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1260-22 User Manual
Safety
About MTBF
Module Specification 1-4
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Refer to the "FOR YOUR SAFETY" page preceding the Table of
Contents. Follow all NOTES, CAUTIONS, and WARNINGS to
ensure personnel safety and prevent damage to the instrument.
The 1260-22 MTBF is 400,255 hours, calculated in accordance
with MIL-HDBK-217E, with the exception of the electromechanical
relays. Relays are excluded from this calculation because relay life
is strongly dependent upon operating conditions. Factors affecting
relay life expectancy are:
1. Switched voltage
2. Switched current
3. Switched power
4. Maximum switching capacity
5. Maximum rated carrying current
6. Load type (resistive, inductive, capacitive)
7. Switching repetition rate
8. Ambient temperature
The most important factor is the maximum switching capacity,
which is an interrelationship of maximum switching power,
maximum switching voltage and maximum switching current.
When a relay operates at a lower percentage of its maximum
switching capacity, its life expectancy is longer. The maximum
switching capacity specification is based on a resistive load, and
must be further de-rated for inductive and capacitive loads.
For more details about the above life expectancy factors, refer to
the data sheet for the relay.
Manufacturer
Siemens
Aromat
The relay used on the 1260-22 module is part no. 310269. The
relay manufacturer's specifications for this relay are:
Life Expectancy
Mechanical
10
Electrical
10
For additional relay specifications, refer to the relay manufacturer's
data sheet.
Publication No. 980673-055 Rev. A
P/N
T90N1D12-24
JT1A-DC24V
7
operations
5
operations (Full Load resistive)
EADS North America Test and Services
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