MX2 Quick Start Guide
34 MX2 Quick Start Guide
Over-current Trip Suppression function monitors the motor current
and actively changes the output frequency profile to keep the motor cur-
rent below 150% of the motor rated current. Basically the acceleration
ramp is at stopped above this current and it only restarts when the cur-
rent goes below again. It avoids the trip but the total acceleration time
could be longer when this function is enable.
Additionally should be considered that this function doesn’t operate
keeping a constant motor current so is still possible to have an over-cur-
rent trip during extreme acceleration.
3.22 Overvoltage protection
DC Bus AVR (Automatic Voltage regulation) helps to avoid an overvoltage
trip when the DC bus voltage increase due regeneration during decelera-
tion. The function keeps the DC bus voltage stable at certain level regulating
the deceleration ramp by a PI function. Please note that the actual decelera-
tion time can be longer in this case.
Parameter Parameter name Description
b021 Overload restriction operation mode 00 Disabled
01 Enabled for acceleration and constant speed
02 Enabled for constant speed only
03 Enabled for acceleration and constant speed, increase speed at regen.
b022 Overload restriction level Sets the level of overload restriction, between 20% and 200% of the rated current of
the inverter, setting resolution is 1% of rated current
b023 Deceleration rate at overload restriction Sets the deceleration rate when inverter detects overload, range is 0.1 to 3000.0, reso-
lution 0.1
b024 Overload restriction operation mode 2 00 Disabled
01 Enabled for acceleration and constant speed
02 Enabled for constant speed only
03 Enabled for acceleration and constant speed, increase speed at regen.
b025 Overload restriction level 2 Sets the level of overload restriction, between 20% and 200% of the rated current of
the inverter, setting resolution is 1% of rated current
b026 Deceleration rate 2 at overload restriction Sets the deceleration rate when inverter detects overload, range is 0.1 to 3000.0, reso-
lution 0.1
b027 OC suppression selection * 00 Disabled
01 Enabled
Parameter Parameter name Description
b130 Deceleration overvoltage sup-
pression enable
00 Disabled
01 Enabled
02 Enabled with accel.
b131 Decel. overvolt. suppress level DC bus voltage of suppression. Range is:
200 V class 330 to 395
400 V class 660 to 790
b132 Decel. overvolt. suppress const. Accel. rate when b130=02.
Set range: 0.10 ~ 30.00 sec.
b133 Decel. overvolt. suppress
proportional gain
Proportional gain when b130=01. Range is:
0.00 to 5.00
b134 Decel. overvolt. suppress
integral time
Integration time when b130=01. Range is: 0.00
to 150.0
Motor
current
0
t
Output
frequency
0
t
Stops accel
Resumes accel
B027 = 01
OC LAD STOP = Enabled
Set acc time
Actual acc time
Approx. 150% of the inverter
rated current
Threshold voltage to start DC bus AVR (B131)
DC bus AVR
t
t
DC bus voltage
Freq
Normal
operation
b130 = 01
I129E-EN-02+MX2+QuickStartGuide.book Seite 34 Mittwoch, 7. November 2012 1:54 13
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