Delta MH300 Series - Page 344

Chapter 12 Descriptions of Parameter Settings
MH300
12.1-00-19
00-16
Duty Selection
Default: 1
Settings
0: Normal duty
1: Heavy duty
 Normal duty: over-load rated output current 150% in 3 seconds (120%, 1 minute).
Refer to Pr.00-17 for the setting for the carrier wave. Refer to Pr.00-01 or the specification table
for the rated current.
 Heavy duty: over-load rated output current 200% in 3 seconds (150%, 1 minute).
Refer to Pr.00-17 for the setting for the carrier wave. Refer to Pr.00-01 or the specification table
for the rated current.
 Pr.00-01 varies with the setting value for Pr.00-16. The default value and maximum for Pr.06-03
and Pr.06-04 also vary with the setting value of Pr.00-16.
 In Normal Duty, the default setting of Pr.06-03 and Pr.06-04 is 120%, and the maximum is 150%.
However, if DC voltage is higher than 700 V
DC
(460V models) or 350 V
DC
(230V models), then
the maximum is 145%.
 In Heavy Duty, the default setting of Pr.06-03 and Pr.06-04 is 180%, and the maximum is 200%.
However, if DC voltage is higher than 700 V
DC
(460V models) or 350 V
DC
(230V models), then
the maximum is 165%.
00-17
Carrier Frequency
Default: 4 / 4
Settings Normal load: 2–15 KHz
Heavy load: 2–15 KHz
NOTE:
When Pr.00-11 = 5 (IMFOC Sensorless), the maximum carrier frequency is 14 kHz.
 This parameter determines the PWM carrier frequency for the AC motor drive.
Models
115V / 230V
460V
0.25–15 HP
(0.2–11 kW)
20–30 HP
(15–37 kW)
0.5–20 HP
(0.4–15 kW)
25–75 HP
(18.5–100 kW)
Settings Range
2–15 kHz
Default - Normal Duty
4 kHz
Default - Heavy Duty
4 kHz
 From the above table, the PWM carrier frequency has significant influences on the
electromagnetic noise, the AC motor drive heat dissipation, and the motor acoustic noise.
Therefore, if the surrounding noise is greater than the motor noise, lower the carrier frequency
to reduce the temperature rise. Although the motor has quiet operation in the higher carrier
frequency, consider the entire wiring and interference.
 When the carrier frequency is higher than the default, decrease the carrier frequency to protect
the drive. Refer to Pr.06-55 for related setting and details.