SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.

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 until
the inverter restarts the motor operation.
FW
Output current
Inverter output
frequency
Motor speed
FRS
b003
b028
Deceleration according to
the setting of "b029"
Frequency selected as the
setting of "b030"
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.
Related code
b006: Phase loss detection enable
Item Function code Data Description
Phase loss detection
00 Disabling the protection
b006
enable
01 Enabling the protection
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.
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