50 ACS 300 User’s Manual
Chapter 7 - Drive Parameters
100 Hz/1800 s. The time required for acceleration from zero
to minimum frequency depends on ACC 1.
When the selected I/O mode is Standard or Alternate, DI5
selects ACC/DEC 1 or 2. 0 V = ramp 1 and +24 V = ramp 2.
Refer to page 25 for a detailed explanation of I/O modes.
Note! The ACS 300 incorporates a controller that prevents
over current and overvoltage trips caused by too rapid
acceleration and deceleration settings for a given system,
by slowing down the acceleration/deceleration.
If a short time is entered for acceleration time in a system
with high inertia, the acceleration time will be limited by the I
LIMIT parameter. Conversely, if a short time is entered for
deceleration time in such a system, the deceleration time
will be limited by the DC link bus regulator. In some cases,
the motor will take a long time to come to a stop. If the sys-
tem inertia is high, an OVERVOLTAGE fault may occur if the
deceleration time is too short. The ACS 300 can deliver
about 15 % braking torque without an external braking resis-
tor. If a short deceleration time is critical to your system, we
suggest you add a dynamic braking resistor to your system.
Brake Resistor is available as an option for all frame sizes.
Chopper is available as an option for frame size R2.
If the reference signal changes at a slower rate than the
acceleration or deceleration time, the output frequency
change will follow the reference signal. If the reference sig-
nal changes faster than the acceleration or deceleration
time, the output frequency change will be limited by the
parameters.
FAULT MEMORY
The ACS 300 continuously monitors itself for faulty opera-
tion. The last three faults are stored on Page 1 parameter
FAULT MEMORY. Refer to “Chapter 8 - Fault Tracing” on
page 71
,
for further information on fault memory.
NOM RPM
Nominal motor rpm from the motor rating plate.
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