Mitsubishi Electric FR-F720P-0.75K Instruction Manual page 183

2 Overspeed detection function (Pr. 374)
Inverter outputs are stopped when the motor speed exceeds the Pr. 374 Overspeed detection level under IPM
motor control.
Parameter
Name
Number
374 Overspeed detection level
Selecting the IPM motor control by the parameter setting mode or Pr. 998 IPM parameter initialization changes
the Pr. 374 setting to "maximum motor frequency (motor speed)  105%". (For the details of parameter setting
mode and Pr. 998 IPM parameter initialization, refer to the Instruction Manual.)
When the overspeed fault occurs, the display on the operation panel or parameter unit automatically changes
to the display shown below. (Via communication, the fault code HD0 is output.)
Operation Panel
E.OS
Indication
Name
Overspeed occurrence
Stops the inverter outputs when the motor speed exceeds the Pr. 374 Overspeed detection level
Description
under IPM motor control. This protective function is available while the IPM motor control is
selected.
Check point
· Check that the Pr. 374 Overspeed detection level value is correct.
Corrective action
· Set the Pr. 374 Overspeed detection level value correctly.
CAUTION
 An E.OS activation at a high frequency setting (a frequency higher than "maximum motor speed
damage the inverter.
REMARKS
Pr. 65 Retry selection
· Set
3 Compatibility with the plug-in option FR-A7NCE
Compatibility with the FR-A7NCE plug-in option is added. FR-A7NCE enables communication via CC-Link IE
Field Network. (For the details , refer to the Instruction Manual of FR-A7NCE.)
Initial Setting
Value Range
0 to 400Hz
9999
Motor speed
Pr. 374
ALM
= "0" or "4" to perform retry at E.OS occurrence.
When the motor speed exceeds the speed set in
Pr. 374
, overspeed (E.OS) occurs, and the inverter
outputs are stopped.
9999 No function
Coast to stop
Time
ON
E.OS
FR-PU04
E.OS
FR-PU07
2/2
Description

105%") may
BCN-C22005-620