This document explains the problem and solution in case a system must be start-up automatically when an AC power is applied to the chargers.
¶ Problem
The MG Master LV has the ability to start-up automatically when a voltage rise is detected on the Chargers/Loads side. In some systems there will not be a DC voltage on the output of a chargers when it is connected to the AC power. This will cause the MG Master not to start-up and will not send an allow-to-charge signal to the charger to put DC voltage on the ouput.
¶ Solution
The solution in such a case is to apply a voltage from a second source. This means a small AC/DC converter is used to apply a voltage rise to the Chargers/Loads side of the MG Master LV such that it will start-up automatically and enable charging of the main chargers.
¶ Schematic
The schematic below shows the solution.
Make sure the setting
Automatic start-up when charger is detectedis enabled in the MG Master LV settings.
¶ Parts
The following part is tested and works in smaller systems with a single inverter charger.
- For 48 V systems: APC-16-350
LED Driver, 16.8 W, 48 VDC, 350 mA, Constant Current - For 24 V systems: APC-16-700
LED Driver, 16.8 W, 24 VDC, 700 mA, Constant Current
The size of the AC/DC converter is depending on the charger/inverter DC capacity. A higher capacity on the DC-bus will require a higher current from the AC/DC converter.