Omron MX2 Series User Manual

7 Other Functions
7 - 49
Multi-function Compact Inverter 3G3MX2-EV2 User’s Manual (I666-E1)
This function limits the PID output to within the variable range defined based on the target value.
To use this function, set the PID Variable Range Limit (A078) as a percentage of the maximum fre-
quency. Then, the output frequency will be limited to within a range of Target value ± (A078).
When the PID Selection (A071) is set to 01 (Enabled) or 02 (Enabled (Reverse output enabled)), this
function is enabled.
PID output [%]
PID target value
PID output range
PID Variable Range Limit (A078)
PID Variable Range Limit (A078)
Time [s]
Under normal PID control (A071 = 01), the frequency reference to the inverter will be limited to 0 Hz if
the result of PID operation is a negative value. However, when the PID Selection (A071) is set to 02
(Reverse output enabled), reverse output is enabled for the inverter if the result of PID operation is a
negative value.
If the PID function does not provide a stable response, adjust the appropriate gain setting according to
the table below.
Phenomenon
Adjustment
Changes in target value are not reflected quickly on feedback value.
Increase PID P Gain (A072).
Changes are reflected quickly on feedback value, but not stable.
Decrease PID P Gain (A072).
Target and feedback values do not match quickly.
Decrease PID I Gain (A073).
Feedback value fluctuates unstably.
Increase PID I Gain (A073).
Increasing PID P Gain does not improve response speed.
Increase PID D Gain (A074).
Increasing PID P Gain results in fluctuating and unstable feedback value.
Decrease PID D Gain (A074).
You can set the PID Deviation Excessive Level (C044) for PID control. This inverter can be configured
to output this signal to a multi-function output terminal if the PID deviation ε reaches the level set in
C044 or higher. The inverter will not shut off its output (trip), however.
Allocate the Multi-function Output 11/12 Selection (C021/C022) or the Multi-function Relay Output (AL1,
AL2) Function Selection (C026) to 04 (OD).
Set C044 in units of percentage as 100% of the 1st/2nd Maximum Frequency (A004/A204).
PID Variable Range
PID Reverse Output
PID Gain Adjustment
PID Deviation Excessive (OD)

Omron MX2 Series Specifications

General

Cooling Method	Fan cooling
Output Frequency Range	0.1 to 400 Hz
Control Method	V/f control, Sensorless vector control
Protection Functions	Overcurrent, overvoltage, undervoltage, overload, overheating, short circuit
Communication Options	Modbus RTU
Overload Capacity	150% for 60 seconds
Braking Unit	Built-in
Ambient Operating Temperature	-10°C to +50°C
Enclosure	IP20
Storage Temperature	-20°C to +65°C
Humidity	5 to 95% RH (non-condensing)
Altitude	Up to 1000m
Power Supply Voltage	200-240V AC
Input Voltage	3-phase 200-240V AC