SCR3200系列恒功率中频电源控制板中英文说明

ＳＣＲ3200系列恒功率中频电源控制板中英文说明
ＳＣＲ3200系列中频电源控制板是最新推出的结合787和785电路高度集成化和恒功率控制的优点而生产的最新一代产品,控制板上带整流和逆变脉冲压器。

SCR3200Series intermediate frequency power supply control panel
is the newest one.And it unite the excellence of high integration and permanent power control of787&785circuit.The control panel has commutate and inverter pulse.
1．控制电路原理The elements of control circuit
整个控制电路除末级电路部分外，做成一块印刷电路板结构，从功能上分为整流触发部分、调节器部分、逆变部分、启动演示部分。

详细电路见
《SCR3200中频电源控制板电路原理图》。

Whole control circuit(except the last stage circuit part),can make into a piece of PCB construction.It can classify by the function:commutate spring part,adjustor part,inverter part,
start-up operate part.Please see the detail circuit as<Elements drawing of SCR3200>.
1.1控制板接线说明：The elucidation of connection
控制板采用两组１５－１７Ｖ交流电源，分别接于１８VAC接线端子上。

Ａ、Ｂ、Ｃ分别为Ａ相同步，Ｂ相同步，Ｃ相同步接线，分别直接接于三相工频电上。

The control panel has2groups AC power supply of15-17V.Each of them is connect with the18VAC terminal separate.The meaning of A、B、C:A phase synchronous,B phase synchronous,B phase synchronous connection.
27、GND为过流，过压保护的继电器输出端，可设计成声、光及其它方式的
报警系统。

当设备主电路发生过压、过流后，整流桥被拉到逆变区的同时，过流、过压继电器动作，点亮面板上的指示灯，在此同时板子上过压、过流工作指示灯变亮。

27、GND is the fan-out of the over current,over voltage
protection relay,can design the alarm system of voice,light and other methods.When the main electric circuit in equipments takes place to over current&over voltage,commutate bridge will be
pulled to the inverter area.Over current,over voltage relay will has the action.The indicator light of the control panel will light. And at the same time,the over current&over voltage indicator
light on the control panel will light.
Ｘ２１、Ｇ６，Ｘ１１、Ｇ４，Ｘ３１、Ｇ２为整流桥共阳极组ＳＣＲ６、ＳＣＲ４、ＳＣＲ２三只可控硅触发脉冲的输出端，分别与相应的可控硅的控制极和阴极相接。

Ｘ21,Ｇ6,Ｘ11,Ｇ4,Ｘ31,Ｇ2are the fan-out of the commutate bridge anode groupsＳＣＲ6,ＳＣＲ4,ＳＣＲ 2.Each of them is connect with the control pole and cathode.
Ｇ５、１，Ｇ３、１，Ｇ１、１分别为整流桥共阴极组ＳＣＲ５、ＳＣＲ３、ＳＣＲ１三只可控硅触发脉冲输出端，分别与相应的可控硅的控制极和阴极相接。

Ｇ５、１，Ｇ３、１，Ｇ１、１are the fan-out of the commutate bridge anode groupsＳＣＲ５、ＳＣＲ３、ＳＣＲ１.Each of them is connect with the control pole and cathode.
３３、３４、３５为逆变启动和停止控制输入端，其外接线路如下图２所示：（图中指示灯为发光二极管）
３３、３４、３５is the input of the inverter start-up&stop control.See the outside connection as Drawing2.(The indicator light is LED.)
（图２）(Drawing2)
Ｋ１、Ｋ２、Ｋ３为三相工频交流互感器输入端，通过进线端的５００/５Ａ的互感器，再通过５/０．１Ａ的电流互感器二次转换后，星形接于三个接线端子上。

作为过流检测和电流闭环调节的输入信号。

Ｋ1,Ｋ2,Ｋ3are the input of the AC three phase transformer, after the double transform of passing into enter terminal of
500/5A transformer&passing5/0.1A current transformer,they will connect with3terminal and like the star shape.As the input signal of over current check&current close loop adjust.
０５４、０５５为中频反馈电压输入端，通过1000/15V的中频变压器转变成合适的电压信号输入，作为过压检测和电压闭环调节的输入信号。

054、055are the input of intermediate frequency feed back voltage. After passing1000/15V intermediate frequency transformer,will be transformed to the suitable voltage signal.As the input signal of over voltage check&voltage close loop adjust.
０７３、０７４、０７５为功率给定调节电位器输入端，０７５端接于功率调节电位器的右端点，０７４接于中间接点，０７３接于左端点，使功率调节的方向为顺时针功率增大，逆时针功率减小。

073,074and075are the input of the power regulator,075is connect with the right end of the power adjuster,074is connect with the middle one,and the073is connect with the left one.So that the direction of the power regulate will be clockwise power augment,counter-clockwise power minish.
Ｇ７、７，Ｇ８、８，Ｇ９、９，Ｇ１０、１０，Ｇ１１、１１，Ｇ１２、１２，Ｇ１３、１３，Ｇ１４、１４为逆变可控硅触发脉冲输出端，分别接于相应可控硅的控制极和阴极上，其中Ｇ７、Ｇ８、Ｇ９、Ｇ１０为逆变桥的一组对角上的可控硅的控制极输入端，Ｇ１１、Ｇ１２、Ｇ１３、Ｇ１４为另一组对角的可控硅的控制极输入端。

Ｇ７、７，Ｇ８、８，Ｇ９、９，Ｇ１０、１０，Ｇ１１、１１，Ｇ１２、１２，Ｇ１３、１３，Ｇ１４、１４are the output of the inverter control silicon spring pulse.Each of them is connect with the control pole and cathode.
１８２(-)、１８３(+)为外接频率表负极与正极的输出接线端。

１８２(-)、１８３(+)are output terminal of the frequency table.
1.2调整电位器说明：The elucidation of regulator
将控制板安装于柜子上，使逆变变压器向下方，按此位置固定的各电位器功能如下：上端三个电位器Ｗ７、Ｗ８、Ｗ９为Ａ、Ｂ、Ｃ三相同步信号调节电位器，用户一般不需调整。

电位器Ｗ６为移相嵌位电压调节电位器，调节此电位器可改变移相电压的起始电位，应使其满足：当功率调节电位器反时针旋到底时，整流主回路应无输出，但触发脉冲应有输出。

最右端的电位器Ｗ５为频率表的校正电位器，旋动此电位器，频率表指示可发生变化。

左下方四个电位器从左到右依次为Ｗ４限压、Ｗ３过压和Ｗ２过流、Ｗ１限流调整电位器，该电位器为多圈精密电位器，顺时针旋转为整定值减小，逆时针旋转为整定值增大。

The control panel is installed in the cabinet,making the inverter transformer to get down.See the function as follows:The top adjustＷ７、Ｗ８、Ｗ９areＡ、Ｂ、Ｃ3phase synchronous regulator, don’t need to regulate.Ｗ6is the move-phase inbuilt voltage regulator,it can change the start station of move-phase voltage if
regulating W6.But should make its contented:When the power regulates revolve by counter-clockwise,commutate main loop must has no output,but the spring pulse has the loop.The most right machineＷ5is the proofread one of the frequency table.If we revolve it,the frequency table induction may change.Lower left four machine isＷ4limited voltage,Ｗ3over voltage andＷ2over current,Ｗ1limited current regulator.The setting value will minish if clockwise revolve,and the setting value will augment if counter-clockwise revolve.
1．3调节器工作原理Operate elements of regulator
调节器部分共设有四个调节器：中频电压调节器、电流调节器、阻抗调节器、逆变角调节器。

The regulator has4parts:intermediate frequency voltage regulator, current regulator,impedance regulator,inverter regulator,
其中电压调节器、电流调节器，组成常规的电流、电压双闭环系统，在启动和运行的整个阶段，电流环始终参与工作，而电压环仅工作于运行阶段；另一阻抗调节器，从输入上看，它与电流调节器LT2的输入完全是并联的关系，区别仅在于阻抗调节器的负反馈系数较电流调节器的略大，再者就是电流调节器的输出控制的是整流桥的输出直流电压，而阻抗调节器的输出控制的是中频电压与直流电压的比例关系，即功率因数角。

Among them,the voltage regulator and current regulator are buildup general current&voltage double close loop system.During the moment of start-up and operate,the current will always working, but the voltage will only keep in the running status;
调节器电路的工作过程可以分为两种情况：一种是在直流电压没有达到最大值的时候，由于阻抗调节器的反馈系数略大，阻抗调节器的给定小于反馈，阻抗调节器便工作于限幅状态，对应的为最小逆变角，此时可以认为阻抗调节器不起作用，系统完全是一个标准的电压、电流双闭环系统；另一种情况
是直流电压已经达到最大值，电流调节器开始限幅，不再起作用，电压调节器的输出增加，而反馈电流却不变化，对阻抗调节器来说，当反馈电流信号比给定电流略小时，阻抗调节器便输出限幅，开始工作，调节逆变角调节器的θ角给定值，使输出的中频电压增加，直流电流也随之增加，达到新的平衡。

此时，就只有电压调节器与阻抗调节器工作，若负载等效电阻Rh继续增大，逆变θ角亦相应增大，直至最大逆变θ角。

The working process of the regulator circuit has2different status: One is when the DC voltage hasn’t reached up the Max.The system
only is a standard voltage&current double close loop system.The other is when the DC voltage has reached up the Max.there will
only the voltage regulator and impedance be working,if the load equivalent resistor Rh keep on augment,the inverterθangle will also augment,till Max.
逆变角调节器用于使逆变桥能在某一θ角下稳定的工作。

中频电压互感器过来的中频电压信号054和055输入后，分为两路，一路送到部分，另一路经D7－D10整流后，又分为三路，一路送到电压调节器；一路送到过电压保护；一路用于电压闭环自动投入。

After input intermediate frequency voltage signal054and055from intermediate frequency voltage transformer,they will in two loads, along them,one load will pass the D7－D10commutate,then in tree load,one will get to the voltage regulator,another will get to over load voltage protection,the last one will used for voltage close loop.
电压PI调节器由IC7A组成，其输出信号由IC7D进行钳位限幅。

IC7C和
IC6C组成电压闭环自动投入电路，DIP－3开关用于电压开环调试。

内环采用了电流PI调节器进行电流自动调节，控制精度在1%以上，由主回路交流互
感器取得的电流信号，从K1、K2、K3输入，经二极管三相整流桥整流后，再分为三路。

一路作为电流保护信号，另一路作为电流调节器的反馈信号，还有一路作为阻抗调节器的反馈信号。

由IC6B构成电流PI调节器，然后由
IC6A隔离，控制触发电路的电压－频率转换器。

Voltage PI regulator is compose with IC7A,the output signal is limited by IC7D.IC7C and IC6C compose the voltage close loop auto circuit,DIP－3type switch is used for voltage open loop regulate.
Inner loop adopt the current auto regulate by current PI regulator, the controlling accuracy is≥1%.The current signal is input from K1、K2、K3,after the commute of diode3phase commutate bridge,it will in tree load.One will to be current protection,another will to be feed back signal of current regulator,the last one will to be the feed back signal of the impedance regulator.
IC6C构成阻抗调节器，它与电流调节器是并列的关系，用于控制逆变桥的引前角。

其作用可间接地达到恒功率输出，或者可提高整流桥的输入功率因数。

DIP－1可关掉此调节器。

IC8B构成逆变角调节器，其输出由IC8C为其钳位限幅。

Impedance is composed with IC6C,IC6C and current regulator is paratactic.IC6C is used for controlling inverter bridge.It can achieve the permanent frequency output,or improve the input power factor of commutate.DIP－1can turn off the regulator.
Inverter angle regulator composed with IC8B,and it’s output is limited by IC8C.
1．4逆变部分工作原理The working elements of inverter part
本电路逆变触发部分，采用的是扫频式零压软起动，由于自动调频的需要，虽然逆变电路采用的是自励工作方式.，控制信号也是取自负载端，但是主回路上无需附加的起动电路，不需要预充磁或预充电的起动过程，因此，主回路得以简化，但随之带来的问题是控制电路较为复杂。

The inverter spring part of this circuit adopt the zero-voltage
soft start-up.As the require of the auto frequency modulation,the main loop don’t need to additive start-up circuit.
起动过程大致是这样的，在逆变电路起动前，先以一个高于槽路谐振频率的它激信号去触发逆变晶闸管，当电路检测到主回路直流电流时，便控制它激信号的频率从高到低扫描，当它激信号频率下降到接近槽路谐振频率附近时，中频电压便建立起来，并反馈到自动调频电路。

自动调频电路一旦投入工作，便停止它激信号的频率扫描，转由自动调频电路控制逆变引前角，使设备进入稳态运行。

See the start-up process as follow:before the start-up of inverter circuit,there will be a high frequency signal to spring the inverter tube.When the circuit check the main loop DC current, it will control the frequency signal to scan from high to low,when the signal fall down to the syntony frequency,the intermediate frequency will build up,and feed back to the auto frequency modulation circuit.Once the auto frequency modulation circuit begins working,it will stop the frequency scan,then control inverter angle.So that the equipment will steady operate.
若一次起动不成功，即自动调频电路没有抓住中频电压反馈信号，此
时它激信号便会一直扫描到最低频率，重复起动电路一旦检测到它激信号进入到最低频段，便进行一次再起动，把它激信号再推到最高频率，重新扫描一次，直至起动成功，重复起动的周期约为0.5秒钟，完成一次起动到满功率运行的时间不超过一秒钟。

If the first time of start-up is not successful,the reason
is auto frequency modulation circuit hasn’t held the feed back
signal of the intermediate frequency.Meanwhile,the signal will always scan the lowest frequency and restart the circuit.Once they find the signal has come into the lowest frequency,it will restart, and scan again,till success.The cycle of restart is0.5second, the time of finishing one time start-up and full power operating
will less than1second.
由054和055输入的中频电压信号，经变压器隔离送到中频起动模
块，中频起动模块输出的信号经微分后变成窄脉冲输出，驱动逆变未级MOS
晶体管。

IC8D为启动失败检测器，其输出控制重复起动电路，IC8A为启动成功检测器，其输出控制中频电压调节器的输出限幅电平和主回路直流电流。

W6为逆变它激信号的最高频率设定电位器。

The intermediate frequency voltage signal what is input from 054and055,will be sent to intermediate frequency start-up module after the separating of the transformer.The output signal of intermediate frequency start-up module will become the narrow pulse, driving the inverter MOS transistor.
1．5启动演算工作原理The working elements of start-up figure
过电流保护信号经IC7B倒相后，送到IC5A组成的过电流截止触发
器，封锁触发脉冲(或拉逆变)；驱动“过流”指示灯亮和驱动报警继电器。

过电流触发器动作后；只有通过复位信号或通过关机后再开机进行“上电复位”，方可再次运行。

通过W2微调电位器可整定过流电平。

After the inverse phase of IC7B,over current protection
signal will reach to the over current cut-off trigger(compose with IC5A),blanking off the spring pulse.Driving the“over current”indicator light turning on and also driving the alarm relay.After the act of over current trigger,the“electrify reset”only have to pass the reset signal or turn-off the machine then turn on.
自动重复启动电路由IC9A组成。

DIP－2开关用于关闭自动重复启动电路。

The auto repeating start-up circuit is composed with IC9A,
The DIP-2switch is used for turn-off the auto repeating start-up circuit.
IC5B组成过电压截止触发器，封锁整流桥触发脉冲(或拉逆变)；驱动“电压”指示灯亮和驱动报警继电器。

过电压触发器动作后，也象过电流触发器一样，只有通过复位信号或通过关机后再开机进行“上电复位”，方可再次运行。

通过W1微调电位器可整定过压电平。

复位开关信号由075、复位输入，闭合状态为复位暂停。

The over voltage cut-off trigger is compose with IC5B, blanking off the spring pulse.Driving the“over voltage”indicator light turning on and also driving the alarm relay.After the act of over voltage trigger,the“electrify reset”only have to pass the reset signal or turn-off the machine then turn on.The W1can setting the over voltage.
Replacement switch signal is repeat input by075,the close loop status is replacement stay.
2．调试Regulate
2．1整流部分的调试The regulate of commutate part
调试前，应该使逆变桥不工作。

例如：把平波电抗器的一端断开或断开逆变末级输入线，使逆变桥的晶闸管无触发脉冲。

再在整流桥口接一个1－2KW的电阻性负载。

电路板上的If微调电位器W2顺时针旋至灵敏最高端，在调试过程发生短路时，可以提供过流保护，主控板上的开关均拨在ON 位置，用示波器作好测量整流桥输出电流电压波形的准备，把面板上的“给定”电位器逆时针旋至最小。

Before regulate,the inverter bridge can be working status. For example:
送上三相供电(可以不分相序)，检查是否有缺相报警指示，若有，可以检查进线快速熔断器是否损坏。

Sending3phase power supply(can have no gradation),check
it and confirm if they have the lost-phase alarm indication.If have,we can check if the fuse is trouble.
把面板上的“给定”电位器顺时针旋大，直流电压波形应该几乎全放开，再把面板上的“给定”电位器逆时针旋至最小，调节整流板上的W4微调电位器，使直流电压波形全关闭，移相角约120度。

输出直流波形在整个移相范围内应该是连续平滑的。

把逆变桥接入，使逆变触发脉冲投入。

把电路板上的Vf微调电位器W1顺时针旋至灵敏最高端，(调试过程发生过压时，可以提供过压保护)。

把面板上的“给定”电位器顺时针稍微旋大，这时逆变桥便工作。

当出现直通现象时，继续把面板上的“给定”电位器顺时针旋至一半，此时直流电流表指示到额定电流的25%左右，若电流表的指示不为额定值的25%，可调节整流板上的W2电流反馈微调电位器，使直流电流表指示到额定输出电流的25%左右。

一旦逆变起振后，直流电流就可接近额定电流值，精确的额定电流整定，要在满负荷运行时才可进行。

Connecting the inverter bridge,in order to jump in the inverter spring pulse.Cycle W1to the Max.by clockwise,(if the over voltage is happen in regulating,can supply the over voltage protection).When cycle the“given”a little by clockwise,the inverter bridge will work.Cycle a half by clockwise,the DC ammeter will indicate25%of rated current,if hasn’t get to25%, we also can regulate W2.The accuracy rated current setting,must process after the full charge running.
若把面板上的“给定”电位器顺时针稍微旋大，逆变器便起振，不出现直通现象，可调节中频电压互感器的相位，即把中频电压互感器20V绕组的输出线调一下，就不会起振了。

这样整流桥的调试就基本完成，可以进行逆变桥的调试。

If don’t appear passing directly after cycle the“given”a little bigger,you can regulate the phase of the intermediate frequency voltage transformer.
After finish the regulate of commutate bridge,we can do the regulate of inverter bridge.
2．2逆变部分的调试Regulate of inverter part
2．2．1首先应校准频率表。

用示波器测逆变触发脉冲的它激频率(它激频率可以通过W6来调节)，调节W7微调电位器，使频率表的读数与示波器测得的相一致。

2．2．1At first,we need to adjust the frequency table. Measure the inverter spring pulse frequency by oscillograph(the frequency can be regulated by W6).If regulate W7,can make the reading of frequency table same as the oscillograph’s.
2．2．2起振逆变器。

调节控制板上的W6微调电位器，使其略高于槽路的谐振频率，W3、W5微调电位器旋在中间位置。

把面板上的“给定”电位器顺时针稍微旋大，这时它激频率开始扫描，逆变桥便进入工作状态，当起动成功后，控制板上“P.P”指示灯会熄灭。

可以把面板上的“给定”电位器旋大、旋小反复操作，这样，它激信号也反复作扫频动作。

若不起振，可调节中频电压互感器的相位，即把中频电压互感器20V绕组的输出线对调一下。

此步骤的调试，亦可使DIP－2和DIP－3开关处在OFF位置，此时加入了重复起动功能，电压环也投入工作。

2．2．2Oscillate the inverter.Regulate W6to make it little higher than syntony frequency,cycle the W3、W5to the middle station.Cycle the“given”a little bigger by clockwise,the frequency will begin to scan,the inverter bridge will work.When the start-up success,“P.P”light on the panel will turn-off.You can cycle the“given”repeating,and the frequency also will scan repeating.If it don’t oscillate,you can regulate the phase of the intermediate frequency voltage transformer.The regulation of this process,can make the DIP－2and DIP－3switch stay in OFF,if you add the restart-up function now,the voltage loop will begin to work.
2．2．3逆变起振后，可做整定逆变引前角的工作，把DIP－1开关打在OFF位置，调节W5微调电位器，使中频输出电压与直流电压的比为1.2左右(若换相重叠角较大，可适当增大此比例值)；再把DIP－1开关打在ON位置，调节W3微调电位器，使中频输出电压与直流电压的比为1.5左右或更高)，此项调试工作可在较低的中频输出电压下进行。

注意：先调1.2倍关系，再调1.5倍关系，否则顺序反了，会出现互相牵扯的问题。

2．2．3After the inverter oscillate,can deal with the setting inverter angle.Turn the DIP－1switch OFF,regulate W5,to make the intermediate frequency output voltage is1.2times than DC
voltage;Turn the DIP－1switch ON,regulate W3,to make the intermediate frequency output voltage is 1.5times or more than DC voltage.This regulation can be happen in the lower intermediate frequency output voltage.Attention:1.2will be first regulated, and the 1.5will be later.Otherwise,there will meet trouble.
2．2．4下一步可以在轻负荷的情况下整定电压外环。

主控板上的DIP －3开关拨至OFF位置，W1微调电位器均顺时针旋至最大，把面板上的“给定”电位器顺时针旋大，逆变桥工作。

继续把面板上的“给定”电位器顺时针旋至最大，逆时针调节W1微调电位器，使输出的中频电压达到额定值。

在这项调试中，可见到阻抗调节器起作用的现象，即直流电压不再上升，而中频输出电压却还能继续随“给定”电位器的旋大而上升。

2．2．4Next you can setting the voltage outer loop under the light load.Turn the DIP－3switch OFF,regulate W3to Max.by clockwise,cycle the“given”more bigger,the inverter bridge will work.Continue to cycle the“given”to Max.by clockwise,regulate W1by counter-clockwise,to make the rated output intermadiate frequency voltage.In the regulation of this process,the DC voltage will stop rising,and the output voltage may can’t rising.
2．3过压保护
控制电路上已经把过压保护电平固定在额定输出电压的1.2倍上，当进行额定电压整定时，过压保护就自动整定好了。

若觉得1.2倍不合适，可改变控制板上的R13电阻值，增大R13，过压保护电平增高；反之减小。

2．3Over voltage protection
The over voltage protection has been keep in the 1.2times than rated voltage on the control circuit.When you make the
setting of the rated voltage,the over voltage protection has been auto set.If the1.2is not suitable,please change the valve of R13on the control panel,increasing R13,the over voltage protection also will increase.
2．4过流保护
控制电路上已经把过流保护电平固定在额定直流电流的又1.5倍上，当进行额定电流的整定时，过流保护就自动整定好了。

若觉得1.5倍不合适，可改变控制板上的R43电阻值，增大R43，过流保护电平增高；反之减小。

2．4Over current protection
The over current protection has been keep in the 1.5times than rated current on the control circuit.When you make the setting of the rated current,the over current protection has been auto set.If the1.5is not suitable,please change the valve of R43on the control panel,increasing R43,the over current protection also will increase.
2．5额定电流整定
在满负荷下，调节控制板上的W2电流反馈微调电位器，使直流电流表达到额定值。

2．5Rated current setting
regulate W2on the panel to make the rated DC current ammeter under full load.
3．注意事项
3．1调试需准备的工具
一台20M的示波器，若示波器的电源线是三芯插头时，注意“地线”千万不能接，示波器外壳对地需绝缘，仅使用一踪探头。

示波器的X轴、Y 轴均需校准，探头需在测试信号下补偿好，若无高压示波器探头，应用电阻做一个分压器，以适应600V电压的测量。

一个≤5000、≥500W的电阻性负载。

3．Notice:
3．1The needed tool for regulation
A piece of20M oscillograph,if it has the3-pin plug,please notice that we can’t connect the“earthing”,the oscillograph must be insulated,only need to use a group probe.The X axes、Y axes must need to adjust,probe must ok by signal testing.If there is no high-voltage oscillograph probe,you need to make a voltage divider with resistor to adapt the testing of600V voltage.
One resistor load of≤5000、≥500W.
3．2整流部分调试中的问题
若在整流部分调试中，发现出不来6个整流波头，则应检查6只整流晶闸管的序号是否接对。

晶闸管的门级线是否接反或短路。

在整流部分调试过程中也间接检查了面板上的“给定”电位器是否接反，接反了则会出现直流电压几乎为最大，只有把“给定”电位器顺时针旋到头时，直流电压才会减小的现象。

3．2The regulate problems of commutate part
If there haven’t come out6pieces commutate wave during the regulating of commutate part.You have to check if the code of6 pieces tubes is correct connect.Or check if it meets short-load.
In the process of this regulation,it also has check the “given”indirectly,if the connect is not correct,the DC voltage will almost be max.We must to cycle the“given”by clockwise,then the DC voltage will reduce.
3．3整定额定输出电流中的注意事项
3．3Notice of setting rated output current
上电数秒钟后，把面板上的“给定”电位器顺时针慢慢旋大，这时逆变桥会出现两种工作状态，一种是逆变桥起振，另一种是逆变桥直通，此时需要的是逆变桥直通，若逆变桥为起振状态，可在停电的状态下，调节中频电压互感器的相位，即把中频电压互感器20V绕组的输出线对调一下，就不会起振了。

在缓慢旋大面板上“给定”电位器的操作中，应密切注意电流表的反应，若电流表的指示迅速增大，则应迅速把“给定”电位器逆时针旋下来，此时表明电流取样电路有问题，系统处于电流开环状态，应检查电流互感器是否接对，特别是5A：0.1A电流互感器的原、付边是否接反，0.1A绕组上的68Ω电阻是否接上。

正常的表现是随着“给定”电位器的缓慢加大，电流表的指示也跟着增大，当停止旋转“给定”电位器时，电流表的指示能稳定的停在某一刻度上。

After several seconds of electrify,cycle the“given”bigger by clockwise,the inverter bridge may has2working status:one is inverter bridge oscillate,the other is inverter bridge straight pass.At this moment,the inverter bridge must be straight pass,if it’s the oscillate status,you can regulate the phase of the intermediate frequency voltage transformer when it’s power cut.
When you cycle the“given”bigger slowly,please pay
attention to the ammeter.If the indication of the ammeter increasing quality,you must to cycle the“given”by counter-clockwise immediately.It shows that the circuit is trouble,the system stay in current open loop status,please check the
connection of the current transformer.The correct is when you cycle the“given”bigger slowly,the indication of ammeter will be increase with it;when you stop,the indication will stop in one scale.
当出现直通现象时，继续把面板上的“给定”电位器顺时针旋大，使直流电流表指示到额定电流的20%左右，用示波器观察主控板上D15的正极波形，即电流取样波形，(示波器探头的地线夹在主控板的跳线上)，正常的电流取样波形，应该是6个负极性波头高低一致，若波头相差太大，说明电流互感器的同名端没有接对，必须改对，否则会影响电流调节器的正常工作。

When it appears straight pass,continue to cycle the“given”bigger by clockwise,making the indication of DC ammeter20%of rated ing the oscillograph to espial anode wave of D15. The correct method is6pieces cathode wave will be almost height, if they have the long distance,it shows that the same name terminal of the current transformer is wrong,must be changed, otherwise,it will effect the operate of the current transformer.
需要指出的是，当平波电抗器的直流电阻较小时，在直通状态下作额定电流的整定，会出现直流电流振荡的现象，可在直流回路里串一点电阻加以解决，另外，水冷装置在作此项调试时，必须通水冷却。

We need to indicate that when the DC resistor of the reactor is small,under the straight pass status,if we do the current setting,it may appear DC current surge.You can bunch a resistor in the DC loop.By the way,you have to water-cool when you regulate the water-cooling equipment.
当调试场地的电源供不出装置的额定电流时，额定电流的整定，可放在现场满负荷运行时进行。

这与一般的中频电源的电流整定是一样的。

但是，应先在小电流的状况下，判定一下电流取样回路的工作是否正常。

3．4校准频率表
若中频电源用的是专用中频频率表，则可免去此步调试。

但还是推荐使用直流毫安表头改制的频率表，这一方面是可以测得最高它激频率，另一方面是价格便宜。

3．4Adjust the frequency table
You don’t need to do this regulation if you use special intermediate frequency table.But I still recommend you to use the frequency table strypped-down with DC milliammeter.
3．5逆变脉冲的简便检查
为了判断逆变晶闸管的门级线连接是否正确，首先检查逆变末级上的LED亮度是否正常，不太亮则说明逆变未级的E和C端子接反了，再把主控板上CON3-5对外的连线解掉，看熄灭的LED末级是否处在逆变桥的对角线位置。

3．5Simple check of inverter pulse
In order to judge the correct of the line,please check the LED bright of the inverter.If it’s not very bright,it shows that E&C terminal is connect wrong.You need to untie the outer connection of CON3-5.
3．6逆变不起振
若把中频电压互感器20V绕组输出线对调后，仍然启动不起来，此时应确认一下槽路的谐振频率是否正确，可以用电容/电感表测量一下电热电容器的电容量及感应器的电感量，计算出槽路的谐振频率，当槽路的谐振频率处在最高它激频率的0.6－0.9的范围内时，起动应该是很容易的。

再者就是检查一下晶闸管是否有损坏的。

3．6No oscillation of inverter
If it’s still can’t start-up after you change over the20V output line of intermediate frequency voltage transformer,you need to confirm if the syntony frequency is correct.You can use the。