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ECM Overview and Setup
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 ECM engine will
choose the highest user (configured and requested)
speed. However, care should be taken with customer
controls to avoid contention of signals.
The ECM engine 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 ECM engine 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
analogue input goes to 10V, the ECM engine will drive the
motor to maximum speed (normally catalogue "high
speed" value), defined as
change speed in response.
Although the ECM engine 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:
1. 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 ECM engine board to be
higher than the minimum output of the field supplied
controller, as the ECM engine will "ignore" a portion of
the usable range of the customer fan variable speed
output.
2. 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 (
)
3. The maximum output of the controller needs to be 10V,
or if lower, needs to be compensated using the analog
input scaling value,
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
should be set to (10/9=)
54
and
. If the
and
, and will
and
to normalize the operational
parameter
.
. If left un-calibrated, the
unit will never attain maximum speeds, defined as
and
.
4. The ECM engine can accept slightly over-biased inputs
up to 12 Vdc, and the
value less than 1.0 to compensate.
VSP Setup Examples
Example 1:
set too high and
Example 2:
set too high but
Example 3:
set correctly and
parameter can be set to a
set too high
set correctly
set correctly
UV-SVN02C-EN
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Troubleshooting
