Soft starter test conditions

In terms of the complexity of the circuit configuration, the soft starter is much simpler than the frequency converter, so the repairing difficulty is relatively small, it goes without saying. However, the repaired test machine is a little troublesome. In the end, if it is fixed, Sinol teaches you how to find a way to create test conditions to confirm the success of the repair. Sometimes, whether the test machine can guarantee the survival of the machine.

1. Start the operation requires the control terminal or panel to give the corresponding signal, which is similar to the inverter, not much to say.

2. A three-phase AC power supply is required. Inverter maintenance, single-phase power supply or DC 500V, can solve maintenance and even test problems. The soft starter must have a three-phase AC power source to generate a reference signal for the phase shift trigger pulse (referred to as the grid synchronization signal). Without three-phase power, the system loses its working premise. Some maintenance departments have ready-made three-phase power supplies, that is, there is no such problem. In some places, when there is only a single-phase lighting power supply, when you need to repair the soft starter and DC governor, you must make or purchase a three-phase repair power supply. This is a hard indicator in the maintenance conditions.

3. A current detection signal is required. The inverter can test the machine without load, and the soft starter needs to detect the running current:

1) Determine whether the three-phase power supply and load are normal or not;

2) According to the detected current signal, it is one of the reference conditions for switching between soft start and power frequency operation;

3) When the current detection signal is 0 at startup, it immediately alarms and ends the startup action. The acquisition of the current detection signal can be said to have a three-phase power supply, and there is no such load capacity (power supply condition, cable cross section, motor power, etc.), which is the most difficult test condition.

When the output voltage is tested at no load, especially when the AC multimeter of the digital multimeter is used, the detection value is not accurate due to the existence of leakage current of the thyristor and the high resistance input of the voltage block (there are several hundreds when not started). Volt voltage indication), it is recommended to carry the test (even with a small light bulb or a resistor). In addition, with the AC voltage block of the pointer table, the effect is particularly good (sometimes the back and forth swing of the pointer indicates that the repair has been successful).

The above is the soft starter to check if he is repaired after repair.