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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.
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.)
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.)
Parameter
Number
Name
Initial
Value
Setting
Range
Description
374 Overspeed detection level 9999
0 to 400Hz
When the motor speed exceeds the speed set in
Pr. 374, overspeed (E.OS) occurs, and the inverter
outputs are stopped.
9999 No function
Operation Panel
Indication
E.OS
FR-PU04
FR-PU07
E.OS
Name
Overspeed occurrence
Description
Stops the inverter outputs when the motor speed exceeds the Pr. 374 Overspeed detection level
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 105%") may
damage the inverter.
REMARKS
·Set Pr. 65 Retry selection = "0" or "4" to perform retry at E.OS occurrence.
ALM
Motor speed
Time
E.OS
Coast to stop
ON
P
r. 374
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