Continuing Operation; Restarting Automatically After Power Is Restored - Omron VARISPEED G7 Instruction Manual

Continuing Operation

This section explains functions for continuing or automatically restarting Inverter operation even if an
error occurs.

Restarting Automatically After Power Is Restored

Even if a temporary power loss occurs, you can restart the Inverter automatically after power is restored to
continue motor operation.
To restart the Inverter after power is restored, set L2-01 to 1 or 2.
If L2-01 is set to 1, when power is restored within the time set in L2-02, the Inverter will restart. If the time set
in L2-02 is exceeded, alarm UV1 (main circuit undervoltage) will be detected.
If L2-01 is set to 2, when the main power supply is restored while the control power supply (i.e., power supply
to the control panel) is backed up, the Inverter will restart. Consequently, alarm UV1 (main circuit undervolt-
age) will not be detected.
Related Constants
Name
Con-
stant
Display
Number
Momentary
power loss
detection
L2-01
PwrL Selec-
tion
Momentary
power loss
ridethru time
L2-02
PwrL Ride-
thru t
Min. base-
block time
L2-03
PwrL Base-
block t
Voltage
recovery time
L2-04
PwrL V/F
Ramp t
Description
0: Disabled (main circuit
undervoltage (UV) detection)
1: Enabled (Restarted when the
power returns within the time
for L2-02. When L2-02 is
exceeded, main circuit
undervoltage detection.)
2: Enabled while CPU is operating.
(Restarts when power returns
during control operations. Does
not detect main circuit
undervoltage.)
Ridethrough time, when Momen-
tary Power Loss Selection (L2-01)
is set to 1, in units of seconds.
Sets the Inverter's minimum base-
block time in units of one second,
when the Inverter is restarted after
power loss ridethrough.
Sets the time to approximately 0.7
times the motor secondary circuit
time constant.
When an overcurrent or overvoltage
occurs when starting a speed search
or DC injection braking, increase
the set values.
Sets the time required to return the
Inverter output voltage to normal
voltage at the completion of a speed
search, in units of one second.
Sets the time required to recover
from 0 V to the maximum voltage.
Change
Setting Factory during
Range Setting Opera-
V/f
tion
0 to 2 0 No A
0.1 s
0 to 25.5 No A
*
0.1 to
0.2 s
No A
5.0
*1
0.0 to
0.3 s
No A
5.0
*1
Continuing Operation
Control Methods
Open Open
V/f Flux
Loop Loop
with Vec-
Vector Vector
PG tor
1 2
A A A A
A A A A
A A A A
A A A A
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