Chapter 12 Description of Parameter Settings
MH300
2. Pr.06-13 or Pr.06-27 set to 1 (using standard motor):
When the output current of the drive is higher than 150% of the motor rated current (refer to
the motor cooling curve with shaft-fixed fan), the drive starts to count the time. The electronic
thermal relay acts when the accumulated time exceeds Pr.06-14 or Pr.06-28.
The actual electronic thermal relay action time adjusts according to the drive output current
(shown as the motor loading rate %). The action time is short when the current is high, and the
action time is long when the current is low. Refer to the following chart: (The motor cooling curve
with shaft-fixed fan and motor cooling curve with independent fan F = 50 Hz are the same one.)
Temperature Level Ove-rheat (OH) Warning
Default: Depending on the
model power
Settings
0.0–110.0 ºC
Sets the drive’s internal IGBT overheat warning level. When the temperature is higher than
Pr.06-15 setting, the oH1 fault displays and the warning remains but it does not affect the drive
operation.
Use this parameter to check the motor overheat in advance in order to take
precautionary
measures to decrease the temperature and maintain the motor’s normal operation.
If you set the temperature 5ºC higher than the maximum setting value for Pr.06-15, IGBT
overheating occurs and the drive stops. Refer to Chapter 14 oH1 fault descriptions for details.
06-16
Stall Prevention Limit Level
(Weak Magnetic Area Current Stall Prevention Level)
Default: 100
Settings 0–100% (Refer to Pr.06-03, Pr.06-04)
This parameter only works in VF, VFPG, and SVC control modes.
Sets the over-current stall prevention level when the motor’s operation frequency is larger than
Pr.01-01 (base frequency).
Example: When Pr.06-03 = 150%, Pr.06-04 = 100% and Pr.06-16 = 80%.
When the motor’s operation frequency is larger than Pr.01-01 (Motor 1 rated / base frequency),
the lowest level of over-current stall prevention during acceleration is:
Pr.06-03 x Pr.06-16 = 150 x 80% = 120%. (Refer to Pr.06-03 diagram for the protection curve)
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