Ecm Overview And Setup; Trane Electronically Commutated Motor; (Ecm); Velocitach™ Motor Control Board - Trane BCHE Installation, Operation And Maintenance Manual

ECM Overview and Setup

Blower coil units integrate a Trane electronically
commutated motor (ECM) with a VelociTach™ motor
control board to deliver outstanding comfort, safety, and
performance while greatly reducing energy consumption
compared to traditional units with induction AC motors.
This system has a high degree of flexibility and
configurability, but with the simplicity of a customized
factory configuration appropriate for most installations.
Very little intervention is needed by service and installation
personnel in most applications; however, installers must
read through the entire document before beginning
installation of the new equipment. With proper installation
and operation, this unit will have a long service life.
This section focuses on unit motors and controls, including
three new circuit modules developed specifically for this
series.
Figure 83. Blower coil with Trane ECM motor
There are four primary components that enable the
technology on your product:
• Trane electronically commutated motor (ECM)
• VelociTach™ motor control board
• Fan speed control (provided when no control package
is selected)
• Customer-supplied terminal interface (CSTI)
The motor and control board are combined as a system,
and cannot work without each other.
86
Trane Electronically
Commutated Motor (ECM)
Figure 84. Trane ECM motor
• The ECM has integrated electronics, overload
protection and short circuit protection. The motor
contains no user-serviceable components inside.
• The motor mates to the unit electrically via a single plug
that contains both the operating voltage and the control
signals that are needed for correct operation.
NOTICE
Equipment Damage!
Failure to follow these instructions could result in
equipment damage.
The motor harness attached to the single plug to
which the motor mates contains the 115V motor
voltage jumper. The motor harness should always be
present for 115V units and should not be modified or
substituted.
VelociTach™ Motor Control
Board
The VelociTach 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.
BCX-SVX002A-EN