Data Flow Systems TCU800, Инструкция по установке и эксплуатации

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A p p e n d i x H
H. CT Module
Definitions
• CT = Current Transformer
• Smoothed realtime = measurement which is actually and average of many realtime samples over one second.
Features
• Triplex pump currents can be measured with only one set (of 3) external CTs.
• Flexible configuration options to provide for a variety of use-cases.
• Alarming can be configured on overcurrent, undercurrent, and phase imbalance measurements.
• A new screen displays all three-phase information (voltage and currents).
Supported CT Part Numbers
Note: Any CT model can be utilized as long as it abides by the following requirements:
1. The CT must have a built-in shiunt resistor (the limits of the TCU800 CT inputs are 0.35 VAC).
2. The CT
should
output its maximum current at 333 mVAC (the “CT Rating” configuration parameter is based on the CT
current at 333 mVAC, so having a CT output its maximum current at 333 mVAC will make configuration easier).
Installing CTs
1. CTs will be mounted in a separate panel (where the 3 phase main breaker is located) from the TCU800.
2. CTs will be attached to the lines after the main breaker but before the individual pump starters.
3. A CT harness kit is available including the CTs and related terminal blocks for easy “snap in” assembly (the CTs are
split core so no rewiring is necessary).
4. CT secondary wirings will travel through shielded cable into the TCU800 enclosure through a separate conduit (the CT
signals are very low voltage - they must stay away from high voltage lines).
5. Single phase connections will only use the Phase B CT (P3-3 and P3-4) and Voltage (P1-2) wiring.
6. CT secondary cable must not travel in the same conduit as high-voltage cable (such as motor starter outputs).
Model CT Rating DFS Part Number
Accu-CT ACTL-0750-020 20 A 008-0076
Accu-CT ACTL-0750-050 50 A 008-0077
Accu-CT ACTL-0750-100 100 A 008-0078