Omron RX Series User Manual page 241

(Example 1) 0-Hz restart (b088 = 00)
FW
FRS
Free running
Motor
rotation
speed
0
• The inverter restarts at 0 Hz independent of the
motor rotation speed. The restart standby time
setting will be ignored during 0-Hz restart.
• If the inverter starts at 0 Hz at a high motor rotation
speed, an overcurrent trip may occur.
(Example 3) Frequency pull-in restart (b088 = 02)
FW Input
(forward)
RS Input
Output
current
Inverter
output
frequency
Motor
rotation
speed
• When the set Restart Standby Time (b003) elapses, the
inverter starts output at the frequency set in the Starting
Frequency Selection at Frequency Pull-in Restart (b030).
Then, the inverter decelerates the motor according to the
Frequency Pull-in Restart Parameter (b029) setting, while
suppressing the output current to the value set in the
Frequency Pull-in Restart Level (b028).
• When the current decreases to or below the
Frequency Pull-in Restart Level (b028), the inverter
accelerates the motor again to return to the original
frequency.
• If an overcurrent trip occurs with this method,
reduce the Frequency Pull-in Restart Level (b028).
High-function General-purpose Inverter 3G3RX-V1 User's Manual (I578-E1)
0-Hz start
Decelerates
according to b029
b028
Frequency selected
in b030
b003
(Example 2) Frequency matching start (b088 = 01)
FW
FRS
Motor
rotation
speed
0
b003
• When the restart standby time elapses after
the FRS terminal is turned OFF, the inverter
pulls in the motor frequency to execute the
frequency matching restart function without
stopping the motor rotation. If an overcurrent
trip occurs during a frequency matching restart,
increase the restart standby time.
• Even when the Free-run Stop Selection is set
to 01 (Frequency matching start), the inverter
may restart at 0 Hz in the following cases.
• The output frequency is equal to or lower
than 1/2 of the base frequency.
• The motor induction voltage decays quickly.
• The inverter recognizes that the detected
frequency is equal to or less than the value
set in the Frequency Matching Lower Limit
Frequency (b007).
5 Basic Settings
Free running
Frequency matching start
5 - 45
5