Only calibrated meters are approved for electricity accounting according to §25 of the German calibration law. Non-compliance is an administrative offense according to §19. M-Bus converter three-phase meter with adjustable converter ratio and MID. Maximum current 3x5A, standby loss of only 0.5 watts per path. Series installation device for mounting on DIN-EN 60715 TH35 mounting rail. 4 division units = 70mm wide, 58mm deep. Accuracy class B (1%). With M-Bus interface. This three-phase meter measures the active energy based on the currents flowing through the converters. The own consumption of only a maximum of 0.5 watt active power per path is not measured and not displayed. 1, 2 or 3 converters with secondary currents up to 5A can be connected. The starting current is 10mA. The N connector must be present. The 7-segment LC-display can be read twice within two weeks even without power supply. The power supply is indicated by a 10-times flashing LED per kWh. To the right of the display are the MODE and SELECT buttons, which are used to scroll through the menu according to the operating instructions. First, the backlight turns on. The total active energy, the active energy of the resettable memory as well as the instantaneous values of power, voltage and current per phase conductor can then be displayed. In addition, the converter ratio can be adjusted. It is factory-set to 5:5 and locked with a bridge over the connection terminals marked WITH JUMPERS. The converter ratio is adjusted to the installed converter by removing the bridge and adjusting it in accordance with the operating instructions. Then it is locked again with the bridge. The conversion ratios 5:5, 50:5, 100:5, 150:5, 200:5 can be set. 250:5, 300:5, 400:5, 500:5, 600:5, 750:5, 1000:5, 1250:5 and 1500:5. Error message (false): If the external conductor is missing or the current direction is incorrect, false and the corresponding external conductor is shown on the display. Data transmission M-Bus: When reading out, all values are transferred in a message frame. The following message frames are supported: Initialization: SND_NKE, response: ACK, read out counter: REQ_UD2, response: RSP_UD, change primary address: SND_UD, Answer: ACK, Reset RS1: SND_UD, Answer: ACK, Slave selection for the secondary address, Answer: ACK, the device does not respond to unknown queries. The transmission rate is detected automatically. The device has voltage monitoring. In the event of a voltage loss, all registers are stored in the EEPROM. Changing the M-Bus Primary Address: To change the M-Bus Primary Address, press and hold SELECT for 3 seconds. In the following menu MODE increases the address by 10, SELECT increases it by 1. When the desired primary address is set, wait until the main menu appears again. Secondary address: Using the secondary address, it is possible to communicate with the energy meter in accordance with the EN13757 standard. Wild cards can be used. Detailed information in the operating instructions. Caution! Before working on the current transformers, activate the voltage paths of the counter.This text is machine translated.