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Short communication interruptions are quite likely to happen in industrial environments.
That's why we introduced current limits for the case of loosing communicationcases when communication is lost.
We have created a cluster with a master charger and one slave charger. We have set the Max. current output when communication with master fails to 7A. We have started charging on the slave charger. When the slave charger gets target 9A I unplug the ethernet cable from the master charger. After 10 to 15 seconds, the slave charger gets target 7A. When we plug in the ethernet cable to the master charger, after 20 to 30 seconds, the slave charger gets target 9A.
That means that the slave charger has rejoined to the cluster and received a new target. We have repeated the same test but instead, we have unplugged the ethernet cable from the slave charger. Results The results were the same.
During tests, we have been monitoring the target current via the charger's web UI and my PWM device. If the charger changes the target current that means that the cluster is working. If , during testtesting, the vehicle doesn't reduce/increase charging power, despite the changed target current, then it's a problem with the vehicle which doesn't follow the PWM signal set by the charger. Tests like that are repeated many times for every new firmware version.
We suggest to manually turn turning on cluster service on all chargers.
Please do the following:
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Make all the chargers master chargers and set Max. current output when communication with master fails to desired amount (in my example it was 6A), like on the image below
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Enable cluster service on each charger and set Max. cluster currents as desired
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Reboot the chargers.
Change Primary master address for all slave chargers to the IP address of your actual master charger (in my example: 172.25.2.254),
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and save the settings
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Reboot all slave chargers and retry
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the “connection loosing
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test”.
| Info |
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Max. current output when communication with master fails must be set above the Measured vehicle min current. |
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