ICS TRIPLEX T9300处理器卡件,ABB卡件
它还可能导致锁定时间超过可能已激活的“启动间隔时间”锁定。这种热锁定将保持，直到电机冷却到可接受的启动温度。b） 启动/小时当469测量到无电机电流过渡到某个电机电流值时，假设电机启动。此时，一个“开始/小时”计时器将加载60分钟。即使启动尝试失败，也会记录为该功能的启动。电机停止后，将过去一小时内的启动次数与允许的启动次数进行比较。如果这两个数字相同，则会发生块。如果发生阻塞，锁定时间将等于从过去一小时内开始以来经过的最长时间，减去一小时。例如，如果最大启动/小时允许编程为“2”，•一次启动发生在T=0分钟，•第二次启动发生于T=17分钟，•电机停止在T=33分钟，•发生阻塞，•锁定时间为1小时–33分钟=27分钟。c） 启动之间的时间当469测量到无电机电流过渡到某个电机电流值时，假设电机启动。此时，“启动之间的时间”计时器将加载输入的时间。即使启动尝试失败，也会记录为该功能的启动。一旦电机停止，如果自最近一次启动以来经过的时间小于“允许启动之间的时间”设定值，则会发生阻塞。如果发生块，则锁定时间将等于从最近一次启动后经过的时间减去“允许启动之间的时间”。值“0”有效地禁用了此元素。例如，如果“允许启动之间的时间”编程为25分钟。•在T=0分钟时启动，•在T=12分钟时电机停止，•发生阻塞，•锁定时间为25分钟–12分钟=13分钟❙ 缓动滑车❙ [输入]更多JOGGING BLOCK:Off Range：开，关最大允许启动/小时：3范围：1到5，步骤1允许启动之间的时间：10分钟范围：0到500分钟。，步骤1输入退出消息退出消息退出4-56 469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 4.8.4重启块重启块功能可用于确保在停止电机和重启电机之间经过一定时间。该计时器功能对于某些工艺应用或电机考虑可能非常有用。如果电机在井下泵上，在电机停止后，液体可能会从管道中回落，并使转子向后旋转。此时启动电机是非常不可取的。在另一种情况下，电机可能驱动非常高的惯性负载。一旦电机的电源断开，转子可能会在减速时继续转动很长一段时间。电机现在变成了发电机，施加异相电源电压可能会导致灾难性故障。
It may also cause a lockout time that exceeds a Time Between Starts lockout that may have been active. Such a thermal lockout will remain until the motor has cooled to an acceptable temperature for a start. b) STARTS / HOUR A motor start is assumed to be occurring when the 469 measures the transition of no motor current to some value of motor current. At this point, one of the Starts/Hour timers is loaded with 60 minutes. Even unsuccessful start attempts will be logged as starts for this feature. Once the motor is stopped, the number of starts within the past hour is compared to the number of starts allowable. If the two numbers are the same, a block will occur. If a block occurs, the lockout time will be equal to the longest time elapsed since a start within the past hour, subtracted from one hour. For example, if MAX. STARTS/HOUR PERMISSIBLE is programmed at "2", • one start occurs at T = 0 minutes, • a second start occurs at T = 17 minutes, • the motor is stopped at T = 33 minutes, • a block occurs, • the lockout time would be 1 hour – 33 minutes = 27 minutes. c) TIME BETWEEN STARTS A motor start is assumed to be occurring when the 469 measures the transition of no motor current to some value of motor current. At this point, the Time Between Starts timer is loaded with the entered time. Even unsuccessful start attempts will be logged as starts for this feature. Once the motor is stopped, if the time elapsed since the most recent start is less than the TIME BETWEEN STARTS PERMISSIBLE setpoint, a block will occur. If a block occurs, the lockout time will be equal to the time elapsed since the most recent start subtracted from the TIME BETWEEN STARTS PERMISSIBLE. A value of "0" effectively disables this element. For example, if TIME BETWEEN STARTS PERMISSIBLE is programmed = 25 min. • a start occurs at T = 0 minutes, • the motor is stopped at T = 12 minutes, • a block occurs, • the lockout time would be 25 minutes – 12 minutes = 13 minutes ❙ JOGGING BLOCK ❙ [ENTER] for more JOGGING BLOCK: Off Range: On, Off MAX. STARTS/HOUR PERMISSIBLE: 3 Range: 1 to 5, step 1 TIME BETWEEN STARTS PERMISSIBLE: 10 min. Range: 0 to 500 min., step 1 ENTER ESCAPE ð ð MESSAGE ESCAPE MESSAGE ESCAPE 4-56 469 Motor Management Relay GE Power Management 4.8 S7 MOTOR STARTING 4 SETPOINT PROGRAMMING 4 4.8.4 RESTART BLOCK The Restart Block feature may be used to ensure that a certain amount of time passes between stopping a motor and restarting that motor. This timer feature may be very useful for some process applications or motor considerations. If a motor is on a down-hole pump, after the motor stops, the liquid may fall back down the pipe and spin the rotor backwards. It would be very undesirable to start the motor at this time. In another scenario, a motor may be driving a very high inertia load. Once the supply to the motor is disconnected, the rotor may continue to turn for a long period of time as it decelerates. The motor has now become a generator and applying supply voltage out of phase may result in catastrophic failure.
