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Recommended Maintenance Procedures
Excela is an electronic switch with a digital display. It has internal diagnostics that continuously check its
electronics to make sure it is operational and alarms if it detects an error.
UEC recommends the following annual checks on the Excela product line to keep the unit in optimal operat-
ing form for the intended function.
1. Check unit for any visible damage, corrosion, leakage or contamination. Clean and repair as
needed.
2. For electrical testing, bypass the PLC connection to avoid false trips. For test, use a 24 VDC
power source and a 1.8K ohm resistor on the COM terminal.
3. Press the up/down arrow button to view the maximum and minimum process parameters that
have been recorded by the unit. To clear values, press the right arrow button and continue to
record new min/max values.
4. Press the right key to display the switch setpoints. Verify that the setpoints are correct.
5. To confirm process display on Excela, connect calibration gauge to the Excela and verify that both
displays match, within tolerance. If minor adjustment is needed, up to +/- 10 % of range, use the
offset and span features within Excela’s advanced programming menu to adjust.
6. If the display shows error messages, check the Installation & Maintenance sheet for potential
causes and corrective actions.
To help with the maintenance, QR codes to the various videos and documents are listed below.
The Excela is a robust and reliable instrument that requires minimum yearly maintenance. If you have any
questions related to this maintenance guide, please contact United Electric Controls at insidesales@ueonline.
com or call inside sales at Tel: +1 617-923-6977 for additional information.
