S.1 Safe Work
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S.1.4
Rules for Operating or Checking the Electrical Devices
(1) All operating and checking jobs must be carried out by persons with appropriate special qualifications
(e.g., duly trained persons or electrical experts).
(2) Always turn off the main switch before opening the control box.
(3) After turning off the main switch, be sure to put up the warning tag "NEVER switch on" on the main
switch.
(4) Handle an electrical component or part only when no power is supplied to it. Note that the primary side
terminals of the main switch are applied with a voltage even when it is turned off.
(5) Voltage application may be needed for checking control system functions. Be especially careful when
conducting such a job.
(6) Use the measuring devices and tools, all kept in proper condition.
(7) When connecting the power supply to the loom, always connect the protective wire (green or yellow/
green spiral) first to the PE terminal. For disconnection, be sure to disconnect the protective wire last of
all.
(8) During electrical installation work, the observer responsible for security of the workers must absolutely,
without fail, attend at the field. The observer should be limited to someone with know-how concerning
electrical troubles.
(9) Never try to modify an electrical unit or device because it may cause a malfunction or accident. If it is
inevitable, please consult with us.
Even after the main switch (main circuit breaker CB1) on the control box is turned off, the group-
control inverter power is fed to the terminal board (TB3) and the primary side of the magnet
switch (MSI). Take extra care.
Optional SC inverter power will be cut off if you turn off the main switch (CB1).
