My-PV ELWA Bedienungsanleitung

My-PV Durchlauferhitzer und Boiler ELWA

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ELWAÂŽ Modbus Interface Operation Manual 1018 , 17
ELWAÂŽ Modbus Interface
Operation Manual
1. Assembly
Before placing into operation it is essential to read the assembly instructions provided with the
device and the ELWA manual.
2. System requirements
The ELWA Modbus Interface can be used with all ELWA devices with rmware Version 1.30 or
high . Devices with serial numbers lower than 120100160810xxxx are equipped with earlier er
rmware versions.
To update the ELWA rmware USB Interface required. The update is not possible by a is
using the ELWA Modbus Interface.
If the ELWA Modbus Interface is used in combination with the Smart-Home System
LOXONE, the "Loxone RS485 Interface" and not the "Loxone Modbus Interface" has to be used,
otherwise Bus conicts may occur.
The latest software packages are available at www.my-pv.com.
3. Operation displays
The 3 LEDs on the top are the operation displays on ELWA. Functions are described in the ELWA
instruction manual.
The green LEDs underneath show the operation condition of the ELWA Modbus Interface: 3
No LED light no power supply :
all 3 LED blinking: no connection to the ELWA
upper LED light: connection to the ELWA ok
middle LED light: Modbus order received (timeout approx. sec) 5
LED operation display
Green ( ELWA) on
Yellow (on ELWA)
Red ( ELWA on )
green
green
green
ELWAÂŽ Modbus Interface Operation Manual 1018 , 17
A proper communication between ELWA und ELWA Modbus Interface is only possible with
exact positioning (see assembly instructions).
4. Pins
Power supply Either with the provided power supply unit via Micro USB interface
(5VDC) or with -24V DC at the two pins +24V/GND 12
Temperatur sensor Connect the provided temperature sensor at the two e „Temp“ pins.
Polarity does not matter.
Modbus Connect the Modbus at the pins A D+ and -. B D
Consider polarity!
5. Functionality
The ELWA Modbus Interface is a link between the ELWA and a Modbus based bus system.
Because of the bus capability the allocation of bus addresses is required when there are
multiple devices in operation (register 1030).
The bus address is saved the interface, not in the ELWA. in
Furthermore the interface can control the hot water securing of ELWA by the provided
temperature sensor. For this purpose the following settings have to be made:
The hot water securing (Boost) even is operative without an active Modbus.
Assuming that the additional temperature sensor in the boiler is positioned higher than the
ELWA, it is recommended to set the boost-temperature on the interface ( a little register 1009)
higher (e.g. 70 °C). Thereby the ELWA-internal control for hot water securing can be
circumvented.
The ELWA-internal control of the boost-time needs also to be adjusted. The corresponding entry
( ) has to be set to 1441. register 1020
ELWAÂŽ Modbus Interface Operation Manual 1018 , 17
If the sensor (see gure) indicates a value >80 °C the pins may not be connected correctly or
there might be a sensor break. A negative value can be an indication of a short circuit.
Terminating resistor in the b system us
Bus systems are high-resistive. For this reason, a terminating resistor (120 Ohm) must be set,
ideally at the most remote location of the bus master. The resistance is included in the package.
6. Modbus register description
Modbus RTU Standard Comm parameters 9600/8/N/1 All registers unsigned int (16 bit) , ,
Register Address mode Content
1000 R Operating Day Counter
1001 R/W Operation mode (see Table 1), write 1 skips 10 minutes startup delay
1002 R DC Breaker status, 0: open, 1: closed
1003 R DC Relay status, 0:open, 1: closed
1004 R/W AC Relay status, 0: open, 1: closed write to register starts/stops ELWA AC relay ,
1005 R Temperature in 1/10°C
1006 R Current Water Temp Day minimum in 1/10°C
1007 R Current Water Temp Day maximum in 1/10°C
1008 R DC Temp Setting in 1/10°C
1009 R/W AC Temp Setting In 1 / 10°C
1010 R Internal Temperature of Electronics in °C
1011 R DC Isolation value
1012 R Voltage 0.1V DC
1013 R Current mA DC
1014 R Power in W DC
1015 R Current Day DC Energy in Wh
1016 R Total DC Energy kwh
1017 R Current Day AC Energy in Wh
1018 R Internal clock (minutes from noon)
1019 R Minutes since current day wakeup
1020 R/W AC boost mode, AC switch on time in minutes from noon
0 ELWA internal temperature controlled
1-1440 ELWA internal time controlled in minutes from noon
>1440 ELWA internal control o, controlled via ELWA Modbus Interface

Produktspezifikationen

Marke: My-PV
Kategorie: Durchlauferhitzer und Boiler
Modell: ELWA

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