Delta MH300 Series - Page 449

Chapter 12 Description of Parameter Settings
MH300
12.1-06-22

06-53
Treatment for Phase Loss Protection (OrP)
Default: 0
Settings
0: Fault and ramp to stop
1: Fault and coast to stop
 The drive executes the input phase loss protection according to Pr.06-53.

06-55
Derating Protection
Default: 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 maximum output frequency and the minimum carrier wave limit in control mode:
For VF, SVC, VFPG modes: Maximum operation frequency (Pr.01-00) x 10 minimum sampling
point limit
For FOCPG, FOC Sensorless modes: Maximum operation frequency (Pr.01-00) x 20 minimum
sampling point limit
 Setting 0:
 Actual over-current stall prevention level = derating ratio × over-current stall prevention level
(Pr.06-03 and Pr.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 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 VFD9A0MH43ANSAA normal duty for example: ambient temperature 50°C, UL Open
Type, and independent installation. When the carrier frequency is set to 10 kHz, it
corresponds to 75% of the derating ratio. When the output current is higher than the value,
it automatically decreases the carrier frequency according to the ambient temperature,
output current and overload time. At this time, the over-current stall prevention level is
150%.
 Setting 1:
 Actual over-current stall prevention level = derating ratio × over-current stall prevention level
(Pr.06-03 and Pr.06-04).
 When the operating point is greater than the derating curve 1, 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 VFD9A0MH43ANSAA normal duty for example: ambient temperature 50°C, UL Open
Type, and independent installation. When the carrier frequency is set to 10 kHz, it