TDE MACNO OPD EXP - Page 34

34
P64
Voltage
regulator
Vnom2
125PVbus
×
×
Estimated flux
weakening voltage
+
-
0-100%
P36
Voltage
reference value
Delivered
voltage module
P
80;
P
81 and
P
82
Flux current
reference value
Constant power working area
(
flu
x
weakenin
g
)
D09
D18
The flux current is normalized in relation to the magnetizing current (P73), the rotor flux is normalized
in relation to the rated flux and is displayed as a percentage in d27. The stator voltage module is
normalized in relation to the rated motor voltage (P62) and is displayed as a percentage in d18 and
as a value in Volt rms in d17
The constants of this regulator are established in engineering units by parameters P80, proportional
gain Kp; P81, time in ms of the lead time constant Ta equal to the integral regulator time constant
multiplied by the gain (Ta = Ti*Kp); and P82, filter constant in ms.
Parameters P80 and P81 cannot be changed directly because they are considered to be
perfectly calculated by the auto-tuning.
They can only be changed by accessing TDE MACNO reserved parameter P127 “Multiplication
coefficient Kp and Ta flux loop”
The voltage/flux regulator limit is normally set at
± rated motor current so that the total flux may be
changed quickly during the transient state.
If the estimated flux drops below 5% of the rated flux, the lower voltage regulator limit is brought to a
value that will generate a flux of at least 4%. This is done so as not to lose control in a zone where
the flux has been weakened widely.
2.2.5.1 STARTUP WITH A MOTOR MAGNETIZED
C38 provides 3 different ways for starting up the motor:
When the machine is magnetized, it means that the motor is powered and that a current equal
to the magnetizing current is being delivered. Thus special care must be taken especially
when C38
≠ 0 in that a voltage ≠ 0 may be created on terminals U,V,W without enabling the
RUN command
C38=0 Standard
operation
When RUN is enabled, the machine is magnetized with the maximum
delivered torque at zero for a time equal to P29. The flux is then checked to
see whether it exceeds the minimum (P52). If it does, the torque is “freed”, if it
does not the drive triggers alarm A2 “Machine not magnetized”.
C38=1 Enable independent flux
In this case, logic input (I15) is used to magnetize the machine. After setting
I15=H (configuring one of the logic inputs as required) the machine is
magnetized with the maximum delivered torque at zero for a time equal to P29.
The flux is then checked to see whether it exceeds the minimum (P52). If it
does, the torque is “freed”; the display shows that the machine has been
magnetized and the next time the RUN command is enabled, the motor will
start up straight away. If the flux does not exceed the minimum, the drive
triggers alarm A2 “Machine not magnetized”
C38=2 Machine always magnetized
The machine is always magnetized. If the flux drops below the minimum value
(P52) the drive triggers alarm A2.
If the drive is ready, the motor will start up as soon as the Run command is
enabled.