Vacon 20 CP/X, Applications Manual

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Parameter description vacon • 62
Service support: find your nearest Vacon service center at www.vacon.com
4
P8.12 DC
BRAKING TIME AT STOP
Time for DC current injection at stop.
P8.13 F
REQUENCY TO START
DC
BRAKING IN RAMP STOP
DC current injection starts below this frequency.
P8.14 DC
BRAKING TIME AT START
Time for DC current injection at start.
P8.15 M
OTOR STATOR VOLTAGE DROP
Voltage drop on stator windings, at motor nominal current, defined as% of nominal voltage.
Value affects motor torque estimation, slip compensation and voltage boost.
Note: it is suggested not to program manually the value, but to perform motor identification
procedure that automatically sets the value.
P8.16 M
OTOR IDENTIFICATION
This procedure measures motor stator resistance and automatically sets U/f characteristic, to
obtain good torque also at low speed.
0 = not active
1 = standstill identification
Run command must be given and hold high within 20s after programming the value 1. The mo-
tor does not rotate and the drive will automatically exit run state at the end of the measure-
ments.
Note : the drive exits run state only, if the measured current exceeds 55% of the motor nominal
current. Procedure sets the following parameters: P8.4, P8.5, P8.6, P8.7, P8.15.
Note : optimized U/f settings will increase motor no load current to a value close to nominal in
the low speed range. External cooling of the motor is needed if the motor works in this condi-
tion for significant time.
P8.18 D
ISABLE UNDERVOLTAGE REGULATOR
Undervoltage regulator automatically decelerates the motor if the internal DC link voltage is
too low.
0: enabled
1: disabled
P8.19 D
ISABLE SWITCHING FREQ
.
REGULATOR
Switching frequency regulator automatically decreases the PWM frequency if the unit temper-
ature is too high.
0: enabled
1: disabled