ECM Overview and Setup
UNT-SVX07E-EN
93
Notes:
Note:
Configuration adjustments to the motor control
board should be made through the SMALLER of
the two low-voltage lids on the front of the control
panel, through the low-voltage insulation/
shielding.
•
The 0–10V (variable speed) inputs are available for use,
but are not mandatory. The ECM system comes
standard with three to five field-accessible
thermostatic inputs (with adjustable speed), so the use
of the 0–10V inputs is optional.
•
All inputs are independently configurable and
simultaneously accessible, and the motor control
board will choose the highest user (configured and
requested) speed. However, care should be taken with
customer controls to avoid contention of signals.
The motor control board and adapter boards offer
standard, normalizing 0–10V Variable speed fan inputs for
use with field supplied controllers or thermostats. These
inputs can be used as the only input to the system, used in
addition to the thermostatic (H, M, L) inputs, or not used at
all. The inputs are accessible via 1TB4 on the adapter
boards.
The motor control board is factory configured to drive the
unit to a minimum speed (catalogue “low speed” value),
defined as
and
once the analog (0–10V) input
is honored. As a default, the noise floor/threshold is set to
3 percent (0.3V). At 0.3V, the system will drive the motors
to the speeds defined in defined as
and
. If the
analogue input goes to 10V, the motor control board will
drive the motor to maximum speed (normally catalogue
“high speed” value), defined as
and
, and will
change speed in response.
Although the VelociTach motor control board ships with
settings that will work with most 0–10 Vdc outputs,
calibration should be performed to maximize response
range and controller authority. Typically, the only settings
needed for the VSP inputs are calibration of the signal to
ensure that the system obeys the following rules:
•
The minimum output from the field supplied controller
is met with a positive fan response. That is, we do not
want the
setting on the motor control board to
be higher than the minimum output of the field
supplied controller, as the motor control board will
“ignore” a portion of the usable range of the customer
fan variable speed output.
•
The minimum output from the field supplied controller
is not significantly greater than the floor setting
floor. If the minimum output of the controller is
significantly greater than the floor setting, the first
point that the motor will turn on will be above the
and
value. The full range of motor control
will not be fully utilized in this case, as the motor will
never reach the low speed motor analogue input
scaling value for Motor 1 and Motor 2 (
and
)
•
The maximum output of the controller needs to be 10V,
or if lower, needs to be compensated using the analog
input scaling value,
to normalize the operational
range. As a default, the scaling value is set to 1.00 (so
a voltage of 5V will be graded as 5V); however, to
compensate for long runs or lower max voltages (i.e.,
lower than 10.00), the scaling value can be increased
accordingly to maximize operational range.
For example, if the voltage is only reaching a value of
9.0V at the adapter boards, then the
parameter
should be set to (10/9=)
.
. If left un-calibrated, the
unit will never attain maximum speeds, defined as
and
.
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
and 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.
CAUTION
Burn Hazard!
On electric heat units, certain parameter values are
locked out to prevent overheating of the unit. These
functions will appear to be saved; however, they will
not be accepted if the Electric Heat Protection setting is
“On”. Do not change the Electric Heat Protection setting
to “Off” and make changes to the protected settings
unless you are programming an unconfigured service
replacement board to match the unit settings on a
motor control board configuration label. Failure to
follow this instruction could result in the unit
overheating and becoming hot to the touch, which
could result in minor or moderate injury, and/or
equipment damage.
NOTICE:
Equipment Damage!
You MUST follow all recommendations below. Failure
to do so could result in equipment damage.
•
Care should be taken in the system to use a single
24 Vac supply system to avoid damage to equipment.
•
Care should be taken to observe proper polarity and
grounding in the hookup of the 0–10V system to
avoid damage to equipment.
