Omron MX2 User Manual

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"B" Group: Fine Tuning Functions Section 3-6
3-6 "B" Group: Fine Tuning Functions
The "B" Group of functions and parameters adjust some of the more subtle
but useful aspects of motor control and system configuration.
3-6-1 Automatic Restart Mode
The restart mode determines how the inverter will resume operation after a
fault causes a trip event. The five options provide advantages for your applica-
tions. Frequency matching allows the inverter to read the motor speed by vir-
tue of its residual magnetic flux and restart the output at the corresponding
frequency. The inverter can attempt a restart a certain number of times
depending on the particular trip event:
• Over-current trip, restart up to 3 times
• Over-voltage trip, restart up to 3 times
When the inverter reaches the maximum number of restarts (3), you must
power cycle the inverter to reset its operation.
Other parameters specify the allowable under-voltage level and the delay time
before restarting. The proper settings depend on the typical fault conditions
for your application, the necessity of restarting the process in unattended situ-
ations, and whether restarting is always say.
If the actual power
failure time is shorter
than the B002 set
value, inverter
resumes from the set
frequency in B011.
The resumption mode
is called "active fre-
quency matching"
and the inverter per-
forms reduced volt-
age start to avoid
over-current trip.
If the motor current
exceeds the B030 set
value during this
period, the inverter
decelerates accord-
ing to the B029 set
value and helps to
reduce the motor cur-
rent.
When the motor current is less than B030, the inverter increases motor speed
toward the set speed. The inverter continues this retry process until the motor
speed comes to the previous set speed.
Overload restriction (B021~B028) is not valid when active frequency matching
is activated.
If the actual power failure time is longer than the B002 set value, the inverter
does not resume and the motor will coast to stop.
Free-running
B003
B002
Retry wait time
Power fail
B030
B029
Power failure < allowable power fail
time (b022
b022
), Inverter resumes
Restart level of active
freq. matching
Input
power
Inverter
output
Motor
current
Motor
rotation
Allowable power
fail time
Deceleration rate of active
freq. matching

Omron MX2 Specifications

General

Model	MX2
Category	Inverter
Enclosure Rating	IP20
Control Method	V/f control, Sensorless vector control
Frequency Range	0.1 to 400 Hz
Protection	Overcurrent, Overvoltage, Undervoltage, Overheat, Short circuit
Communication	Modbus RTU
Ambient Temperature	-10 to 50 °C (without freezing or condensation)
Overload Capacity	150% for 60 seconds
Cooling Method	Fan Cooled
Humidity	5 to 95% RH (without condensation)
Altitude	Up to 1000m without derating
Voltage	200-240 VAC, 380-480 VAC
Braking Unit	Built-in (for certain models), Optional External