4 Operational Description
4.1
Input Settings
4.1.1
Introduction
This chapter contains operational description of the hardware functions of the Mavosys 10, configurable through Encore Series Software or through the optional user interface when installed. Section A describes the external communications device and software applications necessary for remote operation of Mavosys 10. Section B describes the Mavosys 10 as a stand-alone unit with the LCD screen installed.
For detailed information on Mavosys 10 remote operation, refer to the Encore Series Software User’s Guide. For local operation and functional screen display, refer to the Mavosys 10 Optional User Interface Guide (check with GMC-I Messtechnik GmbH for availability).
4.1.2
Virtual analyzer platform
The Mavosys 10 uses the concept of virtual analyzers to interface with the modular design of the mainframe. Mavosys 10 operation is
dependent on the type of input/output modules installed on the rear panel of the instrument. As described in Chapter 2 Controls, Indicators, and Connectors on page 4, the Mavosys 10 Standard can have a maximum of 4 modules, with separate and independent con-
nection for each input/output module. The user can configure up to four virtual analyzers, depending on module types installed. The instrument is factory-set to pair voltage and current modules in adjacent slots together as a virtual analyzer. If the two sets of voltage and current modules are present, there will be two virtual analyzers. If one voltage and three current modules are present, each current module will be paired up with the voltage module to make three virtual analyzers.
Virtual analyzers operate independently of each other. Each has its own set of functional icons in the local user interface, which when pressed allows users to view data from. For example, after the user selects Virtual Analyzer 2 configured to monitor voltage and current data, the user can then press the Meter icon to view voltage and current meter values. Similar concept applies to Scope, Harmonics,
Trend, Events and Setup. Virtual analyzer tag names can be specified by the user, for example “UPS#4”.
4.1.3
Circuit type
You must select a circuit type when you are collecting data for power parameters such as watts, VAs, PF, and VARs. If you don’t select the proper circuit type, the ABC totals will not be calculated correctly.
Mavosys 10 can monitor the following power configurations:
• Single Phase
• Split Phase
• 3 Phase Wye
• 3 Phase Delta
• 3 Phase 2-Watt Meter Delta
• Generic
• 2 1/2 Element without V Chan B
• 2 1/2 Element without V Chan C
While monitoring any of the above configurations, Mavosys 10 can also be connected to monitor neutral to ground voltage and neutral to ground current.
4.1.4
Scale factors
Definition: Scale factors are the ratio of input to output for a particular current transformer (CT) or potential transformer (PT). Scale factors are entered into the Mavosys 10 (from the Encore Series Software or local user interface) and then multiplied automatically by the measured voltage and current so that the correct values will be recorded and displayed.
If voltage and current connections are made without using any of the above named devices, the scale factor should be set to 1.
When to use: Scale factors other than 1 must be entered for the following conditions.
• A GMC-I Messtechnik GmbH current probe is connected to a permanently installed CT.
• The current connections are made using a GMC-I Messtechnik GmbH ISO box.
• The voltage connections are made using a PT.
Range: The scale factor that is entered into the user interface must be between 0.001 and 999,900.
Memory Functions
4.2
Data Collection
4.2.1
Real-time monitoring
Mavosys 10 allows you to view power quality phenomena as it happens, when it happens. The instrument is able to capture and process data in real time, and allows users to view it in Scope mode and Meter mode.
4.2.2
Event monitoring
The data collection function of the Mavosys 10 controls how timed and disturbance events are recorded and saved to memory during monitoring of an electrical system. This function consists of the settings for the interval for timed readings, parameter thresholds, and waveform capture.
4.2.3
When to monitor events
Mavosys 10 can monitor an electrical system in situations where scope or meter measurements in real time do not give the data that you need to diagnose a problem. The length of time you monitor a circuit can vary from a few minutes to a few weeks or more depending on your application.
GMC-I Messtechnik GmbH MAVOSYS 10–34
