Caution Signs - Hitachi 650 Series Operation Manual

Section 2
Safety information
2.3

Caution signs

12
Always connect the IED to protective earth, regardless of the operating conditions. This
also applies to special occasions such as bench testing, demonstrations and off-site
configuration. This is class 1 equipment that shall be earthed.
Never disconnect the secondary connection of current transformer circuit without short-
circuiting the transformer's secondary winding. Operating a current transformer with the
secondary winding open will cause a massive potential build-up that may damage the
transformer and may cause injuries to humans.
Never remove any screw from a powered IED or from a IED connected to powered
circuitry. Potentially lethal voltages and currents are present.
Take adequate measures to protect the eyes. Never look into the laser beam.
The IED with accessories should be mounted in a cubicle in a restricted access area
within a power station, station or industrial or retail environment.
Whenever changes are made in the IED, measures should be taken to avoid inadvertent
tripping.
The IED contains components which are sensitive to electrostatic discharge. ESD
precautions shall always be observed prior to touching components.
Always transport PCBs (modules) using certified conductive bags.
Do not connect live wires to the IED. Internal circuitry may be damaged
Always use a conductive wrist strap connected to protective earth when replacing
modules. Electrostatic discharge (ESD) may damage the module and IED circuitry.
Take care to avoid electrical shock during installation and commissioning.
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650 series
Operation manual