System 450™ Series Modular Control Systems with Standard Control Modules Technical Bulletin
9
Hybrid Analog Output
The C450CPW-100 control module is designed for use with variable speed Electronically Commutated (EC) fan
motors on a wide variety of refrigeration and HVAC condensing units.
The C450CPW-100 module has a single onboard analog output that can be configured as a hybrid analog output to
optimize and extend the controlled speed range of variable speed EC motors. The onboard analog output can also
be set up for High Input Signal Selection, which enables precise and efficient EC motor speed control on
multi-circuit condensing units.
Hybrid analog output control enables the C450CPW-100 control module’s hybrid analog output to transition
between a pulse output and a standard VDC output, depending on the sensor value relative to the proportional
band. At low output levels, the pulse output signal provides an average motor speed that is less than the EC
motor’s fixed minimum speed (Figure 4).
Note: Only Analog Output 1 (OUTA1) on the C450CPW-100 control module can be configured as a hybrid
analog output and use the High Input Signal Selection feature. These features are not available for any of
the other outputs in control systems that use a C450CPW-100 control module.
Figure 4: Pulse Signal with Pulse Level = 25% and Logical Output = 12.5%
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