NR-HD-5V Datasheet, PDF (7/8 Pages) Nais(Matsushita Electric Works) – LONG LIFE RELAY

NR
AC operation of latching relays
When using circuits such as those at the
right, avoid continued or extended latch-
ing or resetting power input.
Latching
switch
Reset
switch
Latching
switch
Reset
switch
Capacitor discharge operation of latching types
When operating latching types by dis-
charge of a capacitor, more reliable oper-
ation can be expected if the time to reach
pick-up voltage is greater than 2 ms at 5
to 10 µF: (24 V type).
1 coil bistable type
52
6
3
2 coil bistable type
(V)
Specified
Pick - up voltage
NR relay
C
coil
SW
t
more than 2 ms
NR relay contact
5
C
6
2
C
3
Flicker circuit
Automatic coil circuit interruption
Misoperation may occur in self-operated
cutoff circuits such as shown at right. This
can be avoided by adding a resistor and
capacitor and increasing the pick-up volt-
age to above that specified.
In a timer circuit, step-pulse voltage from
PUT (Programmable Unijunction Transis-
tor) or SBS (Silicon Bilateral Switch) is
recommended.
SW
NR relay contact
NR relay coil
Coil voltage wave form
V
T
(Time)
NR relay coil
Residual voltage
When single side stable types or latching
types are driven by transistor or UJT, re-
sidual voltage is sometimes applied to the
coils and decreases contact pressure at
N.O. side even if the transistor or UJT are
in OFF condition. As a result, characteris-
tics of relays may be harmed. Design your
circuits in principle to make such residual
voltage zero.
Short circuit prevention between N.C. and N.O.
The separation of loads or insertion of a
resistor for circuit protection are recom-
mended for the circuits where large cur-
rent flows due to arcing. (See Fig. 1).
Load
N.C.
COM
N.O.
Load separation
Load
N.C.
COM
N.O.
Load
Fig. 1
118