MAN0974-14-EN_XL7_XL7P_UM
July 6, 2022 Page 85 | 199
8.7 Analog Inputs
NOTE: See the data sheet for the XL7/XL7 PRIME OCS model being used for jumper settings and see the
appropriate page in this manual (see Index) for details on how to use Cscape to configure the digital filtering.
The analog inputs on the XL7/XL7 PRIME 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 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.
8.7.2 Common Cause of Analog Input Tranzorb Failure, Models 2, 3, 4, & 5
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
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