Delta MS300 Series User Manual page 385

Chapter 12 Descriptions of Parameter SettingsMS300
 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 VFD9A0MS43ANSAA normal load for example: ambient temperature 50ºC, 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 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 = derating ratio × over-current stall prevention
level (Pr.06-03 and 06-04).
Rated current derating level: derating ratio × rated current (Pr.00-01).

 The protection method and action are set to 0, it disables the current limit when output
current is the derating ratio ×120% (default value) in normal load and when the output
current is the derating ratio ×180% (default value) in heavy load. The advantage is that it
provides a higher starting output current when the carrier frequency setting is higher than
the default. However, the carrier frequency derates easily when it overloads.
 Example: when Pr.06-55 = 0 or 1, over-current stall prevention level = Ratio × Pr.06-03.
When Pr.06-55 = 2, the over-current stall prevention level = Pr.06-03.
 Use this parameter with Pr.00-16 and Pr.00-17.
 The ambient temperature also affects the derating. Refer to Section 9-7-1 Derating Curve for
Ambient Temperature and Altitude.
Take VFD9A0MS43ANSAA normal load for example: ambient temperature 50°C, UL open-type,
and independent installation. When the carrier frequency is set to 10 kHz, it corresponds to 55%
of the rated output current. If used for ambient temperature 60°C, it corresponds to 55% × 75%
of the rated output current.
06-56
PT100 Voltage Level 1

Settings
06-57
PT100 Voltage Level 2

Settings
 Condition settings: PT100 voltage level Pr.06-57 > Pr.06-56.
06-58
PT100 Level 1 Frequency Protection

Settings
06-59
PT100 Activation Level 1 Protection Frequency Delay Time

Settings
0.000–10.000 V
0.000–10.000 V
0.00–599.00 Hz
0–6000 sec.
376
Default: 5.000
Default: 7.000
Default: 0.00
Default: 60