(APPENDIX VII) CALIBRATION OF THE CONTROL UNIT | PAGE 106
14. APPENDIX VII: COMMUNICATIONS FAILURE
The user interface of the CEA7 control unit displays the text COMMUNICATIONS
FAILURE when it cannot establish communication with the PHG7 control module.
This condition may be caused by:
• The terminals of the installation's CAN communications bus are
not enabled: Turn off the control unit, check that there is 60 Ω of
impedance between the installation's CANH and CANL lines.
• Faulty wiring of the communications bus: Turn off the control unit,
check the continuity between the CANH terminals of the user interface
and the PHG7 control module. Then, check the continuity between the
CANL terminals of the user interface and the PHG7 control module.
• PHG7 module power failure: Turn on the control unit, check that the
voltage between the BAT+ and the BAT- terminals of the PHG7 power
module is greater than 8 V.
• PHG7 module activation failure: Turn on the control unit, check that
the voltage between the MAN and the BAT- terminals of the PHG7
power module is greater than 8 V.
APPENDIX VI: EXPANDING INPUTS
The CEA7 control unit allows you to add digital inputs, analogue inputs (0-10 V,
4-20 mA and resistant) and PT100 by connecting input expansion module devices
(CCIn8 and CCPT100) to the control unit's communications bus. Up to 4 input
expansion modules can be connected (CCIn8 and CCPT100), as follows:
• Digital inputs: The unit can handle the digital inputs of up to 4 digital
input expansion modules (up to 32 digital inputs).
• Temperature input via PT100 probe: The unit can handle the
temperature inputs of up to 2 CCPT100 modules (8 temperature
inputs via PT100 probes).
• Analogue inputs (0-10V, 4-20mA and resistant): The unit can handle
1 CCPT100 module (5 analogue inputs).
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