Continuing Operation; Restarting Automatically After Power Is Restored - YASKAWA CIMR-ACA4011 Instruction Manual

Continuing Operation

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

Restarting Automatically after Power is Restored

Even if a temporary power loss occurs, the MxC can restart automatically after power is restored to continue
motor operation.
To restart the MxC 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 MxC 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 MxC will restart. Consequently, alarm FDEV (power supply frequency
fault) will not be detected.
Related Parameters
Parameter
Number
L2-01
L2-02
L2-03
L2-04
L2-05
L2-13
-56
6
Name
Display
Momentary Power Enables and disables the momentary power
Loss Detection loss function.
Selection 0: Disabled. - MxC trips on (FDV) fault
when power is lost.
1: Power Loss Ridethrough Time - MxC will
restart if power returns within the time set
in L2-02.
PwrL Selection
2: CPU Power Active - MxC will restart if
power returns prior to control power sup-
ply shut down.
Momentary Power
Sets the power loss ridethrough time. This
Loss Ride-thru
value is dependent on the capacity of the
Time
MxC. Enabled only when L2-01 = 1.
PwrL Ridethru t
Momentary Power Sets the minimum time to wait to allow the
Loss Minimum residual motor voltage to decay before the
Base Block Time MxC output turns back on during power loss
ridethrough. After a power loss, if L2-03 is
greater than L2-02, operation resumes after
PwrL Baseblock t
the time set in L2-03.
Momentary Power
Loss Voltage
Sets the time it takes the output voltage to
Recovery Ramp
return to the preset V/f pattern after speed
Time
search (Current Detection Mode) is complete.
PwrL V/f Ramp t
Undervoltage Sets the PS undervoltage trip level of the
Detection Level MxC. If this is set lower than the default,
additional AC input reactance or PS voltage
may be necessary. Consult the factory before
PUV Det Level
changing this parameter setting.
Power frequency Set the gain to detect a power frequency fault
fault detection gain (FDV).
If an FDV is detected when no momentary
power loss occurred, decrease the set value in
FDV Gain
units of 0.1.
Setting
Description
Range
0 to 2
0 to 2.5
0.1 to
5.0
0.0 to
5.0
150 to
210
*2
0.1 to
2.0
Control Methods
Change
Open
Default during
V/f Loop
Run
Vector
0 No A A
0.5 s
No A A
*1
0.7 s
No A A
*1
1.5 s
No A A
*1
190
No A A
VDC
*2
1.0 No A A
Flux
Vector
A
A
A
A
A
A