TCI HGA Manual - Manual (Page 52)

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have failed or something more serious with the operation of the converter. For this reason this
fault will latch and will remain latched until power is cycled. The indicator light located on relay
CR-2 will not be lit with this type of over temp fault.
Troubleshooting
Current Transformer Orientation Troubleshooting
Failure to maintain the correct polarity and phasing of the current transformers (CTs) will cause an
over current fault on power up. The converter will never attempt to run; it will stay in a stopped
condition. Possibly the CTs are installed backwards or the secondary wiring is incorrect, if this is
suspected refer to the steps below to isolate the error.
Note: CT operation can be verified via the HMI touchscreen feedback waveform plot screens.
Reference the HMI VLine & ILine Waveform Plot Sub Screen in Section 6 for details.
Warning
Only qualified electricians should carry out all electrical installation and maintenance work on the
HGA. Failure to follow standard safety procedures may result in death or serious injury.
Disconnect all sources of power to the drive and HGA before working on the equipment. Do not
attempt any work on a powered HGA. Also, check for zero voltage between all phases of the input and
output lines.
Operating current transformers with the secondary winding open can result in a high voltage
across the secondary terminals which may be dangerous to personnel or equipment.
1.) If the CTs and wiring is easily accessible double check the CT orientation for proper direction, and
trace the secondary wiring against Figure 4.3 for polarity, phasing and connection to terminal TB-
1. Correct any errors and apply power for proper power-up, if it doesn’t clear the fault or if
accessibility is too difficult proceed to step #2.
2.) There is a possibility that the CTs markings are different from Figure 4.3. This could affect the
polarity, to verify this try reversing the two leads on TB-1 positions 1 &2, do the same with wires
in positions 3 & 4. Apply power for proper power-up; if it doesn’t proceed to #3.
3.) Reverse just one set of CT leads at a time, first # 1 & 2; verify power-up. If it doesn’t work put
wires 1 & 2 back and now try the same with wires 3 & 4. Apply power for proper power-up; if it
doesn’t replace all wiring to its original positions, and proceed to #4.
4.) There is a possibility that the phasing of the CT L1 and L3 are incorrect. To test this theory swap
the two wires on TB-1 positions 1 & 2 with the two wires in positions 3 & 4. Apply power for
proper power-up; if it doesn’t repeat steps 2 and 3.
5.) If the HGA doesn’t indicate a run status after completion of steps 1 through 4 contact TCI
technical support for further assistance.
System Failure
The Digital Signal Processor is continually monitoring the performance and fault status of the filter. It
will shut down the converter section if the processor should sense a fault. The filter is also equipped
with a circuit breaker providing a second layer of over current protecting for the converter section. The
circuit breaker can also serve as a means of electrical isolation from the system power grid. It is
recommended by TCI that all power to the HarmonicGuard Active filter be disconnected. If you elect
to service the HGA by using the circuit breaker to isolate the converter section, please take special note
of the following warnings:
Warning Many electronic components located within the filter are sensitive to static electricity. Voltages
imperceptible to human touch can reduce the life, and affect performance, or destroy sensitive
electronic devices. Use proper electrostatic discharge (ESD) procedures when servicing the filter and its
circuit boards.