Forced Operator; Overload Limit Switching - Omron 3G3MX2 User Manual

Using Intelligent Input Terminals

4-5-11 Forced Operator

4-5-12 Overload Limit Switching

214
This function permits a digital operator interface to override the following two
settings in the inverter:

• - Frequency reference selection

• - RUN command selection
When using the [OPE] terminal input, typically
for sources other than the digital operator interface for the output frequency
and Run command sources, respectively. When the [OPE] input is ON, then
user has immediate command of the inverter, to start or stop the motor and to
set the speed.
Option Terminal
Code Symbol

OPE Forced
operator
~
Valid for inputs:
 (set not equal to )
Required settings:
 (set not equal to )
Notes:
• When changing the [OPE] state during Run Mode (inverter is driving the motor),
the inverter will stop the motor before the new [OPE] state takes effect.
• If the [OPE] input turns ON and the digital operator gives a Run command while the
inverter is already running, the inverter stops the motor. Then the digital operator
can control the motor.
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 accelera-
tion 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 regenera-
tion)" is selected for b021/b024, the frequency will increase if current exceed-
ing the overload limit level flows during regeneration operation.
If the setting of Overload Limit Parameter b023/b026 is too small, an overvolt-
age trip may occur beacuse of regenerative energy from the motor even dur-
ing 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.
Function State
Name
ON Forces the operator interface to
override:  – Frequency Source
Setting, and  – Run Command
Source Setting
Parameters  and  are
OFF
in effect again, for the frequency
source and the Run command
source, respectively
Section 4-5
 
and are configured
Description