KOLLMORGEN S72402-NANANA-NA-225 Communication gateway module

In a like manner, the second CT is tried on each of the two remaining CT input terminals in each polarity, then connected, in the correct polarity, to the terminals which produced the most positive load signal voltage. The remaining CT is then connected to the remaining CT input and the load signal checked for each polarity. This CT is then connected to the CT input, polarized so that it produces the most positive load signal voltage. When the procedure is completed, all three CTs are connected to the proper CT inputs on the Load Sharing Module, with the correct polarity, and are now labeled with their correct designations.

The procedure for correcting phase wiring requires

 that the generator set be shut down and the current transformers disconnected many times. For convenience during the phasing check, the temporary method of connecting the current transformers shown in Figure 4-1 is recommended. By connecting a burden resistor (a 0.5 Ω, 20 W resistor), across each current transformer, that current transformer can be disconnected from the Load Sharing Module after removing all load. The connections between the terminal strip and the Load Sharing Module can be changed with the generator set running; however, remove all load before any changes in connections are made. Do not disconnect a wire from a current transformer with load on the system. After completion of the procedure remove the terminal strip and the resistors.

For this procedure

the generator set must be running isochronously, not paralleled, and with a power factor greater than 0.8. 1. Start with the generator shut down. 2. Label each CT wire with the phase and polarity that you think it should be. Even though this identification may prove to be wrong during this procedure, this step is necessary so that the individual wires may be identified during the description of the procedure. 3. Disconnect the phase “B” CT wires from terminals 6 and 7 and connect these two wires together. Use a small screw and nut and tape the connection. 4. Disconnect the phase “C” CT wires from terminals 8 and 9 and connect these two wires together. Use a small screw and nut and tape the connection.

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