Hitachi SJ Series, User Manual

Page: 326 / 786

12-13-19
Chapter 12
Inverter Function
Instantaneous power failure non-stop constant DC
voltage control
([bA-30] = 02: No recovery, [bA-30] = 03: Recovery)
• This function maintains the main circuit DC voltage
to the value set by [bA-32] instantaneous power
failure non-stop level while decelerating if
instantaneous power failure occurs or the main
circuit DC voltage drops during operation.
• The condition to activate this function is when all
the conditions below are met.
- [bA-30] is 02 or 03
- In operation (It will not function while being tripped,
undervoltage or stopped)
- When the instantaneous power failure occurs at
the control power supply or when the main circuit
DC voltage drops to b051, instantaneous power
failure non-stop function starting voltage, or
lower.
• This function is activated if the conditions to start
operation mentioned above are met even if the
power line for J51 connector connected to R0 and
T0 terminals are disconnected to be connected
from P of the main terminal to R0 and from N to T0,
or even if the control power supply and main circuit
power supply are powered independently.
• If the instantaneous power failure time is short,
continuous operation without interrupting output is
possible. However, if undervoltage is observed
upon instantaneous power failure, the output is
interrupted immediately and this function will be
terminated. The operation after recovering from the
instantaneous power failure depends on the
selection of how to restart after instantaneous
power failure and undervoltage.
• When [bA-30] is 03, the normal operation can be
restored if recovered from the instantaneous power
failure and the power is received before the output
will be interrupted. However, it may decelerate and
stop depending on the [bA-31] setting. Details are
given below.
• If the motor decelerates and stops as a result of
this function activated, it will be forced to stop even
if [FW] is ON. Verify that the power is restored
before powering on [FW] again when restarting.
[bA-30] [bA-31] Action
02 (No recovery)
[bA-32] > Main circuit DC voltage upon power recovery Deceleration stop (constant DC voltage control) (Ex. 1)
[bA-32] < Main circuit DC voltage upon power recovery Deceleration stops (normal operation) (Ex. 2)
03 (With
recovery)
[bA-32] > Main circuit DC voltage upon power recovery Deceleration stop (constant DC voltage control) (Ex. 1)
[bA-32] < Main circuit DC voltage upon power recovery Operation (normal operation) (Ex. 2)
A