Thread Content
TRG indication sequence, TRG indication and electric pump status, possible failure points, inspection or treatment methods: 1. The pointer gradually increases in value, does not oscillate, and sometimes operates poorly. This can be caused by an increased supply voltage or increased bearing wear. First check whether the terminal voltage is normal, then examine the degree of bearing wear; if it exceeds the acceptable limit, replace the bearings. 2. The pointer oscillates irregularly, the flow rate and pressure of the electric pump are unstable, there are abnormal noises inside, and sometimes the ends of the pump heat up. This is due to problems with the circulating fluid system, such as insufficient flow or the presence of bubbles. Check the circulating fluid pipelines and ensure that the type of electric pump meets the requirements of the process. 3. The pointer suddenly rises to the red area, with increased amplitude of oscillation and regular fluctuations. Sometimes, after shutting down and restarting the machine, the fault disappears. The expansion of the rotor bars causes local breaks in them; a new rotor of the same model should be installed. 4. The gauge pointer suddenly rises to the red zone, its swing amplitude increases, and there are regular fluctuations accompanied by abnormal noises coming from inside the pump. The impeller wobbles, the shaft bends, and the mouth ring is worn out. The electric pump casing needs to be disassembled to inspect and repair the damaged parts. 5. If the gauge pointer is above 0.75, the operation is not smooth, with low flow and pressure. The phase sequence may be reversed; check the power supply’s phase sequence and reconnect it properly. 6. If the gauge pointer is within normal range but the operation is not smooth, with low flow and pressure, or if the operation is normal but the gauge pointer is above 0.75, it means that the phase sequence of the three-phase power supply does not match that of the motor terminals. The TRG is connected in reverse to the heating element circuit. Check that the phase sequence of the module’s three-phase power supply and the motor terminal wires is correct; if the gauge pointer reads normally but the operation is not smooth, with low flow or pressure, or if the pointer is above 0.75 when operation is normal, it indicates that the phase sequence of the module’s three-phase power supply and the motor terminals is incorrect. The TRG is connected in reverse to the heating element circuit. Check that the phase sequence of the module’s three-phase power supply and the motor terminals is correct. If the needle on the gauge reads more than 0.5, it indicates a zero current in one phase, which suggests a broken wire. Inspect the power cables and ensure they are connected properly. If the needle fluctuates or moves back and forth, this is a temporary phenomenon caused by foreign objects in the pipeline, or crystals or deposits in the working fluid. Check the working fluid and the circulation pipeline to remove any such foreign objects. If the electric pump is working properly, yet the reading remains above 0.75 regardless of whether the power cables are connected correctly or not, and if the pump stops running for a while before starting again, then the issue lies in a damaged module or TRG, or there may be a ground fault in the TRG system circuit. Check the input and output electrical parameters of the module, as well as the connection points of the module, circuit board, and various electrical circuits. If the needle shows no indication or reads in the opposite direction, it may be due to incorrect polarity when reassembling the module after inspection. The instrument is damaged, or the wrong module has been selected. Check the instrument and the type of module used, as well as whether the mounting holes of the module and the polarity of the instrument are correct. The pointer of the gauge does not move at a certain position – this indicates a jammed pointer; remove the instrument to inspect it. In case the insulation between the main circuit terminals and ground is zero, or if the pump fails to start, it could be due to damaged wiring connectors, damaged modules, or damaged main windings. The TRG is connected in reverse to the heating element circuit; remove both the module and the main winding from the wiring rack and inspect them separately