Basic wiring of the hottest motor VMX series

2022-08-20
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The basic wiring of motor VMX series

the basic wiring is often referred to as "wiring". The wiring of the soft starter is divided into two parts: the wiring of the main circuit and the wiring of the control circuit

(I) wiring of the main circuit

vmx series soft starters have many specifications, but no matter what, the wiring terminal of the main circuit is facing down. The power input terminals are L1, L2, L3 (or R, s, t), and the soft starter output terminals are T1, T2, T3 (or V, u, w). Figures ~ show the appearance of several specifications of soft starters and the wiring terminals of the main circuit

1. Power wiring

connect the appropriate power supply to the input end of VMX series soft starter marked with L1, L2, L3 (IEC standards are R, s, t). Note that the power line should not be close to the main control board, and connect the motor to the XLD load end marked with T1, T2, T3. The length, specification and torque of the wire should refer to NEC standard (National Electrical Code of America). If the main power supply is not provided to L1, L2, L3 after the control power supply is connected, The screen will display [n3ph]

note: never connect the input and output connectors of VMX reversely, otherwise excessive voltage will be generated in the logic circuit of the controller and the control circuit will be seriously damaged

(1) bypass contactor. The bypass contactor has been installed on the soft starter chassis in vmx-bp and vmx-e series. For details of contactor control and overload protection, please refer to the content introduced later

(2) power factor compensation capacitor. The power factor compensation capacitor can control the time of connecting to the motor end through VMX, and the compensation capacitor must be disconnected from the circuit when starting. The compensation capacitor should be connected to the incoming line side of the soft starter through an independent contactor

warning: do not connect the power factor correction capacitor on the output end (load end) of VMX, otherwise the thyristor will be seriously damaged

figure vmx-18 ~ vmx-48 shape and main circuit terminal

figure vmx-62 ~ vmx-112 shape and main circuit terminal

figure vmx-150 ~ vmx-160 shape and main circuit terminal

(3) grounding. The grounding wire is connected to the place with grounding mark on the soft starter. The selection of grounding wire shall be in accordance with NEC or local electrical standards, and the grounding wire shall be well grounded. In ungrounded systems, soft starter grounding is not required. However, local electrical standards in the fields of diplomacy, economy and trade, transit transportation, mining, infrastructure construction, finance, culture, housing construction and other fields can be referred to

Ⅷ x-210-p to Ⅷ x-550-p

figure vmx-210-p to vmx-550-p shape and main circuit terminal

2 Test

vmx series soft starter can be tested by a small motor. Using this technology and equipment, the low current test needs to cancel the phase failure when doing the test

note: when the VMX series soft starter is tested for small current, the output end of the soft starter must be connected to the motor or other loads. When no load is connected to VMX, there will be voltage at the output of the device

3. Lightning protection

as an electronic controller, a desktop spark gap arrester must be installed at the power input end of the soft starter in areas where lightning often strikes. The lightning arrester should be connected to the input side of the soft starter through the isolation contactor. When the soft starter is not working, the lightning arrester can be disconnected through the isolation contactor

(II) wiring of control circuit

the control wiring of VMX series soft starter is divided into two parts. Tb1 is the DC terminal block with 12 terminals (on the left), and TB2 is the AC terminal block with 10 terminals (on the right). These pluggable terminal blocks are easy to connect or maintain. See the following instructions for specific wiring

note: the terminal number is marked at the beginning and end of each terminal strip, and there are three terminals on the leftmost side as communication ports

1. The wiring of AC control power supply

vmx series soft starter requires independent AC control power supply. The factory standard control power supply is 240VAC, and other power supply voltages can be explained when ordering. The control voltage must be connected to A1 and A2 of TB2 (the terminal numbers can also be 21 and 22), as shown in the figure. The control voltage must be provided by the user

figure wiring of AC control power supply

when ordering, order the control transformer, and the control power supply can be provided through the soft starter

(1) control power requirements. Please refer to the values in the table for the capacity of the control power transformer of vmx-bp series soft starter. If other additional equipment needs to be powered by the control power transformer, the type selection of the transformer should add the power supply capacity of other equipment to ensure the correct action of the bypass contactor

note: vmx-210 and above models can operate continuously without bypass, but the cooling fan must be selected. If the cooling fan is to be selected in nema1 soft starter, the power capacity required by the fan should be considered when selecting the control transformer

(2) control fuse. When the terminal block of the output relay on TB2 is used, overcurrent protection must be considered, which cannot exceed 5A. Fuse or other suitable current protection devices can be used for protection. Tb1 is the fault output terminal, and the user can use it as the input signal of PLC or relay control circuit. The capacity of solid-state relay is 50mA, 10 ~ 250V ac/dc, and corresponding fuse is required for connection

figure three wire control wiring method

2 The wiring mode of three wire control

as the standard three wire control mode, connect the passive start/stop control buttons according to the way shown in the figure. The starting signal is the dynamic make contact connected to #1 terminal block (the leftmost terminal), the common point is connected to #2 terminal (the second terminal on the left), and the stop signal is the dynamic break contact connected to #3 terminal (the third terminal on the left). VMX series soft starter has a self holding contact in the start button. After the start command is issued, there is no need for external auxiliary contact, and the self holding signal is generated through its own contact. As shown in the figure

3. Two wire control mode

connect a self holding contact on #1 and #3 terminals. When the contact is closed, the soft starter starts, and when the contact is disconnected, the soft starter stops. As shown in the figure

if the clock function (f032-f039) or automatic reset function (f052-f053) is used, the two-wire control mode must be specially designed to achieve the purpose of safe operation of the equipment through external interlocking

note: the user uses a self holding contact as the start/stop signal, and the overload level can be set according to the requirements in the manual. This can prevent the motor from starting automatically after the overload trip is reset automatically

the control terminal tb1 is powered by the internal 24V DC power supply of VMX, so the external connection terminal connected with tb1 must be passive, otherwise it will cause serious damage to the control board of VMX series soft starter

figure two-wire control wiring method

if the external wiring circuit with 220V AC or other voltage levels is provided, the VMX series soft starter must be controlled through intermediate relay conversion or two-wire control mode

figure interlocking wiring diagram

4 Interlocking wiring

tb1 terminals 4 and 5 are external interlocking terminals (for dynamic disconnection interlocking), which are short circuited through external wiring when leaving the factory. If the user wants to connect the external interlocking signals (such as low oil level, high temperature, and large equipment vibration) to the control part, he can remove the factory wiring of 4 and 5 and then connect it to 4 and 5 of tb1. The soft starter cannot work after 4 and 5 are disconnected. As shown in the figure

5. Setting of double slope and inching

external signals are connected to the relevant terminals of tb1 to control the double slope and inching function effectively. Of course, double slopes or inching can be set separately or at the same time

(1) dual slope control. Close 6 and 7 of tb1 through external dry contacts to make slope 2 effective. VMX series soft starter will start the motor according to the set parameters of f015-f018. If 6 and 7 of tb1 are not closed, the starting mode of slope 1 is defaulted during starting, and the relevant parameters are set in f011-f014. When the motor starts, the load changes very obviously, so you can choose the double slope starting mode. For example, the belt conveyor may start with light load or heavy load. In order to ensure the optimal starting characteristics under various conditions, so as to reduce the starting current on the premise of meeting the starting requirements, the user can use the starting mode of slope 1 under light load and slope 2 under heavy load. Ramp 2 can directly start the motor at full voltage by setting the starting time as 0s and the starting current as 600%. As shown in the figure

double ramp mode can also be used as the starting mode of two speed motor. The wiring mode can be used as the selection signal of ramp 2 through the auxiliary contact of either of the two contactors, so the two starting modes can be set independently according to the requirements of users

(2) inching control. Close 7 and 8 of tb1 through external dry contacts to make the inching mode effective. After the starting command is issued, the soft starter starts inching the motor. The typical applications of jog mode are the positioning of machine tools, the micro motion of motors or the operation detection of belt conveyors

figure slope control

when the user needs to jog, slope 2 also works at the same time. You can short circuit 6 and 8 of tb1, and connect 7 (24V DC) of tb1 to 6 and 8 through a contact. As shown in the figure

figure running one jog control

figure double slope and jog control

(3) double slope and jog function work at the same time. As shown in the figure

c (positive temperature coefficient thermistor) input

figure wiring diagram of PTC resistor

VMX series soft starter provides input contact for motor PTC temperature detection. The thermal resistance is embedded in the motor winding. When the motor temperature rises, the resistance temperature also increases. VMX judges the motor temperature by detecting the resistance value of the thermal resistance. When the temperature is too high, the soft starter will send pic tripping command and display [ptc] at the same time. When leaving the factory, 9 and 10 of tb1 are short circuited through external wires. If users need PTC protection, they can connect the lead of PTC thermal resistor to 9 and 10 of tb1 and remove the factory wires at the same time. As shown in the figure

of course, PTC resistance can detect the temperature of other equipment that affects the operation of the motor as the conditions for operation and stop, such as bearing temperature, ambient temperature, oil temperature, radiator temperature, etc

when the resistance value of thermal resistance is 25 ℃, it must be greater than or equal to 750 Ω. If the motor is equipped with many thermal resistors, the resistance sum of these thermal resistors must also be greater than or equal to this value

7. Wiring mode of external overload relay

if the user selects the external overload relay as the overload protection device of the motor, the normally closed auxiliary contact of the overload relay can be connected to the input terminal of PTC (the factory short wiring needs to be removed to improve the safety and environmental protection performance of plastic packaging). When the external overload relay trips, the contact connected to the PTC input terminal is disconnected, and the soft starter will trip and display as [ptc] fault, so the external overload trip display is different from the internal trip display. If several overload relays are used externally for overload protection of several motors at the same time, the dynamic breaking auxiliary contact of the overload relay can be connected in series to the input terminal of PTC. See "external overload relay of VMX series soft starter" in this section for other details. As shown in the figure

figure wiring diagram of external overload relay

note: emergency stop button or other similar devices can connect its dynamic breaking contact to the input terminal of PTC. When the contact is disconnected, PTC tripping fault is displayed. If the PTC terminal of the user has been used, the normally closed contact requiring the signal can be used in series with other contacts, but the total resistance value of the circuit must be input in PTC

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