Phase Loss Power Input Protection (B006) - Hitachi SJ700B Series Instruction Manual

Chapter 4 Explanation of Functions
(3) Restarting methods
- Restart with matching frequency
The inverter detects the frequency and rotation direction based on the residual voltage in the motor,
and then restarts the motor based on the detected frequency.
- Restart with input frequency
The inverter starts the output with the frequency specified for the start frequency selection (b030),
searches for the point where the frequency and voltage are balanced while keeping the current at
the restart current level (b028), and then restarts the motor.
If the inverter trips when it restarts the motor in this way, reduce the setting of "b028".
- After the inverter output has been shut off, the digital operator continues to display
the inverter restarts the motor operation.
FW
FRS
Output current
Inverter output
frequency
Motor speed
4.2.28 Phase loss power input protection
The phase loss power input protection function gives a warning when
phase loss power is input to the inverter.
Item
Phase loss detection
enable
An phase loss power input may cause the following conditions, resulting in an inverter failure:
(1) The ripple current increases in the main capacitor, and the capacitor life will be shortened significantly.
(2) When the inverter is connected to a load, the internal converter or thyristor of the inverter may be
damaged.
b003
Function code
b006
b028
Deceleration according to
the setting of "b029"
Frequency selected as the
setting of "b030"
Data
00 Disabling the protection
01 Enabling the protection
4 - 36
Related code
b006: Phase loss detection enable
Description
until