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7 Other Functions
7 - 76
Multi-function Compact Inverter 3G3MX2-V1 User’s Manual (I585-E1)
The inverter monitors the motor current during acceleration or constant speed operation and, if the set
overload limit level is reached, decreases the output frequency automatically according to the overload
limit parameter.
This function is useful to prevent the occurrence of an overcurrent trip due to an excessive torque dur-
ing acceleration or rapid load fluctuations during constant speed operation.
By using two sets of parameters b021/b022/b023 and b024/b025/b026, you can configure two overload
limit function settings.
To switch between the parameter sets b021/b022/b023 and b024/b025/b026, set the Multi-function
Input S1 to S7 Selection (C001 to C007) to 39 (OLR) and turn ON/OFF the terminal to which the OLR
function is allocated.
In the Overload Limit Level (b022/b025/b222), set the current value at which you want to activate this
function.
In the Overload Limit Parameter (b023/b026/b223), set the deceleration time from the maximum fre-
quency to 0 Hz.
When this function is enabled when the inverter is accelerating, the acceleration time will be longer than
the set time.
When sensorless vector control is selected as the control method and, at the same time, b021/b024 is
set to 03 (Enabled during acceleration/constant speed (Accelerated during regeneration)), the fre-
quency will increase if such a large current that exceeds the set Overload Limit Level flows during
regenerative operation.
Because this function causes automatic deceleration even during acceleration, if the value set in the
Overload Limit Parameter (b023/b026/b223) is too small, an overvoltage trip may occur due to the
regenerative energy from the motor.
If this function is activated during acceleration to prevent the target frequency from being attained,
make the following adjustments.
• Increase the acceleration time. (Refer to
5-6 Acceleration/Deceleration Time Settings
on page 5-33.)
• Increase the Overload Limit Level (b022/b025/b222).
7-8-4
Overload Limit/Overload Warning
Overload Limit
Parameter
No.
Function name
Data
Default data
Unit
b021/b024
b221
1st Overload Limit Selection/
1st Overload Limit Selection
2
2nd Overload Limit Selec-
tion
00:
Disabled
01
−
01:
Enabled during acceleration/con-
stant speed
02:
Enabled during constant speed
03:
Enabled during acceleration /con-
stant speed (Accelerated during
regeneration)
b022/b025
b222
1st Overload Limit Level/
1st Overload Limit Level 2
2nd Overload Limit Level
Set the current value at which you want
to activate this function.
Heavy load mode (b049 = 00):
0.20
×
Rated current to 2.00
×
Rated
current
Light load mode (b049 = 01):
0.20
×
Rated current to 1.50
×
Rated
current
Heavy load
mode: Rated
current
×
1.50
Light load
mode: Rated
current
×
1.20
A
Summary of Contents for SYSDRIVE MX2 SERIES
Page 1: ...Multi function Compact Inverter MX2 Series Type V1 User s Manual I585 E1 01 3G3MX2 A V1 ...
Page 32: ...CONTENTS 29 Multi function Compact Inverter 3G3MX2 V1 User s Manual I585 E1 ...
Page 108: ...2 Design 2 48 Multi function Compact Inverter 3G3MX2 V1 User s Manual I585 E1 ...
Page 176: ...4 Parameter List 4 42 Multi function Compact Inverter 3G3MX2 V1 User s Manual I585 E1 ...
Page 538: ...10 Troubleshooting 10 22 Multi function Compact Inverter 3G3MX2 V1 User s Manual I585 E1 ...
Page 598: ...12 Options 12 50 Multi function Compact Inverter 3G3MX2 V1 User s Manual I585 E1 ...
Page 614: ...Appendices A 16 Multi function Compact Inverter 3G3MX2 V1 User s Manual I585 E1 ...
Page 615: ...I 1 Multi function Compact Inverter 3G3MX2 V1 User s Manual I585 E1 I Index ...