Delta MH300 Series - Page 450

Chapter 12 Description of Parameter Settings
MH300
12.1-06-23
corresponds to 75% of the derating ratio. When the output current is higher than the value,
the carrier frequency will not be reduced by this, but if the overload continues for a long
time, the oH1 fault (IGBT overheating) or oL fault (the inverter is overloaded) will be
triggered due to the IGBT temperature rise, and the motor will eventually stop.
 The oL protection executes when the current is 120% × 75% = 90% for one minute; therefore,
it must operate by the curve to keep the carrier frequency.
 Setting 2:
 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).
 The protection method and action are set to 0, but this disables the current limit when output
current is the derating ratio x 120% of output current in normal load, and derating ratio x
180% of output current in light load.
The advantage: it can provide a higher starting output current (Pr.06-55 = 0) when the carrier
frequency (Pr.00-17) setting is higher than the default value.
The disadvantage: the carrier frequency derates easily when it overloads.
 For example: when Pr.06-55 = 0 or 1, the over-current stall prevention level = Ratio × Pr.06-
03. When Pr.06-55 = 2, the over-current stall prevention level = Pr.06-03.
 Use with the settings for Pr.00-16 and Pr.00-17.
 The ambient temperature also affects the derating; refer to Section 9-6 Derating for Ambient
Temperature, Altitude and Carrier Frequency.
Example:
Take VFD9A0MH43ANSAA in normal duty 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 rated output current. The ambient temperature 60ºC corresponds to 75% * 75% of the rated
output current.

06-56
PT100 Voltage Level 1
Default: 5.000
Settings
0.000–10.000 V

06-57
PT100 Voltage Level 2
Default: 7.000
Settings 0.000–10.000 V
 Condition settings: Pr.06-57 > Pr.06-56.

06-58
PT100 Level 1 Frequency Protection
Default: 0.00
Settings 0.00–599.00 Hz

06-59
PT100 activation level 1 protection frequency delay time
Default: 60
Settings
0–6000 sec.
 PT100 operation instructions