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ECM Overview and Setup
•
The motor control board can accept slightly over-
biased inputs up to 12 Vdc, and the
can be set to a value less than 1.0 to compensate.
VSP Setup Examples
Figure 84. Example 1:
too high
Figure 85. Example 2:
correctly
Figure 86. Example 3:
correctly
94
parameter
set too high and
set
set too high but
set
set correctly and
set
Potentiometer/Rheostat For VSP
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with an appropriate
voltmeter that all capacitors have discharged.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06A-EN
WARNING
Safety Alert!
You MUST follow all recommendations below. Failure
to do so could result in death or serious injury. All
settings take effect immediately, including fan startup,
enabling of electric heat. Caution should be taken to
stay clear of hazardous voltages, moving parts and
electric heat elements while making adjustments to the
motor control board. If it is not practical to stay clear of
these areas during adjustment of the motor control
board, please contact Trane Global Parts for
configuration kit that allows easy powering of the
motor control board outside of the unit with a
9V battery.
A courtesy 10-Vdc supply is provided that can support a
10-mA draw. The use of a 1K or a 10K potentiometer is
recommended, and only a stand-alone potentiometer (not
shared with any other electrical system) should be
employed. When a simple potentiometer is used as
depicted in
Figure
87, the
zone (off).
The typical connection is depicted in
please consult the unit schematic for the most updated
instruction, as
Figure 87
is provided as reference only.
Figure 87.
Typical connection
setting will define a null-
Figure
87; however,
UNT-SVX07E-EN
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Troubleshooting
