Yokogawa 2491 AC Amps / AC Volts / Frequency Digital Switchboard Meters

Model 2490 includes Power Factor and Phase Angle measuring capabilities, as well as flexible options for Input Rating, Frequency, Analog Output and Communication options.

The POWER SERIES PLUS digital switchboard meter was developed by Yokogawa Corporation of America to provide our customers with a versatile AC digital power meter. The heart of our POWER SERIES PLUS meter is a programmable ASIC Power Measurement Chip (PMC) which was jointly developed by the General Electric Company and Yokogawa Electric Corporation.
 

The POWER SERIESPlus digital switchboard meter was developed by Yokogawa Corporation of America to provide our customers with a versatile AC digital power meter. The heart of our POWER SERIESPlus meter incorporates the latest DSP microprocessor technology. Careful and thoughtful design has resulted in a family of user-friendly, field-adjustable meters. The design of the POWER SERIESPlus combines a high accuracy digital switchboard meter with transducer output which can be configured in the field by an end-user, or when installed in new electrical equipment by an OEM. It eliminates requirements for a large inventory of dedicated instruments, and provides flexibility when new panel designs or system upgrades require changes in instrument transformer ratings. Our rugged metal case fits standard panel cutouts for switchboard meters and makes it a perfect replacement for less versatile instruments. The RS-485 communications option allows up to 32 meters to be networked together for remote monitoring and control. In addition, the POWER SERIESPlus can be set up and locked out for security via the remote communications option.
 

The design of the POWER SERIESPlus combines a high accuracy digital switchboard meter with transducer output which can be configured in the field by an end-user, or when installed in new electrical equipment by an OEM. It eliminates requirements for a large inventory of dedicated instruments,
 

and provides flexibility when new panel designs or system upgrades require changes in instrument transformer ratings. Our rugged metal case fits standard panel cutouts for switchboard meters and makes it a perfect replacement for less versatile instruments. The RS-485 communications option allows up to 32 meters to be networked together for remote monitoring and control. In addition, the POWER SERIESPlus can be set up and locked out for security via the remote communications option.
 

The POWER SERIESPlus is enclosed in a rugged steel case treated with zinc chromate to resist corrosion. The cover assembly and faceplate are constructed of high temperature polycarbonate material and have several gaskets which seal out dust and moisture from the front cover. The 26 position terminal board is a glass-filled polycarbonate material with #8 nickel-plated brass terminals inserted per the connection drawings for the model selected.

Set-up and Configuration

The POWER SERIESPlus can be configured for primary and secondary transformer inputs, legends, outputs and averaging function. At Yokogawa, we program each model according to the specified options required by the user. This minimizes the number of steps to set up the instrument at the job site or on the factory floor.

Each model is programmed only for the options selected, so there are no unnecessary menu items. If you select a Voltmeter without analog output, then set up will be limited to PT ratios, LED display, and average setting. All can be accomplished in less than one minute. If no transformer is required, the ratio entered for PT P and PT S is 1 (1:1).
 
Set up functions appear on the display as symbols. They are accessible when you press the MODE pushbutton located behind the front cover and beneath the LED display. After pressing MODE, you are in the setting mode “rSET” and can begin setting up. Error codes during set up mean your inputs may be incorrect or outside of the range of the instrument. Refer to the instruction manual for range/span restrictions for each model selected.

The pushbutton setting switches are described below. In order for a setting to be entered into memory, you must complete all entries for that mode such as: “PT P” and “PT S” (PT primary and PT secondary). If the values do not need to be changed from a previous setting, simply push the EN switch several times to go to the next mode.

After auxiliary power connection and removal of the cover, the instruction manual will guide you through set up. Pushbutton switches are located directly below the LED display. The POWER SERIESPlus can be set up before, or after installation in a panel. Once set up is complete, replace the cover and make the appropriate input connections.