Carlyle Compressor Div.
P O Box 4808
Syracuse, NY 13221
Phone: 800-462-2759
Fax: 315-432-3274
11
3.6 Troubleshooting / Application Notes
3.6.1 Electrical Noise
As with any electronic device that contains a microprocessor, operation of the module
can be effected by electrical noise on any of the input wires (power or sensor) or even
the power output wiring. Below are wiring recommendations that should be followed for
all installations. Special attention should be made on installations where a variable
frequency (inverter) drive is used.
The sensor input wires should never run adjacent (in free air or in conduit) to high
voltage wiring. Electromagnetic and capacitive coupling from high voltage wiring to the
sensor wires can corrupt the sensor readings possibly resulting in operational problems.
The module and all module wiring should be kept away from high voltage components
such as power transformers, relays, contactors, etc.
If an inverter is used, precautions should be made to insure that the wires to or from the
module are not closely coupled with inverter power wiring, especially the wiring from the
inverter to the compressor motor. Inverters can emit a significant amount of electrical
noise, which is normal on the output side of the inverter (between inverter and motor).
3.6.2 Pressure Transducer Readings
The cross fitting supplied in the LonCEM package (see Item 8 in Figure 1) for the suction
and discharge access fittings, is supplied with one schraeder fitting (intended for field
gauge measurements). We do not recommend adding a schraeder fitting to any of the
pressure transducer fittings. However, if a schraeder valve is used, precautions should
be made to insure that the schraeder valve is fully engaged. A partially engaged
schraeder valve can lead to false pressure readings.
3.6.2 Service LED Lamp
The service lamp (red LED located in lower right hand corner of module) is used in
conjunction with the LonWorks
®
network (i.e. will light when being installed as a node on
the network). If blinks while the module is installed on a network try re-installing the
module on the network. If it is lit steady during module operation this indicates that the
module software is not functioning properly. This most likely indicates a hardware
problem with the module and it should be replaced.