Omron RX2 Series - Overvoltage Suppression Function During Deceleration

8 Applied Settings
8 - 44
High-function General-purpose Inverter RX2 Series User’s Manual
This function is used to prevent overvoltage trip caused by the regenerative energy from the motor
during deceleration.
[bA140] overvoltage suppression function selection allows you to enable the overvoltage suppression
function.
The overvoltage suppression function will be activated when the internal DC voltage of the inverter
main circuit capacitor exceeds the value set by [bA141] overvoltage suppression level.
When this function is used, set the Dynamic brake (BRD) usage rate [bA-60] to 0.0 (BDR function is not
activated) and the Dynamic brake (BRD) selection [bA-61] to 00 (Disabled).
Precautions for Correct Use
• When this function is enabled, the actual deceleration time may get longer than the set value.
• When using this function, it may take long time before the motor stops depending on the
motor load moment of inertia.
• Depending on the deceleration rate or load status, the overvoltage tripping may be triggered
even if this function is enabled.
• Set [bA141] to be receiving voltage x √2 × 1.1 or higher. Setting a value lower than the P-N
voltage in operation may prevent the motor from stopping.
• This function is not activated while the position/torque are controlled.
 Parameter
8-2-3 Overvoltage Suppression Function During Deceleration
Item Parameter Data Description
Default
data
Over-voltage sup-
pression enable,
1st-motor
[bA140]
00 Disabled
00
01 Constant DC voltage-controlled deceleration
02
Function to avoid overvoltage acceleration
(only in deceleration)
03 Function to avoid overvoltage acceleration
Over-voltage sup-
pression active
level, 1st-motor
[bA141]
200 V class:
330.0 to 400.0 (V)
400 V class:
660.0 to 800.0 (V)
Sets the level at which the overvoltage sup-
pression function starts.
(200V
class)
380.0
(400V
class)
760.0
Over-voltage sup-
pression action time,
1st-motor
[bA142]
0.00 to
3600.00(s)
Acceleration time when the overvoltage sup-
pression function is activated.
1.00
DC bus constant
control proportional
gain, 1st-motor
[bA144] 0.00 to 5.00
Proportional gain for PI control in constant
DC voltage control.
0.20
DC bus constant
control integral gain,
1st-motor
[bA145] 0.00 to 150.00
Integral gain for PI control in constant DC
voltage control.
1.00