Chapter 12 Descriptions of Parameter SettingsC2000 Plus
12.1-06-25
FOCPG, IMFOC Sensorless, and IPM Sensorless: Maximum operation frequency (Pr.01-00)
× 20 minimum sampling point limit.
Example: Maximum operation frequency (Pr.01-00) is 400 Hz, the minimum sampling point
limit of VF, SVC, VFPG, and PM Sensorless is 4 kHz (=400 Hz × 10). The minimum
sampling point limit of FOCPG, IMFOC Sensorless, and IPM Sensorless is 8kHz (=400 Hz
× 20).
Refer to Section 9-7 Derating for Ambient Temperature, Altitude and Carrier Frequency for the
derating ratio.
Setting 0:
Actual over-current stall prevention level = derating ratio × over-current stall prevention level
(Pr.06-03 and 06-04)
Rated current derating level: derating ratio × rated current (Pr.00-01)
When the operating point is greater than the derating curve, the carrier frequency (Fc) output
by the drive decreases automatically according to the ambient temperature, overload output
current and overload time.
Applicable conditions: If overloads are not frequent, and the concern is only about the carrier
frequency operating with the rated current for a long time, and changes to the carrier wave
due to short overload are acceptable, set to 0.
Take VFD007C43A-21 Heavy Duty for example: ambient temperature 50ºC, UL Open Type,
and independent installation. When the carrier frequency is set to 15 kHz, it corresponds to
72% of the derating ratio. When the output current is higher than this value, it automatically
decreases the carrier frequency according to the ambient temperature, output current and
overload time (for example: set Pr.06-03 to 200%). At this time, the over-current stall
prevention level is 144% (=72% × 200%) of the rated current (Pr.00-01).
Setting 1:
Actual over-current stall prevention level = derating ratio × over-current stall prevention level
(Pr.06-03 and 06-04)
When the operating point is greater than the derating curve, the carrier frequency (Fc) output
by the drive is fixed to the default value.
Applicable conditions: Select this mode if the change of carrier frequency and motor noise
caused by ambient temperature and frequent overload are not acceptable. Refer to Pr.00-
17.
Take VFD007C43A-21 Heavy Duty for example: ambient temperature 50ºC, UL Open Type,
and independent installation. When the carrier frequency is set to 15 kHz, it corresponds to
72% of the derating ratio. When the output current is higher than this value, the carrier
frequency unchanged. However, if the overload continues for a long time, the oH1 fault
(IGBT overheating) or oL fault (the drive overload) will be triggered due to the IGBT
temperature rise, and the drive will eventually stop.
Setting 2:
Actual over-current stall prevention level = over-current stall prevention level (Pr.06-03 and
06-04)
Rated current derating level: derating ratio × rated current (Pr.00-01)