Hitachi SH1-900H

5-4
Chapter 5
Troubleshooting
5.2 Possible errors and solutions
 If the corrective action does not solve the problem,
contact your supplier or local Hitachi inverter sales
office.
Event ▶
Estimated cause ▶
Corrective action
Screen is not
displayed even
when POWER LED
is illuminated.
・Press a key of the Keypad and the screen will be displayed.
・Keypad in idle mode.
・Recover and reinsert the keypad.
・Keypad has been detached.
Can’t change
settings.
・There are parameters that cannot be modified while
running, refer to the parameter list.
・Inverter is in running.
Motor rotates in
reverse.
・Rotation is reversed by replacing two phases of the motor.
・Wrong wiring order of the
motor phases.
・If a warning has occurred, resolve the data inconsistency.
・A warning came up.
After issuing a
RUN command,
the motor does
not start.
・If an error causes a trip, the cause of the trip will have to be
removed before resetting.
・Trip has occurred.
・Activate a stop function.
・Check if functional safety terminals and 028[RS]/032[FRS]
terminals are enabled through the terminal status [dA-51] .
・Check that the main speed source [AA101] and the
reference (terminal, panel, etc.) are correct.
・Speed source not introduced.
・Check that the RUN command [AA111] and the reference
(terminal, keypad, etc.) are correct.
・Command function not
introduced.
・Motor is restricted/locked.
・Check if there is a braking operation or something inhibiting
the motor (Like something clogged) .
・Wiring is disconnected.
・Check that there are not disconnected cables in the output
to the motor and in the internal side.
Motor/machinery
sound is loud.
・Set higher carrier frequency [bb101], however, that may
increase the heat generation, the generated noise or
leakage current. As a result, some models may require
output current derating.
・Carrier frequency setting is low.