Rockwell Automation SP500 AC Drive Installation and Operation Manual - Manual (Page 79)

Programming Reference 8-7
When output current attempts to exceed the preset current limit, motor current will be
maintained or reduced, or the acceleration / deceleration time will be extended. If
current limit is set too low or too high relative to the required load, an overcurrent fault
may occur (OC will be displayed).
Torque boost offsets the voltage drop of the AC motor at low speeds. For high friction
loads or high inertia loads, a high starting torque level may be needed. Manual torque
boost is only effective at speeds lower than one-half of the motor’s base frequency.
See figure 8.1.
When adjusting this parameter, start with the default setting of 2% and gradually
increase the value until motor operation is satisfactory. If torque boost is set too high
relative to the load and acceleration rate, an overcurrent fault may occur (OC will be
displayed).
F-05 Current Limit
This parameter limits
motor output torque
while it is running or
accelerating. Parameter Range:
Default Setting:
Step Size:
10% to 150% of rated drive current
150%
1.0%
F-06 Manual Torque Boost
This parameter sets
the percentage of
output voltage boost at
zero frequency. Parameter Range:
Default Setting:
Step Size:
0 to 10%
2%
1%
Figure 8.1 – Manual Torque Boost Adjustment Range
Base Speed Base Speed
2
FREQUENCY (Hz)
Manual Torque Boost
0
10
50
100
OUT
P
UT
V
OL
T
A
GE
(%
)
F-07 V/Hz (Base Speed)
This parameter
specifies the base
speed at maximum
output voltage and is
used to establish the
volts/hertz (V/Hz) curve. Parameter Range:
Default Setting:
Step Size:
30 to 240 Hz
60 Hz
1.0 Hz