SMN-1 ABB drawer switch cabinet contact clamping force tester

I. Overview

Due to the various low-voltage switchgear devices used in the power system, especially outdoor switches that operate in atmospheric environments and are exposed to weather conditions for a long time, the operating conditions are relatively harsh, which can easily lead to mechanical and electrical failures. In particular, the contact parts of the contacts are corroded by gas, resulting in poor contact and heat generation. The pressure spring of the contacts is annealed due to heat generation, causing a vicious cycle of contact heating and ultimately burning out the contacts, leading to accidents. During maintenance, only the obviously failed and broken contacts are often replaced, and the spring contacts with reduced pressure cannot be compared and replaced. Therefore, in long-term operation, the distribution of current in each contact will be different due to different pressures. The greater the difference, the more uneven the current distribution. Poor contact of one contact will affect the entire switchgear. Normal operation, Causing accidents to electrical equipment in operation.

The SMN series contact pressure detector uses 5V0 constant voltage excitation to power the 1-5K pressure sensing resistor bridge, and data is collected by an external 24 bit high-precision A/D under the same 5V0 reference. Select various measurement methods from the bilingual prompt software menu in both Chinese and English. After data processing, it is displayed on a high brightness green 12864 dot matrix active light-emitting OLED screen. And there is a buzzer reminder and dedicated green and red OK and OUT lights to indicate whether the output result is qualified or not. It is a specialized measuring instrument used to check whether the contact pressure of power equipment is qualified.

Instrument working mode:

Divided by settingsCalculate the contact pressure of the measurement display using three methods: "key measurement", "automatic", and "continuous".

Startup byCompare the comparison type and upper and lower limits of 24LC64 loaded into RAM to determine if the contact pressure is qualified.

If qualified, the buzzer will sound continuously0.5 seconds and the OK green light stays on, and the measurement value is displayed on the main screen.

If it is not qualified, the buzzer will beep three times rapidly and brieflyThe OUT red light is constantly on to sound an alarm, and the measurement value is also displayed on the main screen.

2、 Product Features

1. Multi functional display screen

2. Convenient bilingual four key operation interfaceAnd it can be measured with a dedicated one touch key.

3. Freely customizable measurements and judgments定方式

4．Concise calibration method

3、 Technical indicators

The main technical specifications of the SMN series contact pressure detector are:

SMN-1 ABB drawer switch cabinet contact clamping force tester

4、 Description of each functional component

5、 Parameter settings

1．Working interface of the detector See Figure 1

The working interface of the integrator includes five interfaces, with the screen being the main interface and the second screen being the auxiliary interface.

The main screen interface is shown in Figure 1:

The measurement result is generated by pressing the test button or inserting the probe in automatic mode, and the result is displayed approximately every 3 seconds in continuous mode.

The zero point calibration of the second screen is shown in Figure 2:

When the test head is empty and not loaded, enter the password "10" to complete the on-site zero calibration and reset to 0.

2. Display of working status

After the power switch is turned on, the instrument first performs a self check and enters the screen after completion1The work master displays the status.

2.Switching between work screens

press “<” Key orSwitch between the main work screen 1 and the auxiliary work screens 2 and 3 with the "+" symbol.

2.2-button measurement method

pressAfter pressing the "Test" button, clear the screen values and results and turn off the traffic lights. Then, perform a set of sampling calculations and comparisons, and display the new measurement results after a delay of 0.5 seconds.

2.5 Parameter Settings

On the display screen3 status, text prompt "Enter password", use "S,+",◄，Enter the password using the "E" key combination.

E "key: Enter the initial password input state. S "key: Cancel input mode and return to the main screen display.

Press in input mode“+”Press the key to cycle through the values 0-9 and symbols at the cursor.

Press in input mode“<”Press the key to move the current input cursor position.

Press in input modePress the "E" key to bring up the cursor or confirm saving parameters.

If it is correct, enter the menu; if it is incorrect, return to the initial input state.

6、 Instrument calibration and production settings

1．Tester menu

The detector menu includes a user menu, an engineer menu, and a manufacturing menu. The engineer menu must be set by operators with professional knowledge. The production and manufacturing menu is calibrated by the factory when the detector is sent out. After leaving the factory, this type of parameter setting can only be modified under the corresponding equipment conditions, otherwise it will cause measurement errors or failure of the detector!

In the menu browsing, pressPress the "+" key to scroll down; Press“<”Flip up the key. Press the "S" key to return to the work screen 2 interface. In the submenu, press the "S" key to exit; Press the "E" key to enter the modification mode. If you want to modify the selection item in the modified state, press the "+" key to select downwards; Press“<”Select upwards and press the "E" key to confirm. If it is an input based modification, follow theinput operationconduct.