Trane Symbio 500 Installation, Operation And Maintenance Manual page 25

Point Check Diagram
This section shows diagrams and describes methods to check device input/output points before the
connection to the Symbio 500 controller has been made and power has been applied. The step
numbers in each illustration correspond to the information in each table.
Note: The Symbio 500 controller should not be connected to the input and output devices during the
•
•
•
BAS-SVX090B-EN
pre-power checks, so the controller is not shown in the diagrams.
Resistive Inputs
Checkout Procedure
Step 1
Step 2
Step 3
Voltage Inputs
Checkout Procedure
Step 1
Step 2
Current Inputs
Measurement
Measure AC voltage across the
resistive termination.
Measure DC voltage across the
resistive termination.
Measure the resistance across the
resistive termination.
Measurement
Measure AC voltage across the voltage
input.
Measure DC voltage across the voltage
termination.
Wiring
Expected Value
Vac ≈ 0.0 V
AC voltage will affect further
measurement.
Vdc ≈ 0.0 V
DC voltage will affect further
measurement.
Compare the measured resistance with
the expected value based on the
manufacturer's specification and
current conditions.
Expected Value
Vac ≈ 0.0 V
AC voltage will affect further
measurement.
Compare the measured voltage with
the expected value based on the
manufacturer's specification and
current conditions.
25