INCH cluster communication settings
- Landis+Gyr – EV Editor 4
- Denis Leskovar
Problem
when MASTER disappears from the LAN and appears back, the other chargers do not automatically find it and do not connect to cluster again; they need to be restarted.
Solution
Short communication interruptions are likely to happen in industrial environments.
That's why we introduced current limits for the cases when communication is lost.
We 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 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. 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 testing, 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 manually turning on cluster service on all chargers.
Please do the following:
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
Enable cluster service on each charger and set Max. cluster currents as desired
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), and save the settings
Reboot all slave chargers and retry the “connection loosing test”.
Max. current output when communication with master fails must be set above the Measured vehicle min current.
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