BENSHAW RSi SG Series, Instruction Manual

Page: 119 / 218

Chapter 6 - Parameter Description [AFN]
6-31
AFN-48: Carrier Frequency
Param
LCD
Display
Description
Setting
Range
AFN-48 Carrier freq
Carrier
Frequency
0.7 ~ 15
[kHz]
This parameter sets the switching frequency for the
PWM output. The switching frequency will affect the
audible sound of the motor, electrical interference from
the drive, internal drive termperature, and leakage
current. If the ambient temperature where the drive is
installed is high or other equipment may be affected by
potential electrical interference, set this value lower.
If this paramter is set above 10kHz, reduce the rated
output current by 5% for each 1kHz above 10kHz. Do
not set the carrier frequency below 1.5kHz when AFN-
60 [Control mode selection] is set to Sensorless Vector,
otherwise poor performance can result.
Note: AFN-48 [Carrier freq] setting range varies
with inverter capacity.
AFN-49: PWM Mode Selection
Electrical noise and leakage currents can be reduced by
changing the PWM carrier characteristics without
changing the PWM carrier frequency (AFN-48).
AFN – 49
Setting Range
Description
Normal
Operation via standard Space
Vector PWM pattern. PWM
frequency may be automatically
adjusted at low speed for
optimal performance.
Low Leakage
Space Vector PWM pattern to
reduce leakage currents.
Note: Reducing the PWM carrier frequency may
increase audible motor noise.
Note: The carrier frequency cannot be set below 2.0
kHz if low leakage (default) is selected in AFN-49
.
AFN-52: Decel Rate
AFN-53: Safety Stop Output
These parameters are used in conjunction with FUN-28,
Safety Stop (when active) to control the stopping of the
motor upon a loss of power. The decel rate (secs.)
should be set to the amount of time the motor takes to
coast to a stop under normal conditions. The safety
percentage is the percentage that the output voltage is
decreased when safety stop is activated. For low
inertia loads, increase the percentage to lower the
output voltage. This helps the drive maintain the DC
Bus voltage for a longer period of time.
AFN ► Carrier freq
48 X.X kHz
Factory Default: Model Dependent
AFN ► PWM Select
49 Low Leakage
Factory Default:
Low Leakage
AFN ► Dec Rate
52 100 secs
AFN ► safety_perc
53 21