Continuing To Drive Even After Instantaneous Power Failure/Undervoltage Error - Hitachi WJ Series User Manual

Chapter 9
9.9.8

Continuing to Drive Even after Instantaneous Power Failure/Undervoltage Error

 How to keep the motor running without shutting off the output after instantaneous power failure
Q
or undervoltage error occurs?
 How to resume operation when the power is restored without shutting off the output after
instantaneous power failure or undervoltage error occurs?
 The non-stop operation during instantaneous power failure function is a function that
A
decelerates the motor to stop without shutting off the inverter output and without exceeding the
overvoltage level, even when a power interruption occurs during operation.
 Three deceleration stop operation modes can be selected by setting "Instantaneous power
failure non-stop function, mode selection [b050]".
 The "Instantaneous power failure non-stop function, start voltage level [b051]" and the
!
"Instantaneous power failure non-stop function, target voltage level [b052]" should be equal to
or greater than the undervoltage level (approx. 172.5 VDC for 200 V class and 345 VDC for 400
V class). This function does not operate when there is an undervoltage. Also, set the [b051]
value to be smaller than that of [b052].
 When " Instantaneous power failure non-stop function, mode selection [b050]" is set to either
"Deceleration-stop (01)", "Voltage controlled deceleration-stop (without recovery) (02)", or
"Voltage controlled deceleration-stop (with recovery) (03)" to perform deceleration stop, this
function is not released until the deceleration stop is completed after this function is activated.
When restarting the inverter, confirm that deceleration stop by this function is completed and
the power has returned, turn off the RUN command once, and then turn it on again.
Code
Instantaneous power
failure non-stop
[b050]
function, mode
selection
Instantaneous power
failure non-stop
[b051]
function, start voltage
level
Instantaneous power
failure non-stop
[b052]
function, target voltage
level
Instantaneous power
failure non-stop
[b053]
function, deceleration
time
Instantaneous power
failure non-stop
[b054]
function, start
frequency decrement
Constant DC bus
[b133]
voltage control P gain
Constant DC bus
[b134]
voltage control I gain
Item
Disable
Deceleration-stop:
This decelerates the motor to stop.
Voltage controlled deceleration-stop (without recovery):
This decelerates the motor to stop while
performing constant DC voltage control. The
deceleration stop continues even after the
power returns.
Voltage controlled deceleration-stop (with recovery):
This decelerates the motor to stop while
performing constant DC voltage control.
When the power returns, operation resumes.
Deceleration starts when the P-N voltage falls
to or below this setting.
After deceleration starts, when the P-N voltage
exceeds this setting due to regeneration, this
temporarily stops deceleration.
Sets the deceleration time during the operation
of this function.
Sets the difference between the output
frequency and the frequency at which
deceleration starts.
Proportional gain for PI control of constant DC
voltage control.
Integral gain for PI control of constant DC
voltage control.
9-9-17
Inverter Functions
Description Data
00
01
02
03
200 V class:
0.0 to 400.0 (VDC)
400 V class:
0.0 to 800.0 (VDC)
200 V class:
0.0 to 400.0 (VDC)
400 V class:
0.0 to 800.0 (VDC)
0.01 to 3600.00 (s)
0.00 to 10.00 (Hz)
0.00 to 5.00
0.0 to 150.0 (s)