Omron MX2 - Active Frequency Matching Restart; Electronic Thermal Overload Alarm Setting

102
"B" Group: Fine Tuning Functions Section 3-6
3-6-2 Active Frequency Matching Restart
Goal of the active frequency matching is the same as normal frequency
matching. Difference is the method. Please select the suitable one for your
application.
3-6-3 Electronic Thermal Overload Alarm Setting
The thermal overload detection protects the inverter and motor from overheat-
ing due to an excessive load. It uses a current/inverse time curve to determine
the trip point.
First, use B013 to select the torque characteristic that matches your load. This
allows the inverter to utilize the best thermal overload characteristic for your
application.
The torque developed in a motor is directly proportional to the current in the
windings, which is also related to the heat generated (and temperature, over
time).
Therefore, you must set the thermal overload threshold in terms of current
(amperes) for parameter B012. The range is 20% to 100% of the rated current
for each inverter model. If the current exceeds the level you specify, the
inverter will trip and log an event (error E 05) in the history table. The inverter
turns the motor output OFF when tripped. Separate settings are available for
the second motor (if applicable) as shown in the following table.
"B" Function Run
Mode
Edit
Defaults
Func.
Code
Name Description EU Units
B028 Current level of active freq.
matching
Sets the current level of active
freq. matching restart, range is
0.1*inverter rated current to
2.0*inverter rated current, resolu-
tion 0.1
8 Rated
current
A
B029 Deceleration rate of active
freq. matching
Sets the deceleration rate when
active freq. matching restart,
range is 0.1 to 3000.0, resolution
0.1
8 0.5 sec.
B030 Start freq. of active freq.
matching
Three option codes:
00... freq at previous shutoff
01... start from max. Hz
02... start from set frequency
8 00 –
"B" Function Run
Mode
Edit
Defaults
Func.
Code
Name Description EU Units
B012 Level of electronic thermal Set a level between 20% and
100% for the rated inverter cur-
rent.
8 Rated current
for each
inverter model
A
B212 Level of electronic thermal,
2
nd
motor
8 A
B013 Electronic thermal characteris-
tic
Select from three curves, option
codes:
00... Reduced torque
01... Constant torque
02... Free setting
8 01
B213 Electronic thermal characteris-
tic, 2
nd
motor
8 01
b015 Free setting electronic thermal
~freq.1
Range is 0 to 400 Hz
*1
8 0.0 Hz
b016 Free setting electronic thermal
~current1
Range is 0 to inverter rated cur-
rent Amps
8 0.00 Amps
b017 Free setting electronic thermal
~freq.2
Range is 0 to 400 Hz
*2
8 0.0 Hz