The power supply unit is built from the latest high efficiency switch mode technology which can operate over an
ultra wide voltage range from 85 to 460VAC. It can also be operated from a DC supply. It does not use opto
isolators, which was a weakness in older designs. It uses synchronous rectification in the secondary to achieve
the highest efficiency levels, which in turn keeps the temperature low. It has multiple layers of protection
including:
●
Supply over-voltage protection
●
Under voltage protection
●
Protection from large in-rush currents
●
Protection from surges
●
Secondary over voltage protection
●
Short circuit and overload protection
●
Automatic recovery from temporary overload
●
PSU over-temperature protection
●
Safety isolation to CAT II 600V
Power is distributed to various functional blocks throughout the system with further protection and isolation to
prevent hazardous voltages from leaving the system and from entering the system.
Communications
There are a variety of communication options on the ZDR that are used to configure settings, stream live sensor
data and poll 3rd party systems for data. This section describes the communications capability of the ZDR, with
information on wiring, configuration and safety considerations.
RS-485 Wiring
This section will be completed in a future release of the user guide. Information to be included:
●
Wiring diagram and instructions for connecting the ZDR to an RS-485 bus (polarity, etc.)
●
Using terminating resistors
●
What type of wire should be used (twisted pair / shielded)
●
Maximum distances and max. number of slave devices
●
How to configure baud rates and other parameters on the Gateway UI
Modbus
This section will be completed in a future release of the user guide. Information to be included:
●
Modbus Master vs. Slave
●
Node Profiles
●
Supported modbus data classes (coils, registers, etc.)
●
How error codes are handled
Page 21
of 37
