Service manual

3 – 4
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
Remote Enabled Output:
• This output is energized when the Vission 20/20
panel is enabled for remote control. If the compres-
sor parameter does not satisfy start conditions or is
placed into the manual stop position, this output is
de-energized.
Shunt Trip:
• This output is designed to be connected to a master
power breaker with a shunt trip input. If the Vission
20/20 detects the compressor motor is running when
it’s not suppose to be, then this output can be ener-
gized to trip the breaker supplying power to a starter.
Comp Motor Starter Auxiliary Contact:
• This input looks for a feedback signal from the com-
pressor starter, confi rming that the compressor
starter is energized.
High Level Shutdown Input:
• This input must be energized in order for the com-
pressor to operate. If de-energized, the compressor
will shut down and issue a high level trip.
Oil Level Float Switch #1 Input:
• This input must be energized in order for the com-
pressor to operate. If de-energized, the compressor
will shut down and issue a oil level #1 trip.
Oil Level Float Switch #2 Input:
• This input must be energized in order for the com-
pressor to operate. If de-energized, the compressor
will shut down and issue a oil level #2 trip.
Remote Select #1/#2 Input:
• This input enables or disables remote I/O control.
Energizing this input enables the Remote Capacity
Increase and Remote Capacity Decrease inputs.
Remote Start/Stop Input:
• If the compressor is enabled for remote I/O control,
this input is enabled. Energizing this input will issue
a start for the compressor as long as it is available to
run. De-energizing this input stops the compressor.
Remote Capacity Increase Input:
NOTE
The scan interval on the remote increase and
decrease inputs is approximately ONE SECOND.
Please take that into account when developing
a control scheme using the remote increase and
remote decrease inputs for compressor control.
• If the compressor is enabled for remote I/O control,
this input is enabled. Operational only when the com-
pressor is running. Energizing this input will increase
the slide valve position.
• The slide valve will continuously increase as long as
this input is energized. The slide valve will not in-
crease when this input is de-energized.
Remote Capacity Decrease Input:
• Operational only when the compressor is running.
This input is enabled if the compressor is enabled
for remote I/O control. Energizing this input will de-
crease the slide valve position. The slide valve will
continuously decrease as long as this input is ener-
gized. The slide valve will not decrease when this in-
put is de-energized.
Condenser / Remote Oil Cooler Step #1 Output:
• This output is enabled when condenser control or
Remote Oil Cooler option is selected. A condenser /
Remote Oil Cooler fan or pump will be turned on or
off by this output.
Condenser / Remote Oil Cooler Step #2 Output:
• This output is enabled when condenser control or
Remote Oil Cooler option is selected. A condenser /
Remote Oil Cooler fan or pump will be turned on or
off by this output.
Condenser / Remote Oil Cooler Step #3 Output:
• This output is enabled when condenser or Remote
Oil Cooler control option is selected. A condenser /
Remote Oil Cooler fan or pump will be turned on or
off by this output.
Condenser / Remote Oil Cooler Step #4 Output:
• This output is enabled when condenser or Remote
Oil Cooler control option is selected. A condenser /
Remote Oil Cooler fan or pump will be turned on or
off by this output.
Auxiliary Inputs #1 - #8:
• Optional inputs that can be confi gured as an alarm
or trip. Typically connected to external switched
devices.
Auxiliary Outputs #1 - #4:
• Optional inputs that can be confi gured as an alarm
or trip. Typically connected to external switched
devices.
Analog Inputs
Refer to Table 3-2. Analog Inputs.
Motor Current:
• Default is a 0-5 Amp current transformer (CT). Current
transformer ratio is set in the calibration screen.
Suction Pressure:
• Default signal is 4-20mA. Suction pressure transducer
Section 3 • Hardware Architecture