NORD Drivesystems BU0750 - Manual (Page 91)

7.5 Speed control
BU 0750 GB-3311 Subject to technical amendments 91
Parameter Setting value / Description / Note
Parameter
set
Available with option
P312 Torque current controller P P
ENC POS
0...800 %
[ 200 ] Current controller for the torque current. The higher the current controller parameters are set, the
more precisely the current setpoint is maintained. Excessively high values in P312 generally lead to
high-frequency vibrations at low speeds, on the other hand, excessively high values in P313
generally produce low frequency vibrations across the whole speed range. If the value "Zero" is
entered in P312 and P313, then the torque current control is switched off. In this case, only the
precontrol for the motor model is used.
P313 Torque current controller I P
ENC POS
0...800 % / ms
[ 125 ]
I-component of the torque current controller. (See also P312 >Torque current controller P<)
P314 Torque current controller limit P
ENC POS
0...400 V
[ 400 ] Determines the maximum voltage increase of the torque current controller. The higher the value, the
greater the maximum effect that can be exercised by the torque current controller. Excessive values
in P314 can specifically lead to instability during transition to the field weakening zone (see P320).
The values for P314 and P317 should always be set roughly the same, so that the field and torque
current controllers are balanced.
P315 Field current controller P P
ENC POS
0...800 %
[ 200 ] Current controller for the field current. The higher the current controller parameters are set, the more
precisely the current setpoint is maintained. Excessively high values for P315 generally lead to high
frequency vibrations at low speeds. On the other hand, excessively high values in P316 generally
produce low frequency vibrations across the whole speed range If the value "Zero" is entered in
P315 and P316, then the field current controller is switched off. In this case, only the precontrol for
the motor model is used.
P316 Field current controller I P
ENC POS
0...800 % / ms
[ 125 ]
I-component of the field current controller. See also P315 >Field current controller P<
P317 Field current controller limit P
ENC POS
0...400 V
[ 400 ] Determines the maximum voltage increase of the field current controller. The higher the value, the
greater is the maximum effect that can be exercised by the field current controller. Excessive values
in P317 can specifically lead to instability during transition to the field reduction range (see P320).
The values for P314 and P317 should always be set roughly the same, so that the field and torque
current controllers are balanced.
P318 Field weakening controller P P
ENC POS
0...800 %
[ 150 ] The field weakening controller reduces the field setpoint when the synchronous speed is exceeded.
Generally, the field weakening controller has no function; for this reason, the field weakening
controller only needs to be set if speeds are set above the nominal motor speed. Excessive values
for P318 / P319 will lead to controller oscillations. The field is not weakened sufficiently if the values
are too small or during dynamic acceleration and/or delay times. The downstream current controller
can no longer read the current setpoint.
P319 Field weakening controller I P
ENC POS
0...800 % / ms
[ 20 ]
Only affects the field weakening range, see P318 >Field weakening controller P<