Omron SYSDRIVE MX2 SERIES User Manual

5-114
5-9 Functions Relating to Protections, Warnings and Various Output Signals
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
5
Functions
Overload Limit/Overload Warning
Overload Limit
The Inverter monitors the motor current during acceleration or constant speed operation and
lowers output frequency automatically when the motor current reaches to the overload limit
level.
This function prevents an overcurrent trip caused by excessive moment of inertia during
acceleration, or caused by sporadic load fluctuations during constant speed operation.
You can set 2 types of overload limit functions in b021/b022/b023 and b024/b025/b026.
To switch between b021/b022/b023 and b024/b025/b026, allocate "39: OLR" to a multi-
function input terminal and then turn it ON/OFF.
The overload limit level sets a current value for this function to work.
The overload limit parameter sets a time of deceleration from the maximum frequency to 0 Hz.
When this function operates while the Inverter is accelerating, the acceleration time becomes
longer than the set time.
When the selected control method is sensorless vector control and "03: Enabled during
acceleration/constant speed (accelerated during regeneration)" is selected for b021/b024, the
frequency will increase if current exceeding the overload limit level flows during regeneration
operation.
If the setting of Overload Limit Parameter b023/b026 is too small, an overvoltage trip may
occur because of regenerative energy from the motor even during acceleration. This is due to
automatic deceleration under this function.
Make the following adjustments if this function operates during acceleration and the frequency
doesn't reach the target level.
 Increase the acceleration time (refer to "Acceleration/Deceleration Time" on page 5-24).
 Increase the overload limit level (b022/b025).
Parameter
No.
Function name Data
Default
setting
Unit
b021/b024
b221
Overload Limit 1
Selection/
Overload Limit 1
Selection 2
Overload Limit 2
Selection
00: Disabled
01 −
01: Enabled in acceleration/constant
speed operation
02: Enabled in constant speed
operation
03: Enabled during acceleration/
constant speed (accelerated during
regeneration)
b022/b025
b222
Overload Limit 1 Level/
Overload Limit 1 Level 2
Overload Limit 2 Level
Current value at which the overload
limit actuates
Heavy load (b049 = 00):
0.20 × Rated current to 2.0 × Rated
current
Light load (b049 = 01):
0.20 × Rated current to 1.5 × Rated
current
Heavy
load: Rated
current
×
1.50
Light load:
Rated
current
×
1.20
A
b023/b026
b223
Overload Limit 1 Parameter/
Overload Limit 1 Parameter 2
Overload 2 Limit Parameter
0.1 to 3000.
Deceleration time at which the
overload limit actuates
1.0 s
C001 to C007
Multi-function Input
Selection
39: OLR (Overload limit switching)
−−

Omron SYSDRIVE MX2 SERIES Specifications

General

Brand	Omron
Model	SYSDRIVE MX2 SERIES
Category	Inverter
Language	English