Rockwell Automation RELIANCE ELECTRIC SP500 - Page 75

F-05 Current Limit
This parameter limits Parameter Range: 10% to 150% of rated drive current
motor output torque on °
while it is running or Default Setting: 150%
accelerating. Step Size: 1.0%
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).
F-06 Manual Torque Boost
This parameter sets Parameter Range: 0to 10%
the percentage of a 3
output voltage boost at Default Setting: 2%
zero frequency. Step Size: 1%
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).
S100
<
9
5 50
e
3B 10
Manual Torque Boost {
0
Base Speed Base Speed
2
FREQUENCY (Hz)
Figure 8.1 — Manual Torque Boost Adjustment Range
F-07 V/Hz (Base Speed)
This parameter Parameter Range: 30 to 240 Hz
specifies the base oe
speed at maximum Default Setting: 60 Hz
output voltage and is Step Size: 1.0 Hz
used to establish the
volts/hertz (V/Hz) curve.
Programming Reference 8-7