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Do electronic products need to be inspected again after packaging and before delivery? Operation instruction of LCH-SD600 digital MCC protection control management device.
Baoding Licheng electricity co., ltd
I. Overview
1. 1 purpose
LCH-SD600 digital MCC protection control management device (hereinafter referred to as the device) is a low-voltage intelligent power distribution product developed by our company. This product is designed for AC 380V low-voltage motor, which integrates the functions of protection, measurement, signal and display, and realizes the comprehensive protection, measurement, operation and control of low-voltage motor.
1.2 model and its significance
LCH–SD–600
1.3 usage environment
A) Ambient temperature:-10℃ ~+55℃,
B) Storage temperature: -25℃ ~+70℃. Below the limit value, the device will not change irreversibly without excitation. After the temperature is restored, the equipment should be able to work normally;
C) Relative humidity: no more than 85%;
D) atmospheric pressure: 86 kpa ~106 kpa;
E) No explosive medium is allowed in the place of use, and the surrounding medium should not contain gas and conductive medium that corrode metals and damage insulation, and it is not allowed to be filled with steam and have serious mildew;
F) The place of use shall be equipped with rain-proof, snow-proof, wind-proof, sand-proof and ash-proof facilities.
Technical characteristics of 1.4
The device has the following main technical features:
A) integrating protection, measurement, signal and display functions;
B) It has various protection functions such as short circuit, locked rotor, overload, grounding, low voltage and short circuit. , all functions can be turned on/off;
C) Electrical parameters such as current, voltage and current unbalance rate can be measured;
D) It has an independent protective action (or alarm) exit, and has the functions of protective action memory and signal retention;
E) the overall size is miniaturized (150mm×78mm× 145mm), which is suitable for various types of switchgear;
F) The advanced industrial-grade chip is adopted, the bus does not leave the chip, and the electrical isolation and electromagnetic shielding design meet the relevant standards, so that the hardware system of the device has high anti-interference ability and working reliability;
G) The protection principle is mature and reliable, and can stand the test of long-term field operation;
H) LED status indication, customized LCD screen, dot matrix Chinese display screen and friendly interface.
I) The main chip adopts surface mount technology, and the structure is plug-in whole board structure.
Second, the main technical parameters
2. 1 working power supply
A) rated power supply voltage: 220V, and allowable deviation: DC-20% ~+ 10%.
AC- 15% ~+ 10%
B) ripple coefficient of b)DC power supply: no more than 5%.
C) Rated frequency: 50Hz, allowable deviation:-5% ~+5%;
2.2 AC circuit
A) AC current: 5a ~ 150a (4 ~ 75kW motor).
B) rated frequency: 50HZ
2.3 Overall dimensions
Width× height× depth =150 mm× 78 mm×145 mm.
2.4 Temperature influence
At the temperature of-10℃ ~+55℃, the change of action value caused by temperature change does not exceed 5%.
2.5, contact ability
The maximum conduction current of the relay contact at the outlet of the device is 5A/AC220V.
2.6, insulation performance
2.6. 1, insulation resistance
Under standard test atmospheric conditions, the insulation resistance of the equipment meets the requirements shown in Table 2-2.
Table 2-2 Insulation Resistance of Device
Insulation resistance of test point > 100 megohm.
The open circuit voltage of AC current loop is measured by 500V shaking table.
Between AC current and AC voltage circuit
Between AC circuit and DC circuit
Measure the open circuit voltage of DC power supply circuit with a 500 volt shaking table.
Open circuit to ground
Open the grounding contact
Between open-loop and open-circuit contacts
2.6.2 Medium strength
Under the standard test atmospheric conditions, the device can withstand the power frequency withstand voltage test shown in Table 2-3 without breakdown or flashover for one minute.
Table 2-3 Power Frequency Withstand Voltage Test of Device
Test field withstand voltage level (power frequency/minute)
Ac circuit to ground 2000V
2000V between AC current and AC voltage loop.
The power supply loop is grounded to 2000V V.
2000V between AC circuit and power supply circuit
Open 2000V V to ground.
The driving contact 500V is grounded.
500V between open circuit and open circuit contact.
2.7 impulse voltage: the device can withstand the standard lightning impulse test shown in Table 2-4.
Table 2-4 Standard Lightning Wave Impact Test of Device
Test on-site impulse voltage
The AC circuit is grounded at 5000 volts.
The power supply circuit is 5000V to the ground.
Open the loop and ground it to 5000V V v.
Open-loop grounding1000 v v.
2.8 anti-electromagnetic interference performance
2.8. The ability of1to resist sudden interference. The device shall be able to withstand the sudden interference test with frequencies of 1MHz and 100kHz, and its severity level shall be Grade III specified in GB/T 14598. 13. * * Mode is 2.5kV, differential mode 1.0kV (differential mode of dedicated transceiver channel is 2.5kV). During the test and
2.8.2 Ability to withstand electrostatic discharge interference. The device shall be able to withstand the electrostatic discharge interference test with severity not lower than Grade III specified in GB/T 14598. 14, and the performance of the product during and after the test shall meet the requirements of this standard.
2.8.3 Ability to withstand radiated electromagnetic interference. The device shall be able to withstand the radiated electromagnetic field interference test with severity grade III specified in GB/T 14598.9, and the performance of the product during and after the test shall comply with the provisions of this standard.
2.8.4 Ability to withstand fast transient interference. The device shall be able to withstand the rapid transient interference test specified in GB/T 14598. 10, and the performance of the product during and after the test shall comply with the provisions of this standard.
2.8.5 Ability to withstand surge (lightning strike) interference. The device shall be able to withstand the surge (lightning strike) interference test specified in IEC60255-22-5, and the 24V open circuit shall be able to withstand the surge (lightning strike) interference test not less than level 2. The performance of the product during and after the test shall comply with the provisions of this standard.
2.8.6 Ability to withstand RF field induced conduction interference. The device shall be able to withstand the RF field induction anti-interference test, and its severity level shall not be lower than level III specified in IEC60255-22-6. The performance of the product during and after the test shall comply with the provisions of this standard.
2.8.7 Ability to withstand power frequency interference. The device shall be able to withstand the power frequency immunity test of severity A specified in IEC60255-22-7, and the performance of the product during and after the test shall comply with the provisions of this standard.
Electromagnetic emission test. The device shall meet the electromagnetic radiation limit specified in GB/T 14598. 16.
2.9 power consumption
A) power supply circuit: under rated working voltage, it is < 5w in normal operation and < < 4.5W in operation.
B) AC voltage loop: < 1VA/ phase (Un = 100V)
C) AC current loop: < 1VA/ phase (In = 5A)
< 0.5 volt/phase (In = 1A)
2. 10 weight
The total weight of the device does not exceed 2 kg.
Third, the device function description
3. 1 hardware conditions
The device includes three functional boards, namely I/O board, operation panel and main board.
3.2 Input/Output Board
I/O board has 8 switch input circuits, all inputs are connected to CPU and isolated by optical coupler; There are four switch isolated output circuits for driving the exit trip relay and alarm relay, and the output contact of each relay is normally open.
I/O has a working power input loop, and the AC220V or DC220V input outputs two sets of DC voltages required by the equipment through the power module: +5V (providing working power for CPU and its peripheral chips) and +24V (providing power for input and output loops). At the same time, the board also has a high-speed serial 485 communication interface for standby. One 4~20mA output is convenient to interface with DCS (optional).
3.3 operation panel
The panel includes 128×64 LCD screen, LED status indicator and touch button, which can conveniently realize the measurement, tracking and monitoring of operation, communication and protection status and LED indication.
3.4 motherboard
The CPU used in the motherboard is a high-speed 16-bit industrial control chip, which has the characteristics that the bus does not leave the chip. Off-chip extended logic (switch input/output, communication, etc. ) is connected with CPU through I/O line, which has strong anti-interference ability.
The hardware has two levels of watchdog to ensure that the system can be reset in time when it is abnormal; Serial E2PROM is used to save the fixed values and configuration to ensure that these parameters are not modified by mistake and can remain unchanged when power is cut off; The analog-to-digital conversion adopts 12 bit A/D of CPU, and the conversion rate is 200KPS. The system uses six analog channels for analog-to-digital conversion of external input. The input/output signals of the switch are subjected to photoelectric isolation and shaping; The CPU is connected with the I/O board and the operation panel through the I/O port.
3.5 Control function
3.5. 1 programmable logic control function
The device can realize rich programmable logic control functions. The device has five programmable input loops and one programmable output loop. Users can input corresponding logic according to their own needs and realize corresponding output control.
3.5.2 Self-starting control function
Self-starting control mode 1:
When the running motor stops due to voltage loss or undervoltage, when the power supply is restored to the allowable self-starting voltage value, the product can realize different self-starting control functions according to the stop time interval: immediate self-starting, delayed self-starting and prohibited self-starting.
When the stop interval is within 0. 1S~0.5S, the device can be started immediately. 10S or more, the allowable self-starting voltage setting range is 75%UN~95%UN, and the delayed self-starting time setting range is 0. 1S~60S.
Self-starting control mode 2:
Regardless of the length of the parking interval, the device realizes the self-starting function according to the motor operation memorized before the power failure. When the power supply is restored to the allowable self-starting voltage value, if the motor is in the running state before power failure, the self-starting function is realized; On the contrary, the self-starting function is prohibited. The allowable self-starting voltage range is 75%UN~95%UN, and the delayed self-starting time range is 0S~60S.
3.5.3 Remote and local control functions
The device can realize the local operation of the motor through the buttons on the panel and the remote control of the motor through the communication bus.
3.6 protection function
6. 1 locked rotor protection
Due to various reasons (mechanical failure, excessive load and low voltage), the rotor is locked. The full-pressure locked-rotor motor has poor heat dissipation condition and large current, which is particularly easy to burn out, so the device is equipped with locked-rotor protection.
The logic diagram of locked-rotor protection is as follows:
ground protection
The device is equipped with single-phase grounding protection to ensure the sensitivity of protection when single-phase grounding occurs at the low-voltage motor end of high-current neutral grounding system. The zero sequence current is calculated by the device. When the calculated zero-sequence current is greater than the set value, the device acts.
overheating protection
Overheating protection can protect the motor from locked rotation, overload, phase loss and imbalance. The device establishes the heating model of the motor by mathematical method, and provides accurate overheating protection for the motor under various working conditions. Details are as follows:
According to the positive sequence current and negative sequence current, the equivalent current Ieq is calculated, and the total thermal effect current of positive sequence current and negative sequence current is obtained. The expression of IEq is as follows: Ieq2 = K 1 * I 1 2+6 * i22, and the running time/current curve of the motor is expressed by the following formula: t = τ 1/(IEQ2/IE2, where the equivalent current of ieq operation is I1. If it continues to overheat, it's time to quit. Ieq is the maximum phase current when the device judges that CT is disconnected.
under voltage protection
A under-voltage protection is arranged in the device. When the power supply voltage drops for a short time or recovers after a short interruption, the motors that need to be disconnected should be equipped with under-voltage protection to ensure the self-starting of important motors and motors that don't need self-starting.
3.6.5 Long Start-up Time Protection
When the current starts from zero (greater than the current value), it is judged that the motor enters the starting state. When the start-up time reaches the start-up delay, if the rated current is 1.2 >: Max(Iap, Ibp, Icp), it is judged that the motor enters the running state, otherwise it is judged that the start-up time is too long.
Negative sequence protection
Because the primary or secondary phase of the power supply transformer is disconnected, the three-phase power supply voltage is unbalanced, the three-phase current of the motor will be unbalanced, resulting in negative sequence current, and the motor will burn out after long-term unbalanced operation, so the negative sequence (unbalanced) protection is installed.
3.7 Monitoring function of the device
The motor physical quantities that can be collected and calculated by the device are as follows: UA, UB, UC, IA, IB, IC, I0, I 1, I2, etc. In order to monitor the operation of the motor. Through the communication bus, these quantities can be transmitted to the control center to realize the function of remote monitoring.
Four. Terminal diagram
Verb (abbreviation for verb) Installation and overall dimensions of equipment
Shape and installation dimensions of equipment:
Appearance and installation dimensions of current transformer:
Schematic diagram of intransitive verb wiring
Seven. Network system diagram
7. 1 Network structure diagram with ECS system:
7.2 Structure diagram of two sets of MCC systems
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