15
IMPORTANT SAFETY NOTICE!
To avoid accidents, the following must be observed:
When the FRAKO panel-mounting instrument is fitted in the front of a control
cabinet for its intended use, there is a danger that its four retaining screws
could become live and therefore a safety hazard if there is a fault in the wiring
adjacent to the instrument. If a wire at a dangerous voltage works loose, it
could make electrical contact with one of the four retaining screws. This means
that it cannot be excluded that the head of the screw, which can be touched
from outside the cabinet, could become live. In rare cases this could constitute
a danger to life and limb.
At the location where the FRAKO panel-mounting instrument is installed (e.g.
control cabinet, enclosure), all wires and cables must be securely fastened or
grouped in harnesses to ensure that any stray wire or strand cannot contact
one or more of the instrument's retaining screws, thus making it or them live
and therefore dangerous.
If the above safety precautions are taken, the risk of damaging equipment and
assets or endangering life and limb can be significantly reduced.
5 Installation
5.1 Electrical connections
The instrument is connected as shown in the diagrams in
[Section 5.4]
.
DANGER!
The following instructions must be observed to avoid danger to life and limb:
- When the instrument is being installed or serviced, the instrument and the
electrical system must be isolated from the power supply.
- The isolated electrical system must be locked out to prevent its being
inadvertently switched on again.
- It must be verified that none of the terminals are live!
- The earthing tab must always be the first connection that is made
(see Section 5.2, Earth connection)
.
- The power supply and voltage measurement terminals are live and must not
be touched (risk of electric shock)!
- The measurement terminals L1, L2, L3 and N, the AUX power supply terminals
and both alarm contacts must be short-circuited during any work carried out
on the instrument.
- All live components in the vicinity must be covered to prevent inadvertent
contact.
- If the power supply voltage and the voltage measured exceed the values
specified in this operating manual and stated on the instrument, this may
cause damage to the PQC. Consequential damage to other parts of the
installation is also possible.
- The instrument power supply circuit AUX must be protected externally by
a 2 A slow-blow 250 V AC fuse. One such fuse is required when the power is
from an L–N connection, but two fuses must be installed if an L–L connection
is used.
- A disconnecting device must be installed so that the connections of the PQC
can be isolated from the electrical system and building electrical installations.
