ACS 300 User’s Manual 67
Chapter 7 - Drive Parameters
Figure 7-7 DC Hold.
When both reference and output frequency drop below 1.5
Hz, the ACS 300 will stop generating sinusoidal current and
inject DC into the motor. When the reference frequency rises
above 1.5 Hz, the DC will be removed and normal ACS 300
function resumed.
DC Hold has no effect if the Start signal is deactivated.
Note:
Injecting DC current into the motor causes the motor
to heat up. In applications where long DC Hold times are
required, externally ventilated motors should be used. DC
Hold cannot keep the motor shaft totally from rotating if a
load torque is applied to the motor.
PARAM SET
Selecting extended I/O configuration. When you want to use
page 4 parameters, parameter PSET must be set to “2” and
DI5 must be active.
1
Page 4 parameters ignored.
2
Page 4 parameters are used if DI5 is active.
1,5 Hz
t
t
f
motor
Reference f
DC Hold
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