ECM Overview and Setup
UNT-SVX041D-EN
41
•
The motor control board can accept slightly over-
biased inputs up to 12 VDC, and the
parameter
can be set to a value less than 1.0 to compensate.
VSP Setup Examples
Potentiometer/Rheostat For VSP
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
, the
setting will define a null-
zone (off).
The typical connection is depicted in
; however,
please consult the unit schematic for the most updated
instruction, as this is provided as reference only.
Figure 28.
Example 1:
set too high and
set
too high
Figure 29.
Example 2:
set too high but
set
correctly
Figure 30.
Example 3:
set correctly and
set
correctly
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. For variable frequency drives or
other energy storing components provided by Trane or
others, refer to the appropriate manufacturer’s literature
for allowable waiting periods for discharge of
capacitors. Verify with a CAT III or IV voltmeter rated per
NFPA 70E that all capacitors have discharged.
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.
