ICSI08E4工业卡件,DCS卡件
跳闸拾取水平可能必须设置得不太敏感，或者启动差异跳闸延迟可能必须延长，以便在启动过程中度过故障期。然后可以根据应用对运行差分延迟进行微调，以使其对敏感（低）差分电流水平的响应非常快。❙ 相位差，相位差❙ [输入]更多相位差跳闸：关断范围：关断、闭锁、未闭锁分配跳闸继电器：跳闸范围：跳闸、跳闸和辅助2、跳闸和辅2和辅3、辅助2、辅2和辅助3、辅助3启动差异。跳闸拾取：0.10 x CT范围：0.05至1.00 x CT，步进：0.01启动差异。脱扣延迟：0 ms范围：0至1000 ms，步进1运行差异，步骤：0.01运行差异跳闸延迟：0 ms范围：0到1000 ms，步骤1 ENTER ESCAPE（输入退出），步骤1输入退出消息退出消息退出信息退出消息退出注意：GE Power Management 469电机管理继电器4-53 4设定点编程4.8 S7电机启动4.8 S7电机起动4.8.1加速计时器热模型在启动和过载条件下保护电机。加速计时器跳闸功能可用于补充此保护。例如，如果电机总是在2秒内启动，但安全失速时间为8秒，那么当热模型将其下线时，让电机在失速状态下保持7或8秒是没有意义的。此外，在这段时间内施加到从动设备上的启动扭矩可能会造成严重损坏。如果启用，加速定时器跳闸元件的功能如下。当469测量到无电机电流向某个电机电流值的转变时，假设发生电机启动。通常，电流快速上升至超过FLA的值（例如6 x FLA）。此时，加速度计时器将用Acceleration Timer FROM START（从开始加速计时器）值（秒）初始化。如果在计时器到期之前电流未降至过载曲线拾取水平以下，则会发生加速跳闸。如果电机的加速时间是可变的，则应将此功能设置为刚好超过最长加速时间。一些电机软起动器可能允许电流缓慢上升，而其他电机软起动器则可能在整个启动过程中将电流限制在FLA以下。由于469是用于保护所有电机的通用继电器，它无法区分缓升时间的电机和已完成启动并进入过载状态的电机。因此，如果电机电流在启动后1秒内未上升到大于满载，则忽略加速计时器功能。在任何情况下，电机仍受到过载曲线的保护。❙ 加速计时器❙ [输入]更多加速计时器跳闸：关闭范围：关闭、锁定、未锁定分配跳闸继电器：跳闸范围：跳闸、跳闸和辅助2、跳闸和辅2和辅助3、跳闸和备用3加速计时器从启动：10.0 s范围：1.0至250.0秒。，步骤0.1输入退出信息退出信息退出注释4-54 469电机管理继电器GE电源管理4.8 S7电机启动4设定点编程4 4.8.2启动抑制a）功能启动抑制功能有助于防止电机在启动过程中因热容量不足而跳闸。最近五次成功启动时使用的最大热容量值乘以(
TRIP PICKUP level may have to be set less sensitive, or the STARTING DIFF. TRIP DELAY may have to be extended to ride through the problem period during start. The running differential delay can then be fine tuned to an application such that it responds very fast to sensitive (low) differential current levels. ❙ PHASE DIFFERENTIAL ❙ [ENTER] for more PHASE DIFFERENTIAL TRIP: Off Range: Off, Latched, Unlatched ASSIGN TRIP RELAYS: Trip Range: Trip, Trip & Auxiliary2, Trip & Aux2 & Aux3, Auxiliary2, Aux2 & Aux3, Auxiliary3 STARTING DIFF. TRIP PICKUP: 0.10 x CT Range: 0.05 to 1.00 x CT, step: 0.01 STARTING DIFF. TRIP DELAY: 0 ms Range: 0 to 1000 ms, step 1 RUNNING DIFF. TRIP PICKUP: 0.10 x CT Range: 0.05 to 1.00 x CT, step: 0.01 RUNNING DIFF. TRIP DELAY: 0 ms Range: 0 to 1000 ms, step 1 ENTER ESCAPE ð ð MESSAGE ESCAPE MESSAGE ESCAPE MESSAGE ESCAPE MESSAGE ESCAPE MESSAGE ESCAPE NOTE GE Power Management 469 Motor Management Relay 4-53 4 SETPOINT PROGRAMMING 4.8 S7 MOTOR STARTING 4 4.8 S7 MOTOR STARTING 4.8.1 ACCELERATION TIMER The thermal model protects the motor under both starting and overload conditions. The acceleration timer trip feature may be used to complement this protection. For example, if the motor always starts in 2 seconds, but the safe stall time is 8 seconds, there is no point letting the motor remain in a stall condition for 7 or 8 seconds when the thermal model would take it off line. Furthermore, the starting torque applied to the driven equipment for that period of time could cause severe damage. If enabled, the ACCELERATION TIMER TRIP element functions as follows. A motor start is assumed to be occurring when the 469 measures the transition of no motor current to some value of motor current. Typically current rises quickly to a value in excess of FLA (e.g. 6 x FLA). At this point, the Acceleration Timer will be initialized with the ACCELERATION TIMER FROM START value in seconds. If the current does not fall below the overload curve pickup level before the timer expires, an acceleration trip will occur. If the acceleration time of the motor is variable, this feature should be set just beyond the longest acceleration time. Some motor softstarters may allow current to ramp up slowly while others may limit current to less than FLA throughout the start. Since the 469 is a generic relay for protection of all motors, it cannot differentiate between a motor that has a slow ramp up time and one that has completed a start and gone into an overload condition. Therefore, if the motor current does not rise to greater than full load within 1 second on start, the acceleration timer feature is ignored. In any case, the motor is still protected by the overload curve. ❙ ACCELERATION TIMER ❙ [ENTER] for more ACCELERATION TIMER TRIP: Off Range: Off, Latched, Unlatched ASSIGN TRIP RELAYS: Trip Range: Trip, Trip & Auxiliary2, Trip & Aux2 & Aux3, Trip & Auxiliary3 ACCELERATION TIMER FROM START: 10.0 s Range:1.0 to 250.0 sec., step 0.1 ENTER ESCAPE ð ð MESSAGE ESCAPE MESSAGE ESCAPE NOTE 4-54 469 Motor Management Relay GE Power Management 4.8 S7 MOTOR STARTING 4 SETPOINT PROGRAMMING 4 4.8.2 START INHIBIT a) FUNCTION The Start Inhibit feature helps to prevent tripping of the motor during start if there is insufficient thermal capacity. The largest value of THERMAL CAPACITY USED from the last five successful starts is multiplied by (
