Delta VFD11AMS21AFSHA, User Manual

Page: 245 / 445

Chapter 12 Description of Parameter Settings

MS300 (High Speed Model)
12-06-18

LvX Auto Reset
Factory Setting: 0
Settings 0: Disable
1: Enable
 Pr. 06-49=0: Disable; LvA, Lvd, Lvn error will be record and need to be reset.

Pr. 06-49=1: Enable; LvA, Lvd, Lvn error will be record. The DC-BUS voltage has reach Lv reset
level and the Soft-start Relay has turn ON, the Lvx error will be reset automatically.

Treatment for the Detected Input Phase Loss (OrP)
Factory Setting: 0
Settings 0: Warn and ramp to stop
1: Warn and coast to stop
 Drive executes input phase loss protection according to Pr. 06-53.

Derating Protection
Factory Setting: 0
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
 Allowable max. output frequency and the min. carrier wave limit in control mode:
VF: When max. output frequency is 1500.0 Hz, the min. carrier wave is 6 k.
 Setting 0:
When the operating point is greater than the derating curve (when the operating carrier
wave is greater than the rated carrier wave), the rated current is constant, and carrier frequency
(Fc) outputted by the drive will auto decrease according to ambient temperature, overload
output current and overload time. If overload situation is not frequent and only cares the carrier
frequency operated with the rated current for a long time, and can accept the change of carrier
wave due to short overload, it is recommended to set to 0. Refer to the following derating curve
for the level of carrier frequency.
For example: ambient temperature 50 °C, UL open-type, and independent installation.
When the carrier frequency is set to 12 kHz, corresponding to 65 % rated output current. (Refer
to the following derating curve)
When output current is higher than the value, it will auto
decrease the carrier wave according to ambient temperature, output current and overload time.
If the output current is 85 % of rated current, the carrier will be reduced to 8 kHz, therefore
the current must operate in 65 % of rated current to maintain the carrier at 12 kHz. Overload will
also reduce the carrier. For example: the carrier is 12 kHz, the current overload capacity is
150 % * 65 % of rated current for 1 minute, if the current is over 150 % * 65 % of rated current, it
will automatically reduce the carrier according to the current and the length of overload time and
other information. The minimum reduce to preset carrier 8 kHz. In addition, the overcurrent stall
prevention function Pr. 06-03 and Pr. 06-04 still retain the current limit for the derating ratio*set
value of Pr. 06-03 and Pr. 06-04.