Relay parameters
1. Mechanical and physical parameter requirements:
Contact force, contact gap, contact follow, recovery reed pressure, armature stroke, stop nail height and so on a mechanical parameters.
2. Electrical parameter requirements:
Ensure that relay in the provisions under the condition of useing, reliable work normally, allowed it to reaction and transmit signal. Including:
winding resistance and contact resistance, Pull in current (voltage), rated current (voltage), release the current (voltage), rated contact load,
insulation resistance, Withstand voltage between contact and contact, Withstand voltage between contact and coil , resistance to electric strength
and electrical parameters.
AC relay Pull in voltage: rated voltage * 85%
Release voltage: rated voltage * 30%
Dc relay Pull in voltage: rated voltage * 80%
Release voltage: rated voltage * 5%
3. Time parameter requirements:
We often mentioned the relay ‘s pull in and release time requirements in the control circuit, and armature conversion, contact bounce,
pulse distortion and time parameter requirements.
4. Life and failure rate index requirements:
Relay in the provision of test environment conditions and contact load(the load often provisions for impedance load) in the provision of operations the number and the load of switching frequency, the number
of errors should be no more than the requirements of the product. Here error, It means, relay in the operation process, off contact of caking
phenomenon, So that when the contact close, The contact presure drop exceeds standard.
This value can be considered a manufacturing plant to relay guarantee value, but it is not 100% insurance life value.
A reliability index requirements of the relay are prescribed beneath efficiency index level requirements.
Failure rate level:
Japanese industrial standard press table points 10 ranks
The provisions of the state level in the list below:
Name |
symbol |
maximum failure rate |
sub-V |
Y |
3*10-5/h |
V |
W |
1*10-5 /h |
VI |
L |
1*10-6 /h |
VII |
Q |
1*10-7 /h |
VIII |
B |
1*10-8 /h |
IX |
J |
1*10-9 /h |
X |
S |
1*10-10 /h |
Acknowledged relay failure provisions for? % / 104 namely every opetation 104 times the percentage of errors, such as 1% 1
04 is 0.0001, which is equivalent to "L" class, Japan's "M". Always remark: λ GO = P, meaning "λ" at 60% confidence under test
failure rate for 0.1% / 104, we call it a P grade level.
OEG communication relay V23079, V23105 etc can achieve P level level, and general power relay, no this index.