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•
0 V: the device is in STOP mode
•
0.5 V: charge pump (Q9) shuts down
•
1.5 V: charge pump starts
•
2 V: heat request 0 %
•
6 V: heat request 50 %, the first compressor starts
•
10 V: heat request 100 %, the second compressor starts
The second compressor shuts down when the capacity drops to 50 %, and the first compressor shuts
down when the capacity drops to 0 %.
9.10 Wireless sensor settings
An optional wireless measurement system for indoor conditions is available to Gebwell's heat pumps.
The system includes a Modbus base station and wireless sensors. The sensors can be used to read the
temperature and relative humidity of a space. The controller's software currently supports ten sensors.
You can enable the system in the service menu, under Commissioning / Wireless sensors.
The Modbus settings of the base station (address, parity and stop bit) can be
found in the installation instructions that come with the system.
•
Nr. of wireless sensors: number of sensors (factory setting = 0)
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Addr. wireless base station: address of the base station (factory setting = 1)
•
Baud rate (factory setting = 9600)
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Parity (factory setting = None)
•
Stop bits (factory setting = One)
These settings will take effect when you restart the controller.
9.11 Settings for communications links
You can set the Modbus settings in the service menu, under Communication.
Modbus communication
The Modbus communication link enables the device's temperatures, status information, setpoints and
malfunctions to be read by a higher-level automation system. Via the Modbus connection, Gebwell's heat
pumps can be controlled by sending a heat request in percentages (%) or a setpoint in Celsius degrees
(°C).
The master-slave protocol means that one master device and at least one slave device are connected to
the same bus at the same time. The master always begins data transfer. Slave devices do not
communicate with each other, nor do they send requests or other messages to the master device unless
the master specifically requests this. In a precise transmission, the master first sends a request to one
particular slave device and waits for a response. The slave device has a unique address from 1 to 247.
Taurus heat pumps support the following Modbus versions: serial port (RTU) and Ethernet (TCP).
Taurus Inverter Pro and Taurus EVI
Installation, Commissioning and Maintenance Manual
© 2023 Gebwell
9 Heat pump settings
Version: 2-1 12/04/2023
Page 78
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