1. When testing the thermal relay test, the thermal relay cover should be covered. The small current value thermal relay uses a small current gear position. After connecting the three thermal components in series, it is connected to the corresponding test column, and the normally closed point is connected to the auxiliary contact column. Upper, the range switch is selected to the appropriate current gear position, the output adjustment handwheel is set to zero position, the self-locking switch is disconnected, check the contact of each terminal column should be good, turn on the power switch, press the start button, test the power supply, rotate the output Adjust the handwheel to the rated current of the tested thermal relay to make the bimetal reach a thermal stable state, and then stabilize the hot state and then rotate the output to adjust the handwheel so that the test current reaches 1.2 times of the rated current. The timing starts from zero and enters the test phase. Within the specified time of the motor protector tester, the thermal relay should trip to the qualified one, the thermal relay contact is disconnected, the test current disappears, the timing stops, and the test time is displayed. The end of the test signal is given by the light and sound, when it is to stop Press the acousto-optic switch to turn off the signal. When the test is rated, generally follow the procedure from the cold state of the thermal element to the other parameters of the thermal relay. Please refer to the relevant regulations, or select the safety-secondary tripping characteristics of the thermal relay according to the protected motor load.
2, measuring circuit breakers, motor protectors before the test should carefully check the various active parts, whether it is rusted, stuck, the moving shaft should have a small amount of grease, after the test is closed, manually touch the thermal trip, instantaneous trip Test again after error. The motor protector tester circuit breaker motor protector has the same auxiliary contact as the thermal relay. When the circuit breaker is disconnected, its signal is sent by the sensor of the shutdown device, the test power is turned off, and the test time is displayed. A test completion signal is issued.
3. The semiconductor circuit breaker should be inspected before the detection. The above-mentioned mechanical mechanism should also check the electronic components. The semiconductor switch has long delay, short delay, instantaneous trip and undervoltage trip. Features, etc. The test lead can be placed on the transformer attached to the switch and then connected to the corresponding end of the instrument for testing. The DC voltage of the instrument can also be applied to the first two points of the circuit breaker signal detection distribution circuit, or according to the manufacturer. The parameters or the load condition of the protected equipment are measured.
4. This instrument can be used for proofreading of electrical and instrumentation instruments such as AC contactors, AC ammeters, and current transformers commonly used in low-voltage power distribution. Motor protector tester Other relay protection devices, low-voltage electrical testing, please refer to the relevant regulations, standards, load properties and other parameters given by the manufacturer.
5. The measurement switch is selected to the AC450V or DC300V voltage position, the voltage output switch is turned on, the self-locking switch is closed, and the rotary output adjustment hand wheel can obtain DC 0~220V on the corresponding terminal, and the AC 0~450V is continuously adjustable. Output voltage.
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