10. CONCRETOS
10.2 MATERIALES, MANEJO Y ALMACENAMIENTO
Function: This function executes „automatic parameterization“ (+ Section 8.1.5) and then subsequently activates the ground-fault test, test pulse measurement, leakage measurement and carries-out the DC current measurement to improve the control characteristics.
In so doing, the control parameters are re-assigned.
Condition: The „motor identification at standstill“ can be selected from the „drive setting“ (P052 = 5) or READY TO SWITCH-ON (009).
Result: ♦ Only the parameters of the currently selected motor data set MDS are pre-assigned!
♦ The „motor identification at standstill“ can be interrupted at any time using an OFF command. In this case, fault message F114 „measurement aborted“ is output.
♦ To display the actual measuring segment of the „motor identification at standstill“ the visualization parameter (display parameter) r333 „measurement section“ is available.
♦ If a fault/error occurs during measurement, the test is terminated with a fault message.
The fault message (r947) is stored together with the fault value (r949) in the fault memory. The fault cause is described in detail in the fault value. The fault messages, fault values and alarm messages are described in Chapter 12 „Fault- and alarm messages“.
NOTE
The „motor identification at standstill“ is not possible when operating the drive converter with synchronous motors or for drive convertes with input voltages of between 500 V and 575 V with sinusoidal filter (option)!
Procedure:
⇓ P052 = 7 Function selection, „motor identification at standstill“
⇓ P key The operating display appears:
The alarm message A078 „standstill measurement follows“ is output, and the drive converter must be powered-up within 20 s. Otherwise, F114 fault trip „measurement aborted“ is output.
⇓ Power-up the drive converter
Alarm message A078 „standstill measurement follows“ is reset.
NOTE
The inverter is enabled, current flows through the motor and the rotor can align itself!
⇓ The operational display appears, while the following steps are automatically executed:
♦ „Automatic parameterization“ is called-up (+ Section 8.1.5).
♦ Ground-fault test:
When the drive converter is operated from a grounded line network, a ground fault in the connected motor (including feeder cables) is identified, if the ground fault current > 5 % Îrated (drive converter). Further, defective transistors, which are still conductive, are identified in the inverter.
The tests consists of 7 steps. No transistor is fired in the 1st step, and in additional steps, precisely one transistor is fired.
In each step, the actual values of the output currents, phases U and W, the UCE checkback signals of the 3 phases, the overcurrent comparator, and the overvoltage comparator monitored.
The visualization parameter r358 (ground fault test result) is available, from which the measurement result which caused the fault, can be read-out.
Comment: The ground fault test can also be separately called-up using parameter 354 (ground- fault test).
♦ Test pulses:
These are used to check the inverter and the connection to the motor. The test result can be interrogated in visualization parameter r344 (test pulse result).
♦ Leakage measurement:
By injecting suitable voltage pulses, the referred total leakage x(sigma) of the connected motor is measured.
♦ DC current measurement and the resulting parameter change:
With the DC current measurement, a DC current is impressed in the individual drive converter output phases one after another.
In this case, a maximum DC current, having the magnitude of the peak rated motor current (max. rated drive converter current) is impressed. The drive converter pulse frequency is changed several times during the measurement.
At the start of the standstill measurement, all parameters are calculated by the „automatic parameterization“ (
+
Section 8.1.5).Measured/calculated parameter values of the standstill measurement: P103 No-load motor current
P189 Energization time P198 R(rotor) Ktmp P253 Current controller Kp P272 R (stator + cable) P287 EMFcontroller Kp P289 EMFcontrollerTn P371 De-energization time
P652 CU-AE offset (if an analog tachometer is connected) r196 No-load current in A r199 R(rotor) r200 T(rotor) r274 T(sigma) „X(magnet)“ „X(sigma)“
„Deadtime compensation time“ „Transistor voltage compensation“
The measured values and the resulting calculated values, are only entered into the parameters after the DC current measurement has been correctly completed. If the measurement is aborted as a result of an off command or default, the parameter values, which were calculated at the start of the measurement in automatic parameterization, are kept.
⇓ The READY TO SWITCH-ON (009) operating display appears after the selected function has been completed.
8.1.6.1 Complete motor identification (P052 = 8)
Function: For vector control types (P163 = 3, 4, or 5), it is used to improved the control characteristics and includes the following functions:
♦ „Motor identification at standstill“ (includes „automatic parameterization“)
♦ „No-load measurement“ (includes „tachometer test“)
♦ „n/f controller optimization“
Condition: The „complete motor identification“ can be selected from the „drive setting“ status (P052 = 5) or READY TO SWITCH-ON (009).
Result: ♦ Only the parameters of the currently selected motor data set MDS or setpoint channel data set SDS are pre-assigned!
♦ The „complete motor identification“ can be terminated at any time using an OFF command. In this case, fault message F114 „measurement aborted“ is output.
♦ Visualization parameter r333 (measurement segment) is available to display the actual measurement segment of the „complete motor identification“.
If an error occurs during the measurement, the test is aborted with an error message. Fault message (r947) is saved, together the the fault value (r949) in the fault memory. The cause of the fault is described in detail in the fault value. The fault messages, fault values and alarm messages are described in Chapter 12 „Fault- and alarm messages“.
♦ For P163 = 5 (closed-loop torque control), the unit is automatically changed over into the closed-loop speed control mode for the duration of the measurement.
♦ For P163 = 3 or 4 (closed-loop frequency/speed control and slave drive (refer to P587), the measurement is aborted (F096).
♦ Parameter P377should be set to 1 (Vdmax controller on) if the drive converter has no possibility of regenerating (rectifier/regenerative feedback unit or brake resistor).
However, if the drive converter still aborts the measurement with fault F006 (DC link
overvoltage), the regenerative power should be limited to approx. –3 % to –0.1 % in parameter P233.
NOTE
The "motor identification at standstill" is not possible when operating the drive converter with synchronous motors or for drive converters with input voltages from 500 V to 575 V with sinusoidal filter (option)!
Procedure:
⇓ P452, P453 = Maximum frequencies
The drive speed during the measurement is limited to the parameter values for the maximum frequencies P452 (Rdf) and P453 (Ldf) in the actual motor data set. The maximum frequencies must be set before the measurement starts, so that a load possibly connected to the motor, is not damaged.
⇓ P492, P498 = Maximum torque during the measurement is limited to the parameter values for torque limits
P492 (Mlimit 1) and P498 (Mlimit 2) in the actual motor data set.
The torque limits must be set before the measurement is started, so that a load, possibly connected to the motor, is not damaged.
⇓ P346 = Dynamic performance factor
Set the required dynamic performance (speed) of the speed controller (in %): Whereby: 10 % (lowest) and 200 % (max. possible)
Note: Possible gearbox play, etc.
⇓ P key: The operating display appears:
Alarm message A078 „standstill measurement follows“ is output, and the drive converter must be powered-up within 20 s. Otherwise, the unit is fault tripped with F114
„measurement aborted“.
⇓ Power-up the drive converter
Alarm message A078 „standstill measurement follows“ is reset.
NOTE
The inverter is enabled, current flows through the motor and the rotor can align itself!
⇓ The operating display appears while the „motor identification at standstill“ function is being automatically executed (+ Section 8.1.6).
⇓ After the partial function has been completed, the READY TO SWITCH-ON (009) operating display appears alternating with alarm message A080 „rotating measurement follows“. The drive converter must be powered-up within 20 s, otherwise the unit is fault tripped and F114 „measurement aborted“ is output.
NOTE
When aborted at this point, the parameter changes of the previous „motor identification at standstill“ are saved.
Procedure ⇓Power-up the drive converter
Alarm message A080 „rotating measurement follows“ is reset.
NOTE
The inverter is enabled, current flows through the motor and the rotor rotates!
⇓ The operating display appears while the following steps are automaticaly executed:
♦ „No-load measurement“ is called-up“ (+ Section 8.1.7) including tachometer test for P163 = 4 or 5.
♦ „n/f controller optimization“ is called-up“ (+ Section 8.1.8).
⇓ After the selected function has been completed, the READY TO SWITCH-ON (009) operating display appears