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Mitsubishi Electric FR-F720P-0.75K Instruction Manual Page 185

Fr-f700p series.
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Operation Panel
Indication
Name
Regenerative overvoltage trip during constant speed
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the
Description
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 for sudden load change.
· Check if Pr.22 Stall prevention operation level is set too low like the no-load current.
Check point
 Check if the stall prevention operation is frequently activated in an application with a large
· Keep load stable.
· Use the regeneration avoidance function (Pr. 882 to Pr. 886). (
Corrective action
· 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". (
Operation Panel
Indication
Name
Regenerative overvoltage trip during deceleration or stop
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the
Description
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 for sudden speed reduction.
Check point
 Check if the stall prevention operation is frequently activated in an application with a large
· Increase the deceleration time. (Set the deceleration time which matches the moment of inertia of the
· Longer the brake cycle.
· Use the regeneration avoidance function (Pr. 882 to Pr. 886). (
Corrective action
· 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". (
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>
MM-EFS1M
Motor model
MM-EFS1M4
Compatible
FR-F720P-K
FR-F740P-K
inverter
Rated current
200V class
400V class
(A)
<After>
MM-EFS1M
Motor model
MM-EFS1M4
Compatible
FR-F720P-K
FR-F740P-K
inverter
Rated current
200V class
400V class
(A)
E.OV2
load inertia.
Manual (Applied).)
Chapter 4 of the Instruction Manual (Applied).)
E.OV3
load inertia.
load)
Manual (Applied).)
Chapter 4 of the Instruction Manual (Applied).)
7
15
22
0.75
1.5
2.2
3
5.6
8
1.5
2.8
4
7
15
22
0.75
1.5
2.2
3
6.0
8.2
13.4
1.5
3.0
4.1
FR-PU04
Stedy Spd OV
FR-PU07
FR-PU04
OV During Dec
FR-PU07
37
55
75
11K
15K
3.7
5.5
7.5
11
15
13
20
27
40
54
6.5
10
13.5
20
27
37
55
75
11K
15K
3.7
5.5
7.5
11
15
20
27
40
54
6.7
10
13.5
20
27
2/2
Refer to Chapter 4 of the Instruction
Refer to
Refer to Chapter 4 of the Instruction
Refer to
18K
22K
30K
37K
45K
18.5
22
30
37
45
66
79
110
128
157
33
39.5
55
64
78.5
18K
22K
30K
37K
45K
18.5
22
30
37
45
66
79
110
128
157
33
39.5
55
64
78.5
BCN-C22005-632
55K
55
194
97
55K
55
194
97

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