WEG ECW500, Руководство пользователя

Страница: 76 / 84

Startup .
68 | ECW500
4. Keep the stability parameters of the MECC at the factory defaults values. If oscillation occurs in the excitation
current, adjust the stability parameters to improve the dynamics. In order to define the stability parameters,
reference steps about 5% to 10% can be applied. The current response must present neither oscillations nor
overshoot.
Kp proportional gain of the PI controller of the MECC mode: _________________________________
Ki integral gain of the PI controller of the MECC mode: ______________________________________
5. Set the reference of the MECC until reaching the rated voltage of the machine. The voltage can be checked
on the HMI measurement screen.
MECC reference for the rated voltage: ______________________
6. Check with an oscilloscope the excitation voltage. The waveform must be a square wave with maximum
proportional to the alternate voltage applied to the power input. The frequency must be around 2kHz and
with cyclic ratio with a value close to the one shown on the measurement screen of the HMI.
7. Change to automatic mode via digital inputs, command on the HMI or command via supervisory software.
Result: _____________________________________________________________________________
8. If the terminal voltage is not stable, an adjustment on the stability parameters must fix the oscillation.
In order to complete the stability adjustment, apply reference steps about 5% to 10% evaluating the
response of the voltage control.
Kp proportional gain of the PI controller of the MTVC mode: ___________________________________
Ki integral gain of the PI controller of the MTVC mode: _______________________________________
9. Turn off the regulator using the digital inputs or the HMI.
Result: ____________________________________________________________________________
10. Turn on the excitation in the MTVC mode checking if the start ramp occurs according to the configuration.
When it reaches the reference voltage, test the increment and decrement of the voltage reference by the
digital and analog inputs if used.
Result: _____________________________________________________________________________
10.5.2 Test of the Excitation Current Limiter
1. With the regulator still operating in the voltage control mode, check the excitation current with the
synchronous machine without load and with the reference of the MTVC control equal to the rated voltage of
the machine:
____________________________________________________________________________________
2. Reduce the voltage reference to the minimum allowed and check again the excitation current:
____________________________________________________________________________________
3. Configure the high level of the LEOC limiter to a value a slightly below than the verified in step 1. Set the low
level of LEOC to the value verified in step 2 and leave the actuation time at factory default. Keep the stability
parameters at factory defaults values.
LEOC High level: __________________
LEOC Low level: __________________
4. Change the reference of the MTVC mode for the rated value of the machine. The limiter must act
immediately, holding the excitation current in the value adjusted as high level. After 10 seconds, the
excitation current must be limited to the value set at the low level.
Result: _____________________________________________________________________________