VE5026模块备件

VE5026

图3-34电线连接
通常，控制电缆应为屏蔽电缆
屏蔽金属网必须连接到
电缆夹驱动的金属外壳。
PE PE
外壳
图3-35屏蔽层的正确屏蔽方法
体育课
体育课
外壳
图3-36屏蔽层接地方式不正确
3.4.3接地
独立接地极（佳）
驾驶其他
设备
体育课
图3-37接地图1
共用接地极（良好）
驾驶
另外
设备
体育课
图3-38接地图2
共用接地电缆（不好）
驾驶
另外
设备
体育课
图3-39接地图3
驾驶
另外
设备
PE（G）
图3-40接地图4
此外，还应注意以下几点：
为了降低接地电阻，扁平电缆
应使用，因为高频阻抗
扁平电缆的直径小于圆形电缆的直径
与CSA相同。
对于4芯电机电缆，一根电缆的末端应为
连接到驱动器的PE，另一端
应连接至电机外壳。如果
电机和驱动器各有自己的接地极，然后
接地效果更好。
如果不同设备的接地极在一个
系统连接在一起，则泄漏电流
将是可能干扰整个系统的噪声源。
因此，驱动器的接地极应分开
与音频等其他设备的接地极连接
设备、传感器和PC等。
为了降低高频阻抗
用于固定设备的螺栓可用作
34第3章安装和布线
EV2000系列通用变速驱动用户手册
高频终端。螺栓上的油漆应：
被清洁。
接地电缆应尽可能短，即
即，接地点应尽可能靠近驱动器
可能的
接地电缆应尽可能远离I/O
对噪声敏感的设备电缆，以及
也应尽可能短。
3.4.4继电器、接触器和
电磁制动套件
继电器、接触器和
电磁制动套件，可产生
噪音，应安装在驱动柜外部
并应安装浪涌抑制器。
220VAC
变阻器
二极管
逆变器
220VAC
RC滤波器
+24VDC
图3-41继电器、接触器和电磁制动套件
3.4.5泄漏电流
漏电流可能流经驱动器的输入端，并且
输出电容器和电机电容器。这个
泄漏电流值取决于分布
电容和载波频率。泄漏
电流包括接地泄漏电流和漏电
线间电流。
交流电源
驾驶
分布的
电容器
字里行间
发动机
分布的
电容器
电缆和接地
电容器
之间
马达和
世界
R
S
T
QF
图3-42泄漏电流的流动路径
接地泄漏电流
接地泄漏电流不仅可以流入
驱动系统，以及通过接地的其他设备
电缆。可能导致断路器泄漏电流
并且继电器被错误地激活。驱动器越高
漏电流越大，
此外，电机电缆越长，泄漏越大
现在的
抑制方法：
降低载波频率，但降低电机噪声
可以更大声；
电机电缆应尽可能短；
驱动器和其他设备应使用泄漏
电流断路器设计用于保护
针对高次谐波/浪涌泄漏的产品
现在的
线间漏电流
流经配电的线路泄漏电流
驱动输出侧的电容器可能会导致热
继电器错误激活，尤其是对于驱动器
功率低于7.5kW。当电缆较长时
大于50m，泄漏电流与电机额定值之比
电流可能会增加，从而导致错误
外部热继电器的动作非常容易。
抑制方法：
降低载波频率，但降低电机噪声
可能变得更响；
在驱动器的输出侧安装电抗器。
为了可靠地保护电机，建议
使用温度传感器检测电机的
温度，并使用驱动器的过载保护
设备（电子热继电器），而不是外部
热继电器。
3.4.6正确的EMC安装
将安装空间划分为不同区域
在驱动系统中，驱动、控制设备和
传感器安装在同一机柜中，噪音
应在主要连接点处抑制
RFI滤波器和输入电抗器安装在机柜中，以
满足EMC要求。
有效但昂贵的减少
干扰是隔离噪声源和噪声
接收器，应在
机械/系统设计阶段。在驱动系统中
噪声源可以是驱动、制动单元和接触器。
噪声接收器可以是自动化设备、编码器和
传感器
机械/系统

VE5026

VE5026

Fig. 3-34 Wire connections
Generally, the control cables should be shielded cables
and the shielding metal net must be connected to the
metal enclosure of the drive by cable clamps.
PE PE
enclosure enclosure
Fig. 3-35 Correct shielding method of shielding layer
PE
PE
enclosure enclosure
Fig. 3-36 Incorrect earthing method of shielding layer
3.4.3 Earthing
Independent earthing poles (best)
Drive Other
equipment
PE
Fig. 3-37 Earthing diagram 1
Shared earthing pole (good)
Drive
Other
equipment
PE
Fig. 3-38 Earthing diagram 2
Shared earthing cable(not good)
Drive
Other
equipment
PE
Fig. 3-39 Earthing diagram 3
Drive
Other
equipment
PE（G）
Fig. 3-40 Earthing diagram 4
Besides, pay attention to the following points:
In order to reduce the earthing resistance, flat cable
should be used because the high frequency impedance
of flat cable is smaller than that of round cable with the
same CSA.
For 4-core motor cable, the end of one cable should be
connected to the PE of the drive, and the other end
should be connected to the motor’s enclosure. If the
motor and the drive each has its own earthing pole, then
the earthing effect is better.
If the earthing poles of different equipment in one
system are connected together, then the leakage current
will be a noise source that may disturb the whole system.
Therefore, the drive’s earthing pole should be separated
with the earthing pole of other equipment such as audio
equipment, sensors and PC, etc.
In order to reduce the high frequency impedance, the
bolts used for fixing the equipment can be used as the 
34 Chapter 3 Installation and Wiring
EV2000 Series Universal Variable Speed Drive User Manual
high frequency terminal. The paints on the bolt should
be cleaned.
The earthing cable should be as short as possible, that
is, the earthing point should be as close to the drive as
possible.
Earthing cables should be as far away from the I/O
cables of the equipment that is sensitive to noise, and
also should be as short as possible.
3.4.4 Installation Requirements of Relay, Contactor and
Electro-magnetic Braking Kit
The devices such as relay, contactor and
electro-magnetic braking kit, which may generate great
noises, should be installed outside of the drive cabinet
and should be installed with surge suppressors.
220VAC
Varistor
Diode
Inverter
220VAC
RC-Filter
+24VDC
Fig. 3-41 Relay, contactor and electro-magnetic braking kit
3.4.5 Leakage Current
Leakage current may flow through the drive’s input and
output capacitors and the motor’s capacitor. The
leakage current value is dependent on the distributed
capacitance and carrier wave frequency. The leakage
current includes ground leakage current and the leakage
current between lines.
AC supply
Drive
Distributed
capacitor
between lines
Motor
Distributed
capacitor between
cable and earth
Capacitor
between
motor and
earth
R
S
T
QF
Fig. 3-42 Flowing path of leakage current
Ground leakage current
The ground leakage current can not only flow into the
drive system, but also other equipment via earthing
cables. It may cause the leakage current circuit breaker
and relays falsely activated. The higher the drive’s
carrier wave frequency, the bigger the leakage current,
also, the longer the motor cable, the greater the leakage
current,
Suppressing methods:
Reduce the carrier wave frequency, but the motor noise
may be louder;
Motor cables should be as short as possible;
The drive and other equipment should use leakage
current circuit breaker designed for protecting the
product against high-order harmonics/surge leakage
current;
Leakage current between lines
The line leakage current flowing through the distribution
capacitors of the drive out side may cause the thermal
relay falsely activated, especially for the drive whose
power is lower than 7.5kW. When the cable is longer
than 50m, the ratio of leakage current to motor rated
current may be increased that can cause the wrong
action of external thermal relay very easily.
Suppressing methods:
Reduce the carrier wave frequency, but the motor noise
may become louder;
Install reactor at the output side of the drive.
In order to protect the motor reliably, it is recommended
to use a temperature sensor to detect the motor’s
temperature, and use the drive’s over-load protection
device(electronic thermal relay) instead of an external
thermal relay.
3.4.6 Correct EMC Installation
Divide the installation space into different areas
In driving system, the drive, control equipment and
sensors are installed in the same cabinet, the noise
should be suppressed at the main connecting points
with the RFI filter and input reactor installed in cabinet to
satisfy the EMC requirements.
The most effective but expensive measure to reduce the
interference is to isolate the noise source and the noise
receiver, which should be considered in
mechanical/system design phase. In driving system, the
noise source can be drive, brake unit and contactor.
Noise receiver can be automation equipment, coder and
sensor.
The mechanical/system is divided into different EMC
area according to its electrical characteristics. The
recommended installation positions are shown in the
following figure: