62 ACS 300 User’s Manual
Chapter 7 - Drive Parameters
LINEAR
The voltage of the motor changes linearly with frequency in
the constant flux range. Linear U/f (V/Hz) ratio is normally
used in constant torque applications, or where the torque
characteristics of the load are linear with speed.
SQUARE
Squared U/f (V/Hz) ratio is normally used in applications
where the torque characteristic of the load is proportional to
the square of the speed, such as centrifugal pump or fan
systems.
OPTIM
The motor voltage is automatically controlled to minimize
motor losses and noise. This setting is suitable for a drive
which has slowly changing load torque and a motor which
operates mainly below nominal load.
Note! Parameter MOTOR I must be set correctly for best
results.
Note! OPTIM cannot be used in a system where two or
more motors are connected in parallel to one ACS 300.
RESTART #
Number of times the ACS 300 will automatically reset the
fault and restart after any of the following faults: Undervolt-
age, Overvoltage, Overcurrent, Low AI-Signal, Unit Fault.
For further information on fault tracing refer to “Chapter 8 -
Fault Tracing” on page 71. If you select OFF, the automatic
fault reset system is not in operation.
TEMP LIM
The ACS 300 motor thermal protection (sometimes called I
2
t
or solid state overload protection) is activated by using the
TEMP LIM parameter. When set to OFF, the motor overload
protection is deactivated. The TEMP LIM and MOTOR I
parameters define the continuous safe operating area for
the motor, as illustrated in Figure 7-6.
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