施耐德ATV28_connectiontodc_bus_en.doc

Starters and Speed Drives Activity概要：1。交流侧加电抗器，以平衡瞬间的充电电流。2所有变频器的交流侧最好同时合上，也可以先合大功率变频器再合小功率变频器3. 应先合直流侧，再合交流侧4. 直流侧加快熔以防短路事故扩大。5. 某一变频器交流失电时，必须停止工作（否则它会从DC母线上抽取负载电流，使其他变频器过载，最好不要禁止电源缺相保护）6.ALTIVAR ATV28Connections on DC bus (+/- terminal block)IntroductionThis note has the objective to explain what are the possibilities of use of the Speed Drive Altivar 28 +/- terminals and what are the precautions to take in these applications.CAUTION:This note IS NOT APPLICABLE to the Speed Drives size 1 to 3 Indeed if network minibreakings take place during the working, SCF faults are caused when the voltage reappears.These faults are revealed by the upstream current detection in the phases on the small ranges(size 1 to 3)This detection cannot be disabled and needs a modification of the product, either hard or software.1. PARALLEL CONNECTING OF SEVERAL SPEED DRIVES1.1. SubjectThe parallel connecting of several Speed Drive allows to limit the use of braking resistances on machines in which the different movements are not in the deceleration phase at the same time. So the braking energy of one of these movements is sent back in the common DC bus and absorbed by movements which are working in motor mode.- Possibility of connecting in parallel the Speed Drive from 0.37 to 15 kW.- To date there is not any restriction about how many Speed Drive it is possible to connect on the DC bus.- Some recommendations and precautions have to be taken in account and detailed below.1.2. Application examples- Metallurgy: multi-motors line machine- Hoisting: association of the translation, direction, and hoisting movement- Centrifuge: association of the rotation and extraction motors1.3. Utilization1.3.1 Balancing of the input currentsEvery Speed Drive should be connected to the same main supply.Inductances (catalogued inductances) should be installed upstream of each Speed Drive for the products from ATV28*U09M2 to D12M2, and from ATV28*U18N4 to D23N4 in order to balance the currents in the input rectifier bridges. Board indicating the line inductances values: INDUCTANCERef. =S=SPEED DRIVE Ref. =S= P(kW) sizeL Nom.(mH)to I nom.(A)VZ1-L004M010ATV28*U09M2 0.37 T110 / 4AVZ1-L007UM50ATV28*U18M2 0.75 T15 / 7AVZ1-L018UM20ATV28*U29M2 1,5 T22 / 18AVZ1-L018UM20ATV28*U41M2 2.2 T32 / 18AVW3A66503ATV28*U54M2 3 T3 2 / 16AVW3A66504ATV28*U72M2 4 T31 / 30AVW3A66504ATV28HU90M2 5.5 T41 / 30AVW3A66504ATV28HD12M2 7.5 T41 / 30AVW3A66501ATV28*U18N4 0,75 T210 / 4AVW3A66501ATV28*U29N4 1,5 T210 / 4AVW3A66502ATV28*U41N4 2.2 T34 / 10AVW3A66502ATV28*U54N4 3 T3 4 / 10AVW3A66502ATV28*U72N4 4 T34 / 10AVW3A66503ATV28HU90N4 5.5 T42 / 16AVW3A66503ATV28HD12N4 7.5 T42 / 16AVW3A66504ATV28HD16N4 11 T51 / 30AVW3A66504ATV28HD23N4 15 T51 / 30ARemark:The connection of the Speed Drives on the DC bus is made without a coupling inductance.1.3.2. Protection against the short-circuitsA protection is necessary so as to prevent an accidental short-circuit in one of the Speed Drives and the damage of one or several other Speed Drives. So a breaking power device (ultra-fast fuse or circuit breaker) has to be installed between the outputs (+/-) of the Speed Drive and the common DC bus. Only one fuse is sufficient, either in the + cable, or in the cable, between the Speed Drive and the DC bus. However a fuse-holder isolator will allow a total insulation between the Speed Drive and the DC bus. In this case place a neutral bar in the isolator.The fuses should be sized at the maximal peak intensity of the Speed Drive.REMINDERS:- When an alternative current fuse is used with direct current, the minimum breaking current is generally higher (from 6 to 10 times higher than the nominal current for instance).- The nominal breaking capacity is the maximal value of the short-circuit current presumed that the fuse can break without any external sign in normalized conditions.In the alternative or direct networks, the nominal breaking capacity of the fuses always has to be equal or superior to the maximal fault current presumed of installation (IP current which would circulate in the installation if the inserted fuse were replaced by a trivial impedance connection). Board indicating the type and range of the fuses according to the Speed Drive:Speed Drive part numberSpeed Drive powerFuse range (A)ATV28*U09M20.37KW 220V10ATV28*U18M20.75KW 220V30ATV28*U29M21.5KW 220V30ATV28*U41M22,2KW 220V30ATV28*U54M23KW 220V40ATV28*U72M24KW 220V50ATV28HU90M25,5KW 220V60ATV28HD12M27,5KW 220V80ATV28*U18N40.75KW 400V10ATV28*U29N41.5KW 400V20ATV28*U41N42,2KW 400V20ATV28*U54N43KW 400V30ATV28*U72N44KW 400V30ATV28HU90N45,5KW 400V40ATV28HD12N47,5KW 400V50ATV28HD16N411KW 400V60ATV28HD23N415KW 400V80Fuse range:The current in the DC bus is determined in the following conditions:- the direct voltage is limited to 25V above the network peak voltage.- braking power: 1,5 times the nominal power of the Speed Drive.- line voltage (Ur) : 220 V or 400V So:We will take: I fuse range 1,34 * I Max with the safety coefficients:- temperature coefficient: 0,92- connection coefficient: 0,9- application with 1 stop a day, coefficient: 0,9.Use of circuit breaker between the Speed Drive and the DC bus:The use of a circuit breaker is possible. However its direct breaking capacity should be provided for a voltage 850V (maximal voltage of the working DC bus).Reminder: in case the breaking capacity of a circuit breaker is inferior to the short-circuit where it is installed, it is possible to make an association installing fuses upstream the circuit breaker(s).1.3.3 Switching on General rules to follow:- Power supplies L1, L2, L3: To avoid every overcurrent during the closing:OBLIGATION TO CLOSE THE CONNECTIONS ON THE DC BUS (FUSE-HOLDER ISOLATOR OR CIRCUIT BREAKERS) BEFORE SWITCHING ON THE POWER SUPPLY L1, L2, L3. The Speed Drive has to be stopped if the alternative current supply is not present. Indeed the direct current could be provided by a smaller ranged Speed Drive and so imply its overload. (See 1.3.4 faults management). It is recommended to switch on simultaneously the power of each Speed Drive in order to prevent a rectifier bridge of a low power Speed Drive from supplying a Speed Drive of a higher power. It is possible with an appropriate sequence to switch on the high power Speed Drive(s) in order of priority, then to switch on the low power Speed Drive(s) in decreasing order (see diagram at 1.3.8).- Other connections:In case we would use the safety relays in the control circuits, check that the maximum current in the relays is not exceeded:I Max (relays R1) = 1.5 A / 250 V1.3.4. Fault management.- If several Speed Drives of different power have their DC bus interconnected, and if a Speed Drive of higher power does not have L1, L2, L3 alternative supply, it can be supplied by a lower power Speed Drive, what can imply the damage of it.So it is better to keep the phase loss fault enabled.In case the phase loss is disabled, it is sufficient to insert an auxiliary contact (of the line contactor) in series with the LI1 working order. In this case, use preferably fuses with firing hammer indicator and isolators with micro contact, and insert the micro contact in series with the control circuit of the contactor. This will avoid the contactor control if one of the fuses is destroyed. - Auto-adaptation of the ramp:When several Speed Drives have their DC bus interconnected, and when one of the Speed Drives s in the deceleration phase and reaches the auto-adaptation threshold of the deceleration ramp, the other Speed Drives have to wait for the end of this change to auto-adaptation before being allowed to accelerate. Indeed when the auto-adaptation threshold of the ramp is reached, the Speed Drive only considers being in the deceleration phase and does not allow a normal acceleration phase.- Faulty Speed Drive:A Speed Drive being faulty will display the concerned fault.In case of destruction of a power component, the line fuses connected to the DC bus will protect the installation.Concerning a matter of maintenance on a faulty Speed Drive, a contactor can be installed between the Speed Drive and the DC bus (or rather a fuse-holder isolator). It is imperative to close firstly the DC bus (with the bus voltage = 0V) and then the line contactor. Caution: DC current, use a contactor which is able to open a DC voltage, or opening at null current wit an appropriate sequence.1.3.5 ConnectionsMaximal length of the DC bus between the Speed Drives: To date there is not any restriction concerning the maximal length of the DC bus between the Speed Drives. Tests with 25 meters did not show abnormal working of the Speed Drive.(Behaviour in case of short-circuit: in the process of being analysed, waiting for the answer of Ferraz).Use of bars for the DC bus:It is possible to assemble the fuses directly on bars (PROTISTOR fuses PSC series, FERRAZ).1.3.6. Braking.- Possibility to connect on each Speed Drive the braking resistance defined for each range.1.3.7. Principle diagramLine inductanceFuseBraking resistance1.3.8 Sequence examplePower diagram With power Start/Stop common.With P VAR1 P VAR2 = P VAR3 P VAR4F = fuse with firing hammer.L = line inductance. (See directory).With power Start/Stop separate.2. SUPPLY ONLY BY THE DC BUS WITH THE HELP OF AN EXTERNAL DC SOURCE.2.1. SubjectSupply of a group of Speed Drives connected in parallel by an only DC source, what allows the simultaneous supply of Speed Drives and allows to avoid the use of the line inductances on each of them.If the DC voltage is in fact a not filtered voltage (bridge with thyristors without a filtering capa) it is advisable to:-add inductances in the DC bus to limit the current in the power capacitors in working mode- program the source in order to generate a voltage ramp at the starting to limit the loading current of the power capacitors or to use a module to limit the current of the capacitors (type of loading resistance with shunt relays + detection system of the capa or tempo voltage value).If the voltage is a real DC source (rectifier bridge or thyristor bridge + capa) it is advisable to program the source in order to generate a voltage ramp at the starting to limit the loading current of the power capacitors or to use a module to limit this loading current (type: loading resistance with shunt relays + detection system of the capa or tempo voltage value).2.2. Application example- Metallurgy: multi-motors line machine2.3. Utilization2.3.1 Working voltage of the DC bus.DC supply voltage is from 480 to 770V:2.3.2. Supply currentThe following board precises the current limits of the different pattern of the ATV28 range:- Nom Idc :nominal direct current useful for a perfect DC supply- Max. Idc: maximal direct current useful for a perfect DC supply- Fuse range:Determined for the maximal current (Idcmax) multiplied by a safety coefficient of 1,34.SPEED DRIVERef. =S=Power(kW)nom I DC (A)max. I DC (A)mini protection range (A)ATV28*U09M20.37KW/220V3410ATV28*U18M20.75KW/220V5730ATV28*U29M21.5KW/220V101330ATV28*U41M22,2KW/220V141930ATV28*U54M23KW/220V172340ATV28*U72M24KW/220V233150ATV28*U90M25,5KW/220V304160ATV28*D12M27,5KW/220V385280ATV28*U18N40.75KW/400V3410ATV28*U29N41.5KW/400V5720ATV28*U41N42,2KW/400V71020ATV28*U54N43KW/400V101330ATV28*U72N44KW/400V131830ATV28*U90N45,5KW/400V162240ATV28*D12N47,5KW/400V223050ATV28*D16N411KW/400V304160ATV28*D23N415KW/400V4155802.3.3 Possible different sourcesCase of a pure DC source (example battery, rectifier with bank of capacitor, etc ).An external device for the precharge of the filtering capacitors has to be forecast. This device is composed of a loading resistance, a contactor to shunt the resistance and a device to close the contactor when the charge is finished or after a time delay. Moreover the working of the product has to be forbidden as long a