Chapter 4: AC Drive Parameters
Page 4–143
DURApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Type Hex Addr Dec Addr
P6.33 Drive Derating Method
R/W 0621 41570
Range/Units (Format: 16-bit binary) Default
0: Constant rated current (reduce carrier frequency)
1: Constant carrier frequency (limit load current)
2: Constant rated current (same as setting 0, but with higher current limit)
0
Setting 0: Constant rated current
The rated current is constant, the PWM carrier frequency (F
c
) output of the GS4 drive will auto
decrease according to temperature, overload output current, and time. If an overload situation is
not frequent and a constant carrier frequency is not a must, then setting 0 is the best option. The
main drawback to reducing the carrier frequency is that you may hear some audible noise in the
motor. The carrier frequency will change only during short overload situations in order to try to
mitigate the overload current. The OL time at any point along the curve is for 1 minute.
Example 1:
Refer to the following diagram for the auto carrier frequency level at various current levels.
•
GS4-41P0 drive wired 460V set for normal duty, surrounding temperature 50°C with independent
installation and UL open-type�
•
Motor rated current (P0�01) = 100% of drive rated current�
When the carrier frequency is set to 15kHz, it corresponds to 72% rated output current. When
current demand is higher the carrier frequency will automatically decrease to the frequency
required in order to supply current demand. If the current demand increases to 83% rated current
then the carrier frequency will auto-decrease to 12kHz. This setting will also auto decrease the
carrier frequency during an overload condition.
% of P0.01
F
c
(kHz)
460V Normal Duty & Light Duty
110
105
100
95
90
85
80
75
70
65
60
% of P0.01
F
(kHz)
230V Normal Duty & Light Duty
GS4-41P0
GS4-4125
GS4-4030
GS4-21P0
GS4-2075
GS4-2025
4 5 6 7 8 9 10 11 12 13 14 15
4 5 6 7 8 9 10 11 12 13 14 15
110
105
100
95
90
85
80
75
70
65
60
Example 2:
•
Max motor rated current (P0�01) is 120% of the drive’s rated current�
•
Carrier frequency is 15kHz�
The current is limited to (120%)(72%) = 86% of the drive’s rated current for one minute. After one
minute the carrier frequency will decrease to the factory setting of 4kHz.
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