MAN1106-07-EN_XL+_UserManual
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8.7 Analog Inputs
NOTE: See the data sheet for the XL+ OCS model being used for jumper settings and see the
appropriate page in this manual (see
) for details on how to use Cscape to configure the digital
filtering.
The analog inputs on the XL+ OCS allow voltage or current measurement from a variety of
devices. The voltage or current mode is set though jumpers on the unit and settings in Cscape.
Each channel can be separately configured for voltage or current mode.
The analog inputs have a digital filter that can be used to filter electrical noise that may be
unavoidable in some installations. The downside to digital filtering is the inputs will respond
more slowly to sudden changes in the actual input.
8.7.1 Common Cause of Analog Input Tranzorb Failure, Models 2, 3, & 4
If a 4-20mA circuit is initially wired with loop power but without a load, the analog input could
see 24VDC. This is higher than the rating of the tranzorb.
This can be solved by not connecting loop power prior to load connection or by installing a low-
cost PTC in series between the load and the analog input.
Figure 8.7
–
Analog Input Tranzorb - Troubleshooting
8.7.2 Thermistor Option for Special Orders
NOTE: The standard unit does NOT support thermistor.
Thermistor support is a factory option for Models 2, 3, and 4 only. Model 2 can support a two-
channel and four-channel thermistor. Models 3 & 4 support the two-channel thermistor only.
Please refer to the Thermistor Supplement, SUP0797, for thermistor specifications and
implementation details.
