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Operation selection at power failure and instantaneous power failure
4
PARAMETERS
When Pr. 162 = 1, 11 (without frequency search) (1) Automatic restart operation selection
(Pr. 30, Pr. 162, Pr. 299)
Without frequency search
When Pr. 162 = "1 or 11", automatic restart operation is
performed in a reduced voltage system, where the
voltage is gradually risen with the output frequency
unchanged from prior to an instantaneous power failure
independently of the coasting speed of the motor.
When Pr. 162 = 0, 10 (with frequency search)
With frequency search
When "0 (initial value) or 10" is set in Pr. 162, the inverter
smoothly starts after detecting the motor speed upon
power restoration. (The motor capacity should be equal to
or one rank lower than the inverter capacity)
When using the frequency search, perform offline auto
tuning.
(Refer to page 105 for general-purpose magnetic flux
vector control and page 139 for V/F control.)
During reverse rotation, the inverter can be restarted
smoothly as the direction of rotation is detected.
You can select whether to make rotation direction
detection or not with Pr. 299 Rotation direction detection
selection at restarting.
When capacities of the motor and inverter differ, set "0"
(without rotation direction detection) in Pr. 299.
REMARKS
Speed detection time (frequency search) changes according to the motor speed. (maximum 100ms)
When the inverter capacity is two rank or more larger than the motor capacity, the inverter may not start due to overcurrent trip (E.OC).
If two or more motors are connected to one inverter, the inverter functions abnormally. (The inverter does not start smoothly.)
When reverse rotation is detected under the condition of Pr. 78 = "1" (reverse rotation disabled), the rotation direction is
changed to forward rotation after decelerates in reverse rotation when the start command is forward rotation. The inverter will
not start when the start command is reverse rotation.
Instantaneous (power failure) time
Coasting time
Pr. 57 setting
Restart cushion time
(Pr. 58 setting)
Power supply
(R/L1, S/L2, T/L3)
Motor speed N
(r/min)
Inverter output
frequency f (Hz)
Inverter output
voltage E (V)
* The output shut off timing differs according to the load condition.
*
REMARKS
This system stores the output frequency and
rotation direction prior to an instantaneous power
failure and restart using the stored value.
Therefore, if the instantaneous power failure time
exceeds 0.2s and the stored value cannot be
retained, the inverter starts at Pr. 13 Starting
frequency (initial value = 0.5Hz) in the starting
direction upon power restoration.
Instantaneous (power failure) time
Power supply
(R/L1, S/L2, T/L3)
Motor speed N
(r/min)
Inverter output
frequency f (Hz)
Inverter output
voltage E (V)
Coasting time
(Pr. 57 )
Speed
detection time
+
Acceleration time
at a restart
(Pr. 611 setting)
*
* The output shut off timing differs
according to the load condition.
Restart cushion time
(Pr. 58 setting)
: the rotation direction is detected.
×: the rotation direction is not detected.
Pr. 299 Setting
Pr. 78 Setting
0 1 2
9999 ××
0 (initial value) ×××
1