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Section 2 • Hardware Architecture
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.3
Figure 2-2. Multi I/O Board Layout
Multi-IO Board Digital I/O
For information about each Digital I/O signal, see Table
2-1. Multi-IO Board (Digital I/O).
Oil Return Solenoid Output
• When state of Low Oil Level Digital Input is found
Active Low, this output is energized. When state of
Low Oil Level Digital Input is changed to Active High
from Active Low state, this output will be de-ener-
gized only once Oil Recovery Solenoid Shutoff Delay
Timer is Lapsed.
Unloader (#1 to #4) Output
• These outputs are active only when the compressor
is running. When the MicroVission determines that
the compressor should increase or decrease capac-
ity, these outputs will get de-energized or energized
respectively in specic sequence as per Compressor
Type set in Conguration screen. See Appendix A,
Unloaders section for more details.
Trip Output
• This output is energized when the system has no
Trips. If a trip is issued, the output de-energizes and
stays de-energized until the trip condition is cleared.
Oil Crank Case Heater Output
• This output is active and energized when the oil
temperature is lower than the oil temperature set-
point. It is de-energized when the oil temperature is
higher than the oil temperature setpoint.
Compressor Start Output
• When the MicroVission signals the compres-
sor to start, this output is energized. When the
MicroVission signals the compressor to stop, this
output is de-energized.
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