Hitachi SJ Series, User Manual

Page: 633 / 786

18-40
Chapter 18
Tips/FAQ/Troubleshooting
18.6 When Something Seems Wrong
• There is something wrong.
• The inverter doesn’t work as intended.
• You are stuck although no error appears in the
inverter.
• Frequently asked questions are listed below.
• Consult this chapter to solve your problem.
• If the problem still persists, please use the contact
information shown on the back cover.
Q
A
S2: Operator
keypad doesn’t
turn ON (the
POWER lamp on
the operator
keypad VOP is lit.)
• The liquid crystal has reached
the end of its life.
• The screen is lit by pressing a key on the operator keypad.
• The automatic extinction function can be disabled in the
operator keypad system setting.
• Operator keypad is in the
automatic extinction mode.
• Replacement of the operator keypad is required.
• The issue will be solved by remounting the operator keypad.
(Check the RJ45 connector.)
• Operator keypad is about to
come off.
• The brightness of the display is adjustable by changing the
light control setting in the operator keypad system setting.
• The brightness of operator
keypad display is set to low.
Occurrence

Estimated cause(s)

Exemplar measures to be taken
S1: Operator
keypad doesn’t
turn ON (the
POWER lamp on
the operator
keypad VOP is not
lit.)
• The J51 connector is
disconnected.
• Check that the power supply which satisfies the specification
is turned ON.
• When different powers are supplied to the control power
supplies R0 and T0, and to P+ and P- terminals, check that
R0, T0, or 24V power supply is turned ON.
• The power supply is not turned
ON.
• The J51 connector supplies power to the control power
supplies R0 and T0 from the main power supplies R, S, and
T. Keep the connector connected if you do not supply power
to the control power supply with a different system.
• The power supply input path is
disconnected.
• 200V power is supplied to R0
and T0 for 400V class.
• The breaker or wires may be disconnected. You need to
re-examine the wiring.
• When different power is supplied to the control power
supplies R0 and T0, you also need to re-examine R0 and
T0.
• The issue will be solved by remounting the operator keypad.
• Operator keypad is about to
come off.