Controlling External Inductive Circuits - DANIEL 2234 Manual

__________________________ MODEL 2234 DIGITAL FLOW COMPUTER

2.5.5 CONTROLLING EXTERNAL INDUCTIVE CIRCUITS

Externally located inductive circuits may be controlled from the Model 2234 via
contact closure outputs. However, an external arc suppression network must be
used to prevent radiation of high frequency energy into the circuitry, causing false
operation of the computer.
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NOTE:
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The contact closure rating is 30 VDC or VAC, 0.75 amperes, not to exceed 10 W
resistive, 3.5 W inductive.
2.5.5.1 D-C POWERED CONTACT CLOSURE CIRCUITS
Arcing is effectively suppressed in D-C powered circuits by connecting a diode in
parallel with the coil to be energized. Ensure that the diode polarity is such that
when the coil is in the energized condition, the diode is non-conducting.
diode should have a voltage rating equal to or greater than the external D-C supply
voltage. Its current rating should be equal to or greater than the coil energizing
current.
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The unit will compute in error with an unsuppressed inductive
load connected to the contact closure output.
The
SECTION 2