ACS 300 User’s Manual 61
Chapter 7 - Drive Parameters
Figure 7-5 illustrates the effect of IR compensation. Extra
voltage is applied to the motor as shown. Voltage “a” is the
IR compensation voltage. Frequency “b” is the nominal
motor frequency (NOM FREQ). Voltage c is the nominal
motor voltage (U
N
).
Figure 7-5 IR Compensation.
DC BRAKE
When the STOP parameter is set to DC BRAKE or
DEC+HOLD, this parameter sets the DC injection time in
seconds. If the braking time is too short, the drive stops by
coasting after the DC braking time has elapsed.
Note:
Injecting DC current into the motor causes the motor
to heat up. In applications where long DC BRAKE/
DEC+HOLD times are required, externally ventilated motors
should be used.
U/f RATIO
The voltage to frequency ratio in the frequency range 0 Hz
to nominal motor frequency can be set either LINEAR,
SQUARE or OPTIM.
c
a
b
{
f [Hz]
U [V]
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