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2/2 BCN-C22005-632
2 MM-EFS rated current change
The rated motor current has been changed for the MM-EFS 1.5kW to 3.7kW (200V/400V) premium high-efficiency
IPM motors. As a result, the rated motor current automatically set in Pr.998 IPM parameter initialization is changed as
shown below.
<Before>
<After>
Operation Panel
Indication
E.OV2
FR-PU04
FR-PU07
Stedy Spd OV
Name
Regenerative overvoltage trip during constant speed
Description
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the
specified value, the protective circuit is activated to stop the inverter output. The circuit may also be
activated by a surge voltage produced in the power supply system.
Check point
· Check for sudden load change.
· Check if Pr.22 Stall prevention operation level is set too low like the no-load current.
Check if the stall prevention operation is frequently activated in an application with a large
load inertia.
Corrective action
· Keep load stable.
· Use the regeneration avoidance function (Pr. 882 to Pr. 886). ( Refer to Chapter 4 of the Instruction
Manual (Applied).)
· Use the brake unit or power regeneration common converter (FR-CV) as required.
· Set a value larger than the no load current in Pr. 22 Stall prevention operation level.
Set Pr.154 Voltage reduction selection during stall prevention operation = "10 or 11". ( Refer to
Chapter 4 of the Instruction Manual (Applied).)
Operation Panel
Indication
E.OV3
FR-PU04
FR-PU07
OV During Dec
Name
Regenerative overvoltage trip during deceleration or stop
Description
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the
specified value, the protective circuit is activated to stop the inverter output. The circuit may also be
activated by a surge voltage produced in the power supply system.
Check point
· Check for sudden speed reduction.
Check if the stall prevention operation is frequently activated in an application with a large
load inertia.
Corrective action
· Increase the deceleration time. (Set the deceleration time which matches the moment of inertia of the
load)
· Longer the brake cycle.
· Use the regeneration avoidance function (Pr. 882 to Pr. 886). ( Refer to Chapter 4 of the Instruction
Manual (Applied).)
· Use the brake unit or power regeneration common converter (FR-CV) as required.
Set Pr.154 Voltage reduction selection during stall prevention operation = "10 or 11". ( Refer to
Chapter 4 of the Instruction Manual (Applied).)
Motor model
MM-EFS1M
7 15 22 37 55 75 11K 15K 18K 22K 30K 37K 45K 55K
MM-EFS1M4
Compatible
inverter
FR-F720P-K
0.75 1.5 2.2 3.7 5.5 7.5 11 15 18.5 22 30 37 45 55
FR-F740P-K
Rated current
(A)
200V class 3 5.6 8 13 20 27 40 54 66 79 110 128 157 194
400V class 1.5 2.8 4 6.5 10 13.5 20 27 33 39.5 55 64 78.5 97
Motor model
MM-EFS1M
7 15 22 37 55 75 11K 15K 18K 22K 30K 37K 45K 55K
MM-EFS1M4
Compatible
inverter
FR-F720P-K
0.75 1.5 2.2 3.7 5.5 7.5 11 15 18.5 22 30 37 45 55
FR-F740P-K
Rated current
(A)
200V class 3 6.0 8.2 13.4 20 27 40 54 66 79 110 128 157 194
400V class 1.5 3.0 4.1 6.7 10 13.5 20 27 33 39.5 55 64 78.5 97
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