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Risk of electric shock
The insulation of the temperature sensors for the winding monitoring with respect to the
winding is implemented according to the requirements for basic insulation. The temperature
sensor connections are located in terminal boxes, safe to touch - and have no protective
separation. This is the reason that in the case of a fault, a hazardous voltage can be present
at the measuring sensor cable. When touched, this can result in death, severe bodily injury
and material damage.
● When connecting the temperature sensor to external temperature monitoring devices,
6.5.4
Internal equipotential bonding in the auxiliary terminal box
The equipotential bonding between the PE terminals in the relevant auxiliary terminal box
enclosure and the machine enclosure is established via a fixing bolt in each auxiliary terminal
box enclosure. The contact point underneath the bolt head is bare metal and protected against
corrosion.
Ineffective equipotential bonding
If the equipotential bonding connection fails, parts of the machine may become live. If you
touch them, you will receive an electric shock. This can result in death, serious injury or
material damage.
● When performing any installation work you must always take care to ensure that all
SIMOTICS T-1FW4 Heavy Duty 1FW4407-1KM81-1BC0-Z
Operating Instructions 11/2018
WARNING
when required, apply additional measures to fully comply with the requirements set out in
IEC 60664-1 or IEC 61800-5-1 "Hazard due to electric shock".
WARNING
equipotential bonding connections remain effective.
Electrical connection
6.5 Connecting the auxiliary circuits
61
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