DYNAMIC BRAKING UNIT DBU-400 动力制动装置

具有直流母线和输入二极管整流桥的变频器(逆变器)适用于三相交流电动机在两个驱动象限内运行，在两个方向上旋转。只有制动单元才能使制动电流大于逆变器额定电流的10%。
如果没有制动装置，过快的减速会导致直流母线电压升高。
监管机构的回应是
•由于直流母线过压脱扣而关闭(例如在GV3000上:Fault HU)
•根据参数设置，延长设定的减速速率或增加输出频率。
通过使用动态制动单元(DBU)和制动电阻，可以将直流母线电路中的能量转换为热量。

拆下DBU的盖板后，在稳压卡的上边缘(BUC在中间，BUA在右边)可以接触到位置为460V / 415V的蓝色跳线插头。
这个跳线插头定义了DBU将DB电阻切换到DC总线的直流总线电压。当从库存中交付时，DBU因安全原因调整为460 V线电压。

为防止制动单元热过载，请确保制动单元在以下限制范围内工作:
在10分钟的时间范围内，允许的加载必须限制在以下任何形状的Imax x 2.5分钟的当前时间范围内，但以下情况除外:
在DBU-400电流负载下，Imax (400a)允许每10分钟播放110秒。

DYNAMIC BRAKING UNIT DBU-400

Frequency converters (Inverters) with DC bus and input diode rectifier bridge are suitable for the operation of three phase AC-motors in two drive quadrants, motoring in both directions of rotation. Braking with more than 10% of the rated inverter current is only possible with a braking unit.
Without a braking unit, an excessively rapid deceleration causes an increase in the DC bus voltage.
The regulator responds by
• shut-down due to DC bus overvoltage tripping (e.g. on GV3000: Fault HU)
• extending the set deceleration rate or increasing the output frequency depending on parameter setting.
By the use of a Dynamic Braking Unit (DBU) and braking resistor the energy in the DC bus circuit can be converted to heat.

After removing the cover plate of the DBU the blue jumper plug with positions 460V / 415V is accessible at the upper edge of the regulator card (middle on BUC, right on BUA).
This jumper plug defines the DC bus voltage at which the DBU switches the DB resistor to the DC bus. When delivered from stock the DBU is adjusted for safety reasons to 460 V line voltage.

To prevent thermal overload of the Braking Unit, assure that the unit works within the following limits:
In a time range of 10 minutes the permissible loading must be limited to the following current-time area of any shape Imax x 2.5 minutes, with the following exception:
On DBU-400 current loading Imax (400 A) is permitted for 110 seconds every 10 minutes.