3/17/2022 12:02 PM | |
Joined: 10/11/2006 Last visit: 9/18/2024 Posts: 5906 Rating: (804)
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Hello, F07902 (N, A) Drive: Motor stalled Message class: Application/technological function faulted (17) Reaction: OFF2 (IASC/DCBRK, NONE, OFF1, OFF3, STOP2) Acknowledge: IMMEDIATELY Cause: The system has identified that the motor has stalled for a time longer than is set. Fault value (r0949, interpret decimal): 1: Reserved. 2: Stall detection using r1408.12 (p1745) or via (r0084 ... r0083). Remedy: Steps should always be taken to ensure that both motor data identification and the rotating measurement were (if possible) carried out (see p1900, r3925). - Check whether the drive is in the open-loop speed control operating range (see p1755), or if the speed setpoint is still zero, whether the load alone caused the drive to stall. If yes, increase ramp-up time p1120, increase ramp-down time p1121 and increase current setpoint via p1610, p1611. - If the excitation time (p0346) of the induction motor was significantly reduced and the drive stalls when it is switched on and immediately run, then p0346 should be increased again. - check whether the motor cables are disconnected (see A07929). If there is no fault, then the fault tolerance can be increased (p1745). - check the current limits (p0640, r0067, r0289). If the current limits are too low, then the drive cannot be magnetized. - If the fault occurs with fault value 2 when the motor accelerates very quickly to the field weakening range, the deviation between the flux setpoint and flux actual value can be reduced and, in turn, the message prevented, by reducing p1553. General hints: Chapter 8.13 For applications with a suspended load, such as cranes and elevators, there is a danger to life if the "Motor holding brake" function is not completely set or is incorrectly set. • When commissioning the "Motor holding brake" function, secure any suspended loads, e.g. by applying the following measures: – Lower the load down to the floor. – Secure the dangerous area so that nobody can inadvertently enter it. • Set the "Motor holding brake" function according to the following description. • After commissioning, check that the motor holding brake and the motor control function reliably. • For applications involving suspended loads, we recommend that you use vector control together with an encoder. Chapter 8.20 The load falls due to incorrect closed-loop control settings For encoderless vector control, the converter calculates the actual speed based on an electric motor model. In applications with pulling loads - e.g. hoisting gear, lifting tables or vertical conveyors - an incorrectly set motor model or other incorrect settings can mean that the load falls. A falling load can result in death or serious injury. • Correctly set the motor data during the quick commissioning. • Carry out the motor data identification. • Correctly set the "Motor holding brake" function. Motor holding brake (Page 258) • For pulling loads, carefully comply with the recommended settings for vector control. Advanced settings (Page 331) 8.20.3.3 Advanced settings Overview Special settings for a pulling load For a pulling load, e.g. a hoisting gear, a permanent force is exerted on the motor, even when the motor is stationary. For a pulling load, we recommend that you use vector control with an encoder. Function description If you use sensorless vector control with a pulling load, then the following settings are required: • Set the following parameters: • When opening the motor holding brake, enter a speed setpoint > 0. For speed setpoint = 0, and with the motor holding brake open, the load drops because the induction motor rotates with the slip frequency as a result of the pulling load. • Set the ramp-up and ramp-down times ≤ 10 s in the ramp-function generator. • If, in quick commissioning, you have selected application class Dynamic Drive Control then set p0502 = 1 (technological application: dynamic starting or reversing). https://support.industry.siemens.com/cs/de/en/view/109782995 |
With best regards, |
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