ECM Overview and Setup
UNT-SVX041D-EN 33
VelociTach Motor Control Board
The VelociTach
TM
motor control board controls and
reports the performance of up to two Trane brushless DC
(BLDC) motors.
The motor control board also:
• Coordinates the operation of the fan in response to
electric heat behavior and electric behavior in
response to hydronic heat behavior.
• Incorporates a user interface that allows adjustment of
certain unit parameters and provides constant
feedback on motor operation.
• Integrates service and troubleshooting tools.
• Integrates a versatile configurable auxiliary
temperature sensor.
• Incorporates various safety and lockout features, such
as maintaining proper fan speeds if electric heat is
called for.
Status Display
The motor control board contains a four-digit, seven-
segment display that is used to present information in a
format close to real-world language, while having a small-
form factor. Most characters are immediately
recognizable; however, refer to the tables below for the
graphical representation of each alphanumeric character.
Figure 19. VelociTach motor control board
Figure 20. Status display
Table 20. Screen representation of alphabetical characters
ABCDEFGHI J KLMNOPQRSTUVWXYZ
Table 21. Screen representation of numeric characters
1234567890
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