Honeywell VFD CORE - Page 188

CHAPTER 12: DESCRIPTION OF PARAMETER SETTINGS
63-4528—04 188
• Setting 0: When the rated current is constant, carrier frequency (Fc) outputted by PWM will auto decrease according to
surrounding temperature, overload output current and time. If overload situation is not frequent and only cares the carrier
frequency operated with the rated current for a long time and carrier wave changes during short overload, it is recommended
to set to 0.
Refer to the following diagram for the level of carrier frequency. Take VFD in heavy duty as example, surrounding temperature
50
o
C with independent installation and UL open-type. When the carrier frequency is set to 15kHz, it corresponds to 72% rated
output current. When it outputs higher than the value, it will auto decrease the carrier frequency. If the output is 83% rated
current and the carrier frequency will decrease to 12kHz. In addition, it will also decrease the carrier frequency when overload.
When the carrier frequency is 15kHz and the current is 120%*72%=86% for a minute, the carrier frequency will decrease to
the factory setting.
• Setting 1: It is used for the fixed carrier frequency and prevents the carrier wave changes and motor noise caused by the
surrounding temperature and frequent overload.
Refer to the following for the derating level of rated current. Take VFD in heavy duty as example, when the carrier frequency
keeps in 15kHz and the rated current is decreased to 72%, it will have OL protection when the current is 120%*72%=86% for
a minute. Therefore, it needs to operate by the curve to keep the carrier frequency.
• Setting 2: It sets the protection method and action to 0 and disables the current limit for the Ratio*160% of output current in
the heavy duty and Ratio*180% of output current in the heavy duty. The advantage is that it can provide higher output current
when the setting is higher than the factory setting of carrier frequency. The disadvantage is that it decreases carrier wave
easily when overload.
Derating Curve diagram while Normal duty and Heavy duty: 460V & 230V
06 - 46 Derating Protection
Factory Setting: 1
Settings 0: constant rated current and limit carrier wave by load current and temperature
1: constant carrier frequency and limit load current by setting carrier wave
2: constant rated current (same as setting 0), but close current limit
SETTING 1
NORMAL DUTY
(40 : UL OPEN TYPE AND TYPE 1)
HEAVY DUTY
(50 : UL OPEN TYPE)
(40 : UL TYPE 1 AND OPEN TYPE_SIZE BY SIZE)
460V
4
Fc (kHz)
RATIO
(%)
56789101112131415
110
100
90
80
70
60
01
02
03
VFD CORE 1 HP - 25 HP, 460 VOLTAGE
VFD CORE 30 HP - 100 HP, 460 VOLTAGE
VFD CORE 125 HP, 460 VOLTAGE
03
02
01
M33676
4
Fc (kHz)
56789101112131415
110
100
90
80
70
60
SETTING 0 OR 2
NORMAL DUTY
(30 : UL OPEN TYPE AND TYPE 1)
HEAVY DUTY
(40 : UL OPEN TYPE)
(30 : UL TYPE 1 OR OPEN TYPE_SIZE BY SIZE)
460V
01
02
03
VFD CORE 1 HP - 25 HP, 460 VOLTAGE
VFD CORE 30 HP - 100 HP , 460 VOLTAGE
VFD CORE 125 HP, 460 VOLTAGE
03
02
01
RATIO
(%)