REC Master 9M - Startup Pieps - CAN Problem
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Hello REC Community, I have a REC Master Slave config with one 9M Master Unit and three slaves. (Large Li-NMC 48S / 20kWh system). https://www.rec-bms.com/rec-bms-master-unit-9m/ Everything works great except the CAN communication to the inverter. You can see in the Webclient that the master finds the three slaves, all voltages are correct and all looks great as it should be. However the CAN bus is dead! I checked cabling, termination, changed CANF to other values. Thanks to many hints :) And, I am familiar with CAN cabling and did this many times before. I even connected a general CAN Monitor. No messages on the CAN connector of the REC Master at all! Wondering if my Master device is broken. The REC Master boots up with one, followed by three pieps. See the short video here: https://drive.google.com/file/d/1J7pfJFbrarOGUYuvrZg9BC7EHALLS3Vz/view While there is documentation on LED blink errors, there is no documentation by REC on the pieps. After finding the Clients on the RS485, the LEDs go out. There is no error blink error. There is no error in the ERRL? command. There is simply no error message anywhere. But the CAN output is dead. Could somebody who did a Master Slave configuration tell me, if the \"piep - 3 x piep\" startup of the master is normal or my device is broken? Thank you so much. Stefan (I am really desperate, as my local REC dealer in Germany is not supportive)
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Richard OGM Support StaffThis is what my demo unit looks like during startup. The bright green LEDs at the end are the contactor enable relays.
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Thanks Rick for making the video. This helps a lot. So it looks like that the sequence after the boot piep is normal and counts the number of found slave devices. You have two slaves, so it boots with piep - 2x piep I have three slaves and it boots with piep - 3x piep. I come more and more to the conclusion that I need to replace my master device. I\'ll try to approach REC directly, as my dealer in Germany seems to be out of business. Thanks again for the great help Rick.
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Hi,
here is the final installation of 40kWh brutto capacity.
All works great with Sungrow and other High Voltage hybrid converters.
Thanks again to Rick and especially to Tine@REC.
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The REC BMS (now) supports the same high voltage CAN protocoll than the high voltage Pylontech systems (Force H1/2) Please note, that this is quite different than the Pylontech 48V CAN protocol.
This is the list of invertes now working with the REC master slave system: (Please request the high voltage CAN firmware on the master, also make sure that you have the latest slave firmware, which fix a bug seen as value fluctuations to zero...)
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Rick OGM Support Staff
This is great information.
Thanks for sharing!
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