Omron SYSDRIVE MX2 SERIES - Deceleration Stop at Power-Off (Controlled Deceleration on Power Loss Function)

5-106
5-8 Restart Functions
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
5
Functions
Deceleration Stop at Power-off (Controlled Deceleration on Power Loss Function)
After the power is shut off during operation, this function decelerates the Inverter to a stop while
keeping the voltage below the overvoltage level.
You can select from 3 modes in momentary power interruption non-stop selection b050.
This function will not be reset until the operation stops completely. To run the Inverter after
power recovery while this function is active, input a STOP command (after turning OFF the
RUN command) and then input a RUN command again.
Parameter
No.
Function name Data
Default
setting
Unit
b050
Controlled
Deceleration on
Power Loss
00: Controlled deceleration on power loss
function disabled
00 −
01: Controlled deceleration on power loss
enabled (deceleration stop)
02: Controlled deceleration on power loss
enabled (DC voltage kept constant,
without recovery)
*1
03: Controlled deceleration on power loss
enabled (DC voltage kept constant,
with recovery)
*1
b051
DC Bus Voltage
Trigger Level of
Ctrl. Decel
*2
0.0 to to 1000.
Operation starts when the DC voltage
drops to below b051.
220.0/440.0 V
b052
Deceleration Hold
Level of Ctrl.
Decel
* 2, *3
0.0 to 1000.
The Inverter starts to decelerate when the
overvoltage due to regeneration exceeds
b052 after the start of operation.
360.0/720.0 V
b053
Deceleration Time
of Ctrl. Decel
*4
0.01 to 3600.00
Set the deceleration time under the
controlled deceleration on power loss
function.
1.0 s
b054
Freq. Drop to start
Ctrl. Decel
* 2
0.00 to 10.00
Set the frequency at which the Inverter
starts to decelerate, as the difference
from the output frequency.
0.00 Hz
*1.When b050 = 02 or 03, PI control is performed to keep the internal DC voltage constant. Though quicker
response is expected when the setting of Proportional Gain (b133) is increased, if the setting is too
large a trip will occur easily. With a smaller proportional gain setting on the other hand, an undervoltage
trip will occur due to a drop in voltage immediately after this function starts operating. Response also
becomes quicker when the setting of Integral Time (b134) is decreased, but if the setting is too small a
trip will occur easily, as well.
*2.Make sure that the set values of b051 and b052 are larger than the undervoltage level (210 V for 200
V class, 410V for 400V class). If undervoltage occurs, this function is disabled. Make sure that b051 is
smaller than b052. If the difference between the settings of (b051) and (b052) is large, and setting too
large a value for proportional Gain (b133) may cause sudden acceleration immediately after this
function starts operating and overcurrent may flow.