Hitachi SJ Series, User Manual

Page: 316 / 786

12-13-9
Chapter 12
Inverter Function
12.13.6 Restarting after undervoltage
• Main power was momentarily turned off due to
power failure.
• I want to start the motor according to the motor
rotation when restarting after undervoltage.
• You can select either tripping ([bb-21] = 00) with
power supply recovery or retrying restarting
([bb-21]
≠
00) when the main power (R, S, T) fails.
• If the input power supply to the inverter is input
separately to main power supply (R, S, T) and
control power supply (R0, T0), the operation
depends on how the power to the main power
supply (R, S, T) drops.
• When [bb-27] = 00, you can avoid undervoltage
error if the main power supply is to be turned off for
saving energy while the inverter output is being
stopped.
• When [bb-27] = 02, you can avoid undervoltage
error caused by power shutdown during
deceleration and stop.
Parameters
(Ex. 1) When [bb-21] = 00, tripping occurs
• If the input power supply to the inverter is input to
the control power supply (R0, T0) via main power
supply (R, S, T), instantaneous power failure
tripping or instantaneous power failure retry may be
triggered first depending on the operating situation.
• If the control power supply has failed completely,
the action to be taken is the powering on.
• After 40 seconds with the main power supply (R, S,
T) failed, the undervoltage will occur and the motor
will trip even if [bb-27] = 00 or 02.
• Inverter internal P-N voltage can be monitored with
[dA-40].
(Ex. 2) When [bb-21]
≠
00 and [bb-24] = 00,
it restarts at 0 Hz.
Item Parameter Data Description
Undervoltage retry
count selection
[bb-21]
00~16/
∞
(255)
(Counts)
Sets the undervoltage retry restarting counts.
If this is set to 0, the motor will trip upon undervoltage.
Instantaneous
power
failure/undervoltage
retry selection
[bb-24]
00 Restarts at 0 Hz
01 Restarts with the frequency matching
02 Restarts upon frequency pull-in
03 Detection speed (frequency) <v2.00 or higher>
04
Trips after decelerating and stopping with the frequency
matching
Instantaneous
power
failure/undervoltage
retry standby time
[bb-26] 0.3~100.0(s)
Starts after waiting for the set time upon power voltage
recovery.
Instantaneous
power
failure/undervoltage
tripping selection
during stop
[bb-27]
00 Disabled
01 Enabled
02 Disabled during stop and deceleration stop
Q
A
!
Power Supply
P-N Voltage
Inverter
Output
Motor Speed
[AL]
UV Level
UV error occurs
Free Running
Power Supply
P-N Voltage
Inverter
Output
Motor Speed
[AL]
UV Level
Free Running
Retry Standby Time