Startup
ECW500 | 69
5. If necessary, make stability adjustments on the limiter until obtaining a current control without oscillations.
The adjustments can be low, because the slow control does not affect the system performance.
Kp LEOC: _____________
Ki LEOC: _____________
6. After testing the limiter stability, change again the high and low levels of limiter to the values required under
operation. If desired, also set the time to actuation of this limiter.
LEOC High level: __________________
LEOC Low level: __________________
LEOC Time to actuation: ___________________
10.6 TESTS ON THE ONLINE MODES
The following tests are also valid for start-up of synchronous motors, you just have to consider that the machine
is already spinning at synchronism speed or close to it.
1. Put the regulator in the MECC mode before matching the synchronism with the network. Do not allow the
parallel contacts to put the regulator in the parallel mode. Set the reference of the MECC so as to obtain the
same voltage of the bus/grid at the machine terminals. Wait for the synchronism.
Result: _____________________________________________________________________________
2. With the machine connected to the bus/grid and with the manual excitation, check the terminal current
measurement and three-phase active and reactive powers to check the polarity of the connections. If
necessary, invert the polarity of the current transformer.
Result: _____________________________________________________________________________
3. Configure the reactive control mode desired and transfer to this mode by executing the command by the
digital inputs, serial communication port or HMI. Be prepared to return to the MECC mode if an over
excitation of the machine occurs.
Reactive control modes: ____________________
Result: _____________________________________________________________________________
4. Configure the dynamic characteristics of the reactive mode (only MPFC and MRPC) applying variations to the
reference and checking the dynamic response.
Kp (MPFC or MRPC): _____________________
Ki (MPFC or MRPC): _____________________
5. With the machine operating in parallel, configure the reactive mode chosen to generate the minimum reactive
possible. Configure the low level of LEOC limiter to a value 15% above the excitation current at the minimum
of reactive. Increase the reference of reactive until the limiter becomes active.
Result: _____________________________________________________________________________
6. Check the dynamic response of the limiter and make the necessary adjustments. After the adjustments,
configure the high and low levels desired for normal operation.
LEOC High level: __________________
LEOC Low level: __________________
7. Configure the reactive mode chosen to generate the minimum reactive possible. Configure the low level of
LTOC limiter to a value 15% above the current at the setpoint with the minimum reactive. Increase the
reference of reactive until the limiter becomes active.
Result: _____________________________________________________________________________
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