VDI7700XGE
如果循环重复减速，则必须考虑连续功率。如果循环时间
大于要吸收的能量EB和持续功率PPR的比率，内部制动
电阻足够。如果系统减速更频繁，则内部制动电阻不足。
在此示例中，EB/PPR的比率为8.8 s。如果循环时间为
更短的
外部制动电阻器的额定值
制动电阻额定值的特性曲线
这两个特性也用于电机的额定值。特性曲线的分段
待考虑的项目由Di指定
（D1…D3）。
总惯量Jt
必须知道恒定减速时的能量计算。。
Jt公司
=Jm+Jc
Jm：电机惯性（带抱闸）
Jc：负载惯性
每个减速段的能量计算如下：
分段计算（D1）…（D3）：
单位：Ei
在Ws（瓦特秒），Jt
单位为kgm2，ω单位为rad和ni
小值为1。
工程
0198441113767 09/2017 83
装置的能量吸收Evar见技术数据（不考虑制动
电阻器）。
在接下来的计算步骤中，仅考虑这些段Di
，其能量Ei
超过能量
设备的吸收。这些多余能量EDi必须通过制动电阻器转移。
EDi使用以下公式计算：
EDi=Ei
-Evar（在Ws中）
计算每个机器循环的连续功率Pc：
单位：以W表示的Pc、以Ws表示的EDi和以s表示的周期时间T
选择分两步进行：
 如果满足以下条件，则内部制动电阻足够。
 减速期间的大能量必须小于制动电阻
可吸收：（EDi）<（ECr）。
 不得超过内部制动电阻器的持续功率：（PC）<（PPr）。
 如果不符合条件，则必须使用符合条件的外部制动电阻器。
有关外部制动电阻器的订单数据，请参阅“附件和备件”一章（参见第635页）。

If the deceleration is repeated cyclically, the continuous power must be taken into account. If the cycle time is longer than the ratio of the energy to be absorbed EB and the continuous power PPR, the internal braking resistor is sufficient. If the system decelerates more frequently, the internal braking resistor is not sufficient. In this example, the ratio of EB/PPR is 8.8 s. An external braking resistor is required if the cycle time is shorter. Rating the External Braking Resistor Characteristic curves for rating the braking resistor These two characteristics are also used for the rating the motor. The segments of the characteristic curves to be considered are designated by Di (D1 ... D3). The total inertia Jt must be known for the calculation of the energy at constant deceleration.. Jt = Jm + Jc Jm: Motor inertia (with holding brake) Jc: Load inertia The energy for each deceleration segment is calculated as follows: Calculation for the segments (D1) … (D3): Units: Ei in Ws (wattseconds), Jt in kgm2, ω in rad and ni in min-1. Engineering 0198441113767 09/2017 83 See the technical data for the energy absorption Evar of the devices (without consideration of a braking resistor). In the next calculation steps, only consider those segments Di , whose energy Ei exceeds the energy absorption of the device. These excess energies EDi must be diverted by means of the braking resistor. EDi is calculated using the following formula: EDi = Ei - Evar (in Ws) The continuous power Pc is calculated for each machine cycle: Units: Pc in W, EDi in Ws and cycle time T in s The selection is made in two steps:  If the following conditions are met, the internal braking resistor is sufficient.  The maximum energy during deceleration must be less than the peak energy that the braking resistor can absorb: (EDi)<(ECr).  The continuous power of the internal braking resistor must not be exceeded: (PC)<(PPr).  If the conditions are not met, you must use an external braking resistor that meets the conditions. For order data for the external braking resistors, see chapter Accessories and Spare Parts (see page 635).