Omron SYSDRIVE MX2 SERIES - Page 195

5-80
5-6 Operation Functions
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
5
Functions
Switching from Commercial Power Supply Operation to Inverter Operation
Switch MC1 to MC3 according to the sequence shown below. Turn the CS terminal to ON and
then OFF, when both RUN command and CS input are ON. After an elapse of the period set
by Restart Standby Time (b003), the Inverter will accelerate by matching the frequency to the
rotation speed of the motor running freely (frequency matching restart). However, the Inverter
may restart at 0 Hz in the following cases:
 The motor rotation speed is equal to or lower than 1/2 of the base rotation speed
 The motor induction voltage quickly attenuates
 The motor rotation speed dropped to below the level set by Frequency Matching Lower Limit
Frequency Setting (b007).
Examples of Connections and Timing of Commercial Switching Operation
Example of Commercial Switching Timing
NFB
ELBC
MC2
MC1
MC3
THRY
M
R
S
T
U
V
W
R0
T0
FS
FV
SC
MA
MB
MC
FWY
RVY
CSY
FW
RV
CS
SC
Inverter Power ON
MC2/MC3 interlock time
(0.5 to 1 s)
MC2/MC3 interlock time
(0.5 to 1 s)
Inverter Power OFF Inverter Power ON
Commercial
motor
disconnected
MC1
MC2
MC3
INV
motor connected
Commercial
motor connected
Commercial
motor disconnected
INV
motor disconnected
INV
motor connected
FW input
CS input
Motor rotation
speed
Output frequency
Free run
Free run
Frequency
matching restart
Frequency
matching restart
Inverter drive
Commercial power supply drive
Inverter operation Switching to commercial power supply operation
Commercial power supply operation Switching to inverter operation
Inverter drive
b003