Continuing Operation; Restarting Automatically After Power Is Restored - YASKAWA CIMR-F7A Instruction Manual

Continuing Operation

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

Restarting Automatically After Power Is Restored

Even if a temporary power loss occurs, you can perform estimated/current detection speed search using the
speed search function (b3-01) and restart the Inverter automatically after power is restored to continue motor
operation. To restart the Inverter after power has been restored, set L2-01 to 1 or 2. Make settings of L2-01 to
L2-05 and b3-01 for related details of restarting.
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 undervoltage) will not
be detected.
Related Constants
Con-
stant
Number
Momentary
L2-01 power loss
detection
Momentary
L2-02 power loss
ridethru time
Min. base-
L2-03
block time
-66
6
Name Description
0: Disabled [main circuit
undervoltage (UV1)
detection]
1: Enabled [Restarted when the
power returns within the
time for L2-02. When L2-02
is exceeded, main circuit
undervoltage (UV1)
detection.]
2: Enabled while CPU is
operating. [Restarts when
power returns during control
operations. Does not detect
main circuit undervoltage
(UV1).]
Ridethrough time, when
Momentary Power Loss Selec-
tion (L2-01) is set to 1, in units
of seconds.
Sets the Inverter's minimum
baseblock time in units of one
second, when the Inverter is
restarted after power loss ride-
through.
Sets the time to approximately
0.7 times the motor secondary
circuit time constant.
When an overcurrent or over-
voltage occurs when starting a
speed search or DC injection
braking, increase the set values.
Control Methods
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
*1
0.1 to
0.2 s
No A
5.0
*1
MEMO
Open
BUS
V/f Flux
Loop
Regis-
with Vec-
Vec-
ter
PG tor
tor
A A A 485H
A A A 486H
A A A 487H