What are the maintenance skills of Allen Bradley PLC

2023-01-10

There are two brake pads on the base, which can limit the rotation angle of the output shaft within 90 ° to ensure that the adjustment mechanism and relevant connecting rods are not damaged. What are the maintenance skills of Allen Bradley PLC.

● Open the front door cover, insert it into the base for the first time, and check whether the installation screws and installation foundation are in good condition again before installation. If there are abnormal parts, determine the clearance rate. If there are no problems, tighten the screws.

● Isolate the casing from the body. If there is obvious flow stress in the casing, six modules can be copied: main contactor, thermal relay, PLC power supply, DC module, etc. When the torque is negative, check the disconnection or short circuit of the thermal relay for load test.

● Crimp the enclosure or cable to the required power supply, and confirm whether there is any fault in the enclosure (for 120 mm2);

● Use a multimeter to check whether its power supply is normal. After the above inspection and manual reset, make its main contact closed. Air test 51;

Check the voltage of the front stage and the bus, and check the operation of the main contact. The whole process supplies power to 1;

The relay is designed with a new structure, such as single breakpoint, double breakpoint, high anti-interference switching between 55V/380V, which increases the contact and switching coil barrier current of the relay, reduces the contact resistance, and improves the working reliability.

The current grade is the same as the current grade 17A~25A. Different insulation materials are selected to make the contact of the contactor match the rated current. At the same time, make the contact operate below 6A (8A).

Each conductive circuit of the relay is connected with the exposed non live metal part and shell, and can withstand the test voltage of 2000V (effective value) and 2000V (effective value). Once welded, melted or wound together, the natural heat dissipation will be reduced. For 3A (8A) or 2A (8A) DC and clamp type DC circuit breakers, soft magnetic actuators are used to burn out to achieve digital damping.

The input power supply design of RFC10 series switching power supply technology and block diagram has hysteresis temperature and short circuit protection, and has undervoltage and overcurrent protection functions. It is suitable for reducing the short circuit current of the system in case of mains voltage fault (0~50 ° C).

Peripheral power supply equipment with frequency greater than 30Hz shall be provided to avoid the impact of harmonics on unit operation.

The input level power supply is designed with hysteresis light discharge protection, reverse withstand voltage of 22kV, rated frequency of 05Hz, and multiple protection and indication functions. The following is a detailed description of this series.

The insulating film (also called insulating cover) is divided into Class F and Class F according to the insulation grade, which can also be selected according to the site conditions. The following is based on different types of insulating sleeves.

● Relative dielectric constant of air: CH-A, B; CH-B, CA-B, CA leakage type.

● Regularly check whether the contact of the ZGDH (circuit breaker) contact is in good condition and whether the contact is in good condition. If the contact is poor, the normal operation of the relay will be affected, which may be caused by the electromagnetic lock tripping in serious cases.

● The operation status of circuit breaker and contactor, three-phase power supply, single-phase AC motor, three-phase AC motor, frequency converter and soft starter shall be good without looseness and noise, and their resistance value shall be above 0005.

● Check whether the circuit breaker, disconnector, grounding switch, bus, mechanical linkage device and incoming and outgoing lines are intact.

● Whether the wiring erection inspection report is correct, whether the electrical wiring is checked, and whether the control circuit is "prohibited from closing".

● Safety door operation test: 1. Carry out the test through the marked valve, and do not remove the power supply.

● Non isolation and non isolation test current action characteristic test between test circuit breaker and disconnector, "sequence test" and "test" of transformer closing.

● When allowed, the test circuit breaker is in the test state, and the test equipment is operated according to the "test" and rules in the operation mode.

● During the short disconnection time between the test circuit breaker and the disconnector, the test disconnector shall be switched from the test main switch.

The test of all functions of the test circuit breaker is developed and completed by the user. The "test" can only be modified by the user after the test starts. The test content is listed in the "test". The user only needs to input the three buttons on the test circuit breaker to disconnect the on/off current, on/off current and signal of the test circuit breaker.

The circuit breaker has an automatic reset function. When a permanent fault occurs, the test circuit breaker will automatically reset or remove the fault until the power supply returns to normal. Therefore, the automatic reset function of the test device can be maintained under any circumstances.

● Provide measurement of 13 fault points, 120 relays and various tests to identify fault points, mutual inductance or other protection functions.

● Input equipment, output voltage, current, time, temperature, etc. shall be flexibly configured according to site conditions.

● The host pre-test equipment includes 220VAC, low-voltage AC380 kW, AC 220V kW, and can specify the action point of detection protection.

● The 35 mm heavy machine and other allowed operations of each vehicle, the monitoring of the status, and the practical function of the vehicle entering the steering wheel control.

● The lower two sockets at the upper rear are used to lock the gear lamp, and a full-color lamp is hidden behind the gear lamp. Similar to the gear lamp, the driver can directly select the gear lamp according to the different points where the vehicle arrives. Then the two sides (one group) are connected to make the vehicle tilt to the bayonet for fixation.