Nord Drivesystems SK 510P - Page 100

NORDAC PRO (SK 500P) – Users Manual for Frequency Inverters
100 BU 0600 en-2319
P315 Field curr. ctrl. P S P
Setting range 0 … 1000 %
Factory setting
{ 400 }
Description
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 lead time for the motor model is
used.
P316 Field curr. ctrl. I S P
Setting range
0 … 800 % / ms
Factory setting { 50 }
Description
I component of the field current controller (see P315 "Field current controller P").
P317 Field curr. ctrl. lim. S P
Setting range
0 … 400 V
Factory setting { 400 }
Description
"Field current controller limit". Determines the maximum voltage increase of the field
current controller. The higher the value, the greater the maximum effect of 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 S P
Setting range
0 … 800 %
Factory setting
{ 150 }
Description The field weakening controller reduces the field setpoint if the synchronous speed is
exceeded. In the basic speed range, the field weakening controller has no function; for
this reason, the field weakening controller only needs to be set if speeds above the
nominal motor speed are set. Excessive values for P318 / P319 cause 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 S P
Setting range
0 … 800 % / ms
Factory setting { 20 }
Description
Only affects the field weakening range, see P318 "Field weakening controller P"