat-

ing pulse lowers contact pressure and vi-

bration resistance.

bias voltage

coil

coil

Ripple factor

Coils should be operated on pure DC.

Rectified AC may cause changes in the

pick-up/drop-out characteristics because

of the ripple factor. Use of a capacitor in

the circuit is recommended to keep the

ripple factor below 5%.

: relay

E min. E max. E mean

DC component

Pulsating component

capacitor (ripple filter)

R

R

To calculate the ripple factor

Ripple factor (%) =

× 100%

E max. = max. value of pulsating component

E min. = min. value of pulsating component

E mean - average value DC component

E max. – E min.

E mean

When designing NR relay circuits

Care should be taken when designing re-

lay circuits since the response of the relay

is so fast that bouncing or chattering from

conventional relays in the circuit may

cause false operation.

When using long lead wires

When long wires (as long as 100 m or

more) are to be used, the use of resis-

tance (10 to 50

Ω) in series with the con-

tact is required in order to eliminate the

effect of the possible inrush current due to

the stray capacitance existing between

the two wires or between the wire and

ground.

Contact of NR relay

Lead wire

+

Energy accumulated in

static capacitance

(100 to 300 m)

10 to 50

Ω

(Equivalent circuit)