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ML0021 August 15, 2018
94
Copyright 2018 Bitronics, LLC
Signal Input Module S2C Used with Split-Core CTs on M872
7.5 Voltage Input (VT) Connections
The voltage terminal block is removable after unscrewing the mounting screws on the ends
of the block. Voltage signals are measured using a 7.5M
Ω
resistor divider with a
continuous voltage rating of 7kV. This ideal impedance provides a low burden load for the
VT circuits supplying the signals. Wiring diagrams, which represent the various
measurement configurations that are applicable for the instrument, are provided in Figure
9. Grounding of VT & CT signals per ANSI/IEEE C57.13.3-1983 is recommended. The
polarity of the applied signals is important to the function of the instrument.
The Auxiliary Voltage Input channels (M871 only) are physically identical to the other
voltage inputs on the Signal Input Module.
7.5.1 Overcurrent protection for Voltage input (VT) Connections
To maintain the safety features of this product, a 3 Ampere time delay (T) fuse must be
connected in series with the ungrounded/non-earthed (hot) side of the supply input
connected to the voltage measurement (VT) input of the instrument prior to installation.
The fuse must carry a voltage rating appropriate for the power system on which it is to be
used. A 3 Ampere slow blow UL Listed fuse in an appropriate fuse holder should be used
in order to maintain any UL product approval.
Содержание Bitronics M87X Series
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Страница 32: ...ML0021 August 15 2018 16 Copyright 2018 Bitronics LLC Figure 2 Mounting and Overall Dimensions C07A5...
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Страница 114: ...ML0021 August 15 2018 98 Copyright 2018 Bitronics LLC Figure 9 Signal Connections M871...
Страница 115: ...ML0021 August 15 2018 99 Copyright 2018 Bitronics LLC Figure 9 Signal Connections M871...
Страница 116: ...ML0021 August 15 2018 100 Copyright 2018 Bitronics LLC Figure 9 Signal Connections M871...
Страница 117: ...ML0021 August 15 2018 101 Copyright 2018 Bitronics LLC Figure 9 Signal Connections M871...
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