Delta Electronics VFD037CH23A-21 — настройки параметров для защиты от перегрузки и потерь фазы [335/638]

Превью страниц Страница 335 / 638

Chapter 12 Description of Parameter SettingsCH2000 Series

119

12-

Treatment for the detected Input Phase Loss （OrP）

Factory Setting: 0

Settings 0: warn, ramp to stop

1: warn, coast to stop

 Over ripple protection

 When the DC BUS ripple is bigger than protection level, drive will trip up OrP and depending on

how the parameter 06-53 is set to stop.

Reserved

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

 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 VFD007CH43A in super

heavy duty as example, surrounding temperature 50℃ 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 VFD007CH43A in super 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 normal 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.