Measures Against Overvoltage; Overvoltage Suppression Function During Deceleration - Omron MX2 Series User Manual

5-12 Measures against Overvoltage

5-12-1 Overvoltage Suppression Function during Deceleration

• Use this function to prevent overvoltage trip caused by the regenerative energy from the motor during
deceleration.
• Enable or disable the function in the Overvoltage Suppression Function Selection During Decelera-
tion (b130). For the 3G3MX2-V1 Series, this function is set by default to 01 (Enabled: DC voltage
kept constant).
• If the Overvoltage Suppression Function Selection During Deceleration (b130) is set to 01 (Enabled:
DC voltage constant control), the inverter decelerates automatically while keeping the main circuit
DC voltage rise due to deceleration start at the Overvoltage Suppression Level During Deceleration
(b131).
• If the Overvoltage Suppression Function Selection During Deceleration (b130) is set to 02 (Enabled:
Acceleration enabled), the inverter starts accelerating according to the Overvoltage Suppression Param-
eter During Deceleration (b132) setting when the main circuit DC voltage increases due to the start of
deceleration to exceed the Overvoltage Suppression Level During Deceleration (b131). After that, when
the main circuit DC voltage falls below the value set in b131, the inverter starts deceleration again.
• To use this function, set the Usage Rate of Regenerative Braking (b090) to 0.0 (Regenerative braking
not active) and the Regenerative Braking Selection (b095) to 00 (Disabled).
Parameter
No.
Overvoltage Suppression Func-
b130
tion Selection During Deceleration
Overvoltage Suppression Level Dur-
b131
ing Deceleration
Overvoltage Suppression Parame-
b132
ter During Deceleration
Overvoltage Suppression Propor-
b133
tional Gain During Deceleration
Overvoltage Suppression Integral
b134
Time During Deceleration
Usage Rate of Regenerative Brak-
b090
ing
b095 Regenerative Braking Selection
*1. When b130 is set to 01, PI control works to keep the internal DC voltage constant.
Although increasing the Overvoltage Suppression Proportional Gain During Deceleration (b133) provides a
faster response, setting it to an excessive large value may cause an overcurrent trip.
Increasing the Overvoltage Suppression Integral Time During Deceleration (b134) also provides a faster
response, but setting it to an excessive small value may cause an overcurrent trip.
*2. If b131 is set to a value less than the input voltage, the inverter may not be able to stop the motor. Normally,
do not set this value to 350 V or less for 200-V class and 700 V or less for 400-V class.
*3. The default data was changed from the previous model.
Multi-function Compact Inverter 3G3MX2-V1 User's Manual (I585-E1)
Function name
00:
01:
02:
200-V class: 330. to 395.
400-V class: 660. to 790.
*2
0.10 to 30.00:
Set the acceleration rate for the
output frequency when the over-
voltage suppression during
deceleration function is enabled.
Set the acceleration time from 0
Hz to the maximum frequency.
0.00 to 5.00:
Proportional gain for DC voltage
constant control (b130 = 01 only)
0.0 to 150.0:
Integral time when DC voltage is
kept constant (b130 = 01 only)
0.0: Regenerative braking not
00:
Data
Disabled
Enabled (DC voltage kept
constant) (Example 1) *1
Enabled (Acceleration
enabled) (Example 2)
active
Disabled
5 Basic Settings
Default data Unit
−
01
*3
380./760. V
1.00 s
−
0.20
1.0 s
0.0 %
−
0.0
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