MIL-DTL-2212K(SH)
3.17.2 Vibration. Equipment shall be able to withstand the vibration test specified in 4.6.4 without mechanical
damage, contact chatter (see 6.8.5), transfer, or other electrical malfunctioning. Vibration test frequency shall be 4
to 33 Hz. Unless otherwise specified (see 6.2), equipment which will be exposed to frequencies above 33 Hz shall
be vibrated up through 50 Hz. Equipment shall not fail to function in any operational mode, including energized and
de-energized conditions, during the vibration. Pre- and post-test examination and general operation test shall verify
equipment performance.
3.17.2.1 Resilient mounting. Controllers utilizing resilient mounts shall be able to withstand the vibration tests
3.17.2.2 Time delay relays. Time delay relays shall maintain their set time delay (see 6.8.100) and shall
maintain the setpoint repeatability specified in 3.16.4.3 after vibration testing as specified in 4.6.4.1. Post-test
reference measurement of setpoint repeatability and variation of indicated time delay shall conform to the
requirements of 3.16.4.3.
3.17.2.3 Pressure switches. When operated during vibration as specified in 4.6.4.2, pressure switches shall
maintain their setpoint and shall function properly with a setpoint repeatability within three times the stated
repeatabilities specified in note 6 of table II and table III. State transfer shall be positive without contact chatter or
hang-up. Post-test reference measurements shall conform to the requirements of 3.16.6.1, and shall verify retention
of the pre-test established setpoint.
3.17.2.4 Temperature switches. When operated during vibration as specified in 4.6.4.3, temperature switches
shall maintain their setpoint and shall function properly with a setpoint repeatability within three times the stated
repeatabilities of note 4 of table IV. Post-test reference measurements shall conform to the requirements of 3.16.6.2
for setpoint repeatability and differential, and shall verify retention of the pre-test established setpoint.
3.17.3 Shock. Equipment shall be able to withstand the high-impact shock test specified in 4.6.5 without
change of operational state, mechanical or electrical damage, or electrical malfunction. Equipment shall not fail to
function in any operational mode as a result of the shock test. Pre- and post-test examination and general operation
test shall verify equipment performance. Contact performance during impact shall be as follows:
a. AC line contacts. When shock tested as specified in 4.6.5.1.1, closed line contacts of contactors shall not
open for more than 200 milliseconds. Open line contacts shall not close for more than 20 milliseconds.
b. DC line contacts. When shock tested as specified in 4.6.5.1.2, closed line contacts of contactors shall not
open for more than 500 milliseconds. Open line contacts shall not close for more than 75 milliseconds.
c. Associated switching device contacts. Closed contacts may open, or open contacts may close, for a
duration of not more than 10 milliseconds for all pressure and temperature switches as well as for timing relays that
are designed for vital applications. Unless otherwise specified (see 6.2), closed contacts may open, or open contacts
may close, for a duration of not more than 20 milliseconds for the other relays and switches designed for non-vital
applications. The equipment shall not alter state when tested as specified in 4.6.5.1.3.
d. Auxiliary contacts (see 6.8.9). Closed contacts shall not open more than 20 milliseconds. Unless otherwise
specified (see 6.2), open contacts shall not close for more than 20 milliseconds. Test conditions shall be as specified
in 4.6.5.1.3.
e. Assembled controller contacts. Assembled controllers utilizing components and devices qualified to this
specification shall meet the contact performance requirements specified for the applicable line contacts. Other
contacts shall be monitored for qualitative analysis only.
3.17.3.1 Overload relays. Overload relays shall not trip when carrying up to 85 percent of the ultimate tripping
current.
3.17.3.2 Time delay relays. Time delay relays shall maintain their set time delay and shall maintain the
setpoint repeatability specified in 3.16.4.3 after shock testing as specified in 4.6.5.2. Post-test reference
measurements shall conform to the requirements of 3.16.4.3.
3.17.3.3 Pressure switches. Pressure switches shall withstand the tests specified in 4.6.5.3 without damage
other than a shift in setpoint which shall not exceed 3 percent for the 18 blows. Post-test reference measurements
shall conform to the requirements of 3.16.6.1.
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